loss of drive power – California Lemon Law blog

Owners of certain 2021–2023 Ford Mustang Mach-E vehicles should be aware of a newly identified drivetrain defect that could lead to a sudden loss of power or unexpected vehicle movement. While no crashes or injuries have been linked to the issue so far, the potential safety risks have prompted Ford to launch a safety campaign affecting vehicles equipped with a rear-wheel-drive (RWD) drivetrain.

What Is the Problem?

According to Ford, the issue involves the rear differential pinion shaft, a critical component inside the rear differential assembly. Engineers have determined that some pinion shafts can develop bending fatigue, eventually causing the shaft to fracture. If this happens while driving, the vehicle could experience a loss of motive power, leaving the driver without propulsion. In some cases, if the vehicle is placed in Park without the parking brake being applied, it could also experience unintended vehicle movement, increasing the risk of a collision.

Warning Signs

Before a failure occurs, some drivers may notice a Malfunction Indicator Light (MIL) illuminated on the dashboard. Diagnostic trouble codes that may be associated with this condition include:

P174E
P0A2F
P019C
P27B2

While these warning codes do not necessarily mean the differential has failed, they may indicate that the vehicle should be inspected promptly.

How Ford Discovered the Defect

The investigation began in March 2026 after Ford engineers analyzed a failed rear differential recovered from a 2023 Mustang Mach-E in Europe. During the tear down, engineers identified a fractured pinion shaft. As the investigation expanded, Ford analyzed additional failed components returned under warranty and discovered a consistent pattern of bending fatigue failures. Engineers also found evidence that similar failures had been observed by the differential supplier during earlier analyses in 2025.

The investigation uncovered inconsistencies in the hardness measurements of some pinion shafts, although Ford states that the precise root cause is still under investigation.

By June 2026, Ford had identified:

62 warranty claims
14 Global Common Quality Indicator System (GCQIS) reports
4 customer reports through the Global Contact Center
2 European White Alert reports

Ford reports that it is not aware of any accidents, injuries, or fires related to this condition.

What Owners Should Expect

Ford dealers will inspect and repair or replace the rear differential assembly as necessary.

Because the final repair procedure is still being finalized, Ford plans to notify owners in two stages:

July 13, 2026: Interim notification letters explaining the safety concern.
Late December 2026 (anticipated): Follow-up letters when the permanent repair becomes available.

Vehicle Information

This safety campaign affects certain 2021–2023 Ford Mustang Mach-E vehicles equipped with a rear-wheel-drive (RWD) drivetrain.

Ford has assigned this campaign 26S50, while the National Highway Traffic Safety Administration (NHTSA) has identified it as Campaign No. 26V-417.

Final Thoughts

Although reports of actual failures remain relatively uncommon compared to the number of vehicles on the road, a fractured rear differential pinion shaft has the potential to disable the vehicle or allow unintended movement under certain circumstances. Owners of affected Mustang Mach-E models should watch for notification letters from Ford and arrange for the recommended service as soon as parts and repair procedures become available.

Owners of certain Jeep Cherokee vehicles may be facing a serious drivetrain issue that could lead to sudden loss of power while driving. Chrysler parent company FCA US LLC has officially recalled certain 2019–2023 Jeep Cherokee models due to potential failure of the Power Transfer Unit (PTU).

The issue has been under investigation for years and has now resulted in multiple recalls, government inquiries, warranty claims, and at least one reported accident and injury.

What Is the Jeep Cherokee PTU Problem?

According to FCA, some 2019–2023 Jeep Cherokee vehicles were built with a two-speed Power Transfer Unit (PTU) that may fail internally. The PTU is a critical drivetrain component used in four-wheel-drive systems. When the PTU fails, it can cause:

Sudden and unrecoverable loss of motive power
Vehicle rolling while in PARK
Unexpected drivability problems at any speed

FCA warns that these failures can occur without warning and may increase the risk of a crash or injury.

Symptoms of a Failing PTU

Drivers may notice warning signs before complete failure occurs. FCA says symptoms can include:

Service 4WD Warning Message: A “Service 4WD” message may appear on the dashboard.
Noise or Vibration: Some owners report grinding noises, vibration, or unusual drivetrain sounds.
Changes in Drive Quality: Drivers may notice hesitation, jerking, binding, or inconsistent power delivery.

However, FCA also warns that some failures may happen suddenly without significant warning.

The suspect production period began on December 12, 2018 and continued through February 24, 2023.

Vehicles outside the recall population may:

Use a different PTU design
Not have a PTU installed
Have been manufactured before the suspect period

A Problem Years in the Making

The PTU issue did not appear overnight. FCA and government safety agencies have been investigating similar Jeep Cherokee drivetrain failures for years.

Recall History Timeline

The Jeep Cherokee PTU issue has been developing for several years through multiple recalls and investigations. In June 2020, FCA issued Recall W47 (NHTSA 20V-343) for certain 2014–2017 Jeep Cherokee vehicles due to PTU input spline failures. The problem expanded in April 2023 when FCA launched Recall 45A (NHTSA 23V-302), adding more 2016–2017 models to the recall population. In January 2025, FCA issued Recall 01C (NHTSA 25V-011) for certain 2017–2019 Jeep Cherokees involving improperly seated PTU snap rings that could also lead to drivetrain failure. By January 2026, FCA had opened yet another investigation into PTU failures affecting 2019–2023 Jeep Cherokee vehicles, further widening concerns surrounding the reliability and safety of the PTU system.

FCA launched another investigation into PTU failures affecting 2019–2023 Jeep Cherokee vehicles.

By April 2026, FCA reported:

387 warranty claims
9 customer assistance records
5 field reports
16 service records
1 reported accident
1 reported injury

On April 30, 2026, FCA officially determined that a safety defect exists in certain affected vehicles.

Recall Information

The current recall identifiers are:

FCA Recall Number: 40D
NHTSA Campaign Number: 26V-290

At this time, the final repair solution is still under development. FCA says interim owner notification letters are expected to be mailed beginning June 25, 2026. Additional notices will be sent once a permanent remedy becomes available.

What Should Jeep Cherokee Owners Do?

If you own a 2019–2023 Jeep Cherokee, especially a four-wheel-drive model, it may be wise to:

Watch for warning lights or drivetrain symptoms.
Do Not ignoring vibration or unusual noises.

Because the defect can potentially cause sudden loss of motive power or vehicle movement while parked, owners should take any PTU-related symptoms seriously.

Final Thoughts

The Jeep Cherokee PTU issue has evolved from isolated drivetrain complaints into a major multi-year safety investigation involving NHTSA, and FCA US. With hundreds of reported incidents and multiple recall expansions over several model years, affected owners should stay informed and monitor recall updates closely as FCA develops a final repair solution.

Owners of certain 2021-2025 Ford Bronco SUVs should be aware of a newly announced safety defect affecting the vehicle’s powertrain. Identified under NHTSA Campaign Number 26V-236, this issue impacts approximately 4,922 vehicles and centers around a potentially serious problem with the connection between the transmission and transfer case.

What’s the Problem?

The recall stems from a misalignment that can occur during previous service repairs involving the transmission or transfer case. If these components are not properly aligned when reassembled, it can lead to premature wear of critical internal splines, specifically the transmission output shaft splines and transfer case input splines.

Over time, this wear can reduce the ability of these parts to properly transfer power from the engine to the wheels.

Why This Matters

If the spline wear becomes severe, drivers may experience:

Loss of motive power while driving
Failure of the vehicle to properly engage “Park”
Vehicle rollaway if the parking brake is not applied

These conditions significantly increase the risk of a crash, particularly if the issue occurs unexpectedly while driving or when the vehicle is parked on an incline.

Warning Signs to Watch For

Ford notes that affected drivers may notice early warning symptoms before a failure occurs, including:

Grinding noises
Clunking sounds
Unusual vibrations

If you’re experiencing any of these issues—especially after recent drivetrain service—it’s worth getting your vehicle checked immediately.

How Ford Discovered the Issue

Ford first flagged the problem in November 2025 after reviewing warranty claims on 2022–2023 Bronco models reporting noise, vibration, and drive engagement failures. By December, the issue was escalated internally, and a deeper investigation revealed similar cases across 2021-2025 models.

Engineers ultimately determined that improper alignment during past repairs was the root cause. Testing confirmed that even slight misalignment could reproduce the same wear patterns seen in failed components.

To address this, Ford updated its service procedures on February 26, 2026 to ensure proper alignment during repairs going forward.

How Many Vehicles Are Affected?

While nearly 5,000 vehicles in the U.S. had undergone relevant repairs prior to the updated procedures, only a small number of confirmed cases have been reported so far 26 vehicles globally as of March 2026.

What’s the Fix?

Dealers will:

Inspect the transmission-to-transfer case joint
Replace the transmission and/or transfer case if necessary

Recall Timeline

April 27, 2026: Interim notification letters sent to owners
July 2026 (anticipated): Final remedy available and follow-up letters sent

Ford has assigned this recall the internal number 26S26.

What Should You Do?

If you own a 2021–2025 Bronco:

Watch your mail for official recall notifications
Pay attention to any unusual drivetrain noises or behavior
Always use your parking brake when parked (especially on inclines)
Contact your local Ford dealer if you have concerns

Final Thoughts

This recall highlights how even routine service work can introduce issues if not performed precisely—especially in complex drivetrain systems. While the number of confirmed cases is relatively small, the potential safety risks make this an important issue for Bronco owners to take seriously.

Mercedes-Benz has determined that there is a safety defect affecting over 24,000 Mercedes-Benz vehicles. The problem is related to an issue with the drive shaft universal joint. This part plays a critical role in how power is delivered to your wheels, and when it fails, the consequences can be serious.

What Vehicles Are Affected?

This recall (NHTSA Campaign Number: 26V-216) applies to select 2018–2020 Mercedes-Benz 4MATIC models, including:

E-Class (Sedan, Wagon, Coupe, Cabriolet)
S-Class (Sedan, Coupe, Convertible)
Maybach S 560 4MATIC

Specifically, models like the E 400, E 450, S 450, S 560, and Maybach S 560 are included.

What’s the Problem?

Mercedes-Benz has identified that increased wear may occur in the universal joint (U-joint) on the drive shaft. This is due to insufficient production parameters from a supplier, which can lead to premature degradation over time.

The real issue begins when:

The U-joint loses lubrication.
Wear accelerates.
The joint can fracture under load.

At that point, the connection between the transfer case and front axle transmission may fail entirely.

Why This Matters (Safety Risk)

If the universal joint fails, the vehicle can experience a sudden loss of propulsion—meaning it may stop delivering power to the wheels without warning.

That creates a dangerous situation:

Loss of acceleration in traffic.
Reduced ability to maneuver.
Increased risk of a crash.

Mercedes-Benz notes that while some warning signs may appear, they are not guaranteed to be noticed before failure.

Warning Signs to Watch For

In some cases, drivers may notice early symptoms such as:

Unusual noises from underneath the vehicle.
Vibrations while driving, especially under acceleration.

However, these signs can be subtle—or completely absent—making this issue particularly concerning.

What Caused the Issue?

The root cause traces back to a supplier manufacturing process that did not meet optimal parameters. Over time, this can result in:

Improper wear patterns.
Reduced durability of the U-joint.
Increased likelihood of failure under normal driving conditions.

What Mercedes-Benz Will Do

Mercedes-Benz dealers will:

Inspect the drive shaft.
Replace it if necessary.
Perform all repairs free of charge.

This recall highlights how even a single component failure within the drivetrain can have major safety implications. If your vehicle is affected, it is worth addressing promptly—even if you have not noticed any symptoms. A quiet drivetrain today does not guarantee it will stay that way tomorrow. Owner notification letters are scheduled to be mailed beginning June 2, 2026.

(Recall: SB-25-16-005 / NHTSA Campaign 25V-690)

If you own or are considering buying a 2025 Model 3 or 2026 Model Y from Tesla, there’s a safety issue you should know about. Certain vehicles built between early March and mid-August 2025 are affected by a battery pack contactor fault that may result in an unexpected loss of drive power. This article explains what the issue is, which vehicles are affected, what the risks are, and what owners should do next.

What is the issue?

Tesla has determined that certain 2025 Model 3 and 2026 Model Y vehicles are equipped with a battery pack contactor manufactured with an InTiCa solenoid that may have a poor coil termination connection.

If the contactor opens unexpectedly while the vehicle is in drive, the driver loses the ability to apply torque through the accelerator pedal, resulting in a loss of propulsion. This sudden loss of drive power could increase the risk of a collision.

There is no warning prior to the failure. However, when it occurs, the driver receives an immediate visual alert on the user interface instructing them to safely pull over.

Which vehicles are affected?

2025 Tesla Model 3 vehicles manufactured between March 8 and August 12, 2025.
2026 Tesla Model Y vehicles manufactured between March 15 and August 15, 2025.

Tesla estimates roughly 13,000 vehicles in total are affected, including around 5,000 Model 3s and nearly 8,000 Model Ys produced within those date ranges.

Timeline of Investigation & Recall

August 8, 2025: Tesla’s Field Reliability team began investigating service cases where vehicles were unable to enter drive and high coil resistance was detected in the pack contactor.
August 8 – September 26, 2025: Tesla collected contactors from the field and performed detailed failure analysis.
September 29 – October 2, 2025: Tesla reviewed the failure analysis results, along with repair and production records.
October 3, 2025: Tesla completed its investigation and determined the scope of affected vehicles, initiating a voluntary recall.
December 9, 2025: Owner notification letters are expected to be mailed to customers.

As of early October 2025, Tesla had identified 36 warranty claims and 26 field reports related to this issue, with no known injuries, collisions, or fatalities.

What is the remedy?

Tesla Service will correct the problem by replacing the high-voltage battery pack contactor. The updated parts do not include the defective InTiCa solenoid and have improved coil termination connections. The repair takes approximately one hour to complete, and Tesla will notify all affected owners by mail.

Why this matters

Safety risk

A sudden loss of propulsion without warning can be dangerous, especially when driving at highway speeds or in traffic. While no injuries have been reported, Tesla’s recall emphasizes the importance of addressing this issue promptly.

Financial and resale considerations

Unresolved recalls can affect resale value, financing, and insurance. Ensuring the recall repair is completed not only improves safety but also helps preserve the vehicle’s long-term value.

What owners should do if their Tesla vehicle is affected.

Schedule a service appointment through the Tesla app or by contacting your nearest Tesla Service Center.
Pay attention to alerts while driving. If a visual warning or loss of power occurs, pull over safely and contact Tesla support immediately.
Keep documentation of the recall repair for future reference or resale.
If buying used, confirm with the seller that any open recalls have been completed.

This recall serves as a reminder that even advanced electric vehicles like Tesla are not immune to hardware issues. While Tesla can often fix software defects through over-the-air updates, mechanical components such as contactors and solenoids require physical inspection and replacement.

Frequently Asked Questions

Q: Does this recall affect all 2025 Model 3 and 2026 Model Y vehicles?
A: No. Only vehicles built between March and August 2025 with the affected InTiCa solenoid contactor are included.

Q: My car feels fine — do I still need the repair?
A: Yes. The failure can occur without warning, so even if your car shows no symptoms, Tesla recommends completing the replacement.

Q: How long will the repair take?
A: The contactor replacement typically takes about one hour and is performed free of charge.

Q: Can I continue driving before the repair?
A: Tesla advises that owners continue driving normally but schedule service as soon as possible. If your vehicle shows a propulsion loss alert, pull over safely and contact Tesla.

Conclusion

If you drive a 2025 Tesla Model 3 or 2026 Model Y, this recall deserves your attention. The contactor defect can cause sudden loss of drive power, posing a potential safety risk. Tesla is replacing the affected parts at no cost to owners, with notifications beginning December 2025.

Fiat Chrysler Automobiles (FCA US LLC) has identified a serious issue affecting certain 2022–2026 Jeep Grand Cherokee Plug-In Hybrid Electric (PHEV) vehicles. A software error within the Hybrid Control Processor (HCP) can result in a sudden loss of drive power, creating potential safety risks for drivers and passengers.

What’s the Problem?

The issue stems from the Battery Pack Control Module (BPCM) microprocessor. In some vehicles, the microprocessor may become overloaded and reset. During specific reset events, the HCP may misinterpret signals from the BPCM, causing the system to incorrectly shut down propulsion.

This defect could lead to a loss of drive power while operating, increasing the risk of a crash if drivers are unable to maintain control of their vehicles.

When Were the Vehicles Built?

The suspect period began on July 23, 2021, when the faulty HCP software was introduced into production, and ended on August 29, 2025, when FCA placed affected vehicles under plant control. Engineering records and assembly plant data were used to define this production window.

Chronology of Events

The chronology of events surrounding the discovery of the software problem in certain 2022–2026 Jeep Grand Cherokee Plug-In Hybrid Electric (PHEV) vehicles began on May 1, 2025, when FCA US LLC received a Preliminary Information Request from NHTSA’s Office of Defect Investigations, followed by FCA’s response on May 23, 2025. A supplemental request from NHTSA arrived on June 23, 2025, with FCA responding on July 14, 2025. Meanwhile, on June 24, 2025, FCA’s Technical Safety and Regulatory Compliance (TSRC) team opened an investigation into loss of propulsion complaints in Jeep Grand Cherokee PHEVs. Between June and August 2025, FCA US TSRC worked with FCA US Engineering to review the issue, analyze possible failure modes, and identify the suspect vehicle population. By August 18, 2025, FCA had recorded 96 customer assistance records, 110 field reports, and 320 service records related to the issue, though no accidents or injuries had been reported. Finally, on August 28, 2025, FCA’s Vehicle Regulations Committee concluded that a defect affecting motor vehicle safety potentially exists in all affected vehicles.

Recall Information

Chrysler Recall Number: 73C
NHTSA Campaign Number: 25V-576
Affected Vehicles: Certain 2022–2026 Jeep Grand Cherokee Plug-In Hybrid Electric (PHEV)

At this time, the remedy is still under development. FCA US expects to begin mailing owner notification letters on October 23, 2025.

Final Thoughts

The Jeep Grand Cherokee PHEV recall highlights the challenges of integrating advanced hybrid technology with complex vehicle software systems. While no accidents or injuries have been reported, the risk of propulsion loss makes this a critical safety concern.

Owners are encouraged to stay informed, act quickly once notifications arrive, and ensure their vehicles are repaired as soon as the remedy becomes available.

The National Highway Traffic Safety Administration (NHTSA) has launched an investigation into certain Ford Bronco and Maverick vehicles due to concerns with their electrical systems. The Office of Defects Investigation (ODI) opened a Preliminary Evaluation in January 2024 to investigate allegations of loss of motive power in model year 2021 Ford Bronco Sport vehicles.

What’s Happening?

In April 2024, Ford issued a safety recall (24V-267) covering 456,565 model year 2021-2024 Ford Bronco Sport and model year 2022-2023 Ford Maverick vehicles. The recall addressed occurrences of loss of motive power resulting from sudden degradation of the 12V battery during the drive cycle. When the battery failure occurs, consumers may experience a complete loss of engine power without the ability to restart, accompanied by the loss of 12V accessories, including hazard lights.

The Remedy

The recall remedy consists of software updates to the body control module and powertrain control module, which were designed to provide improved detection of the 12V battery state of charge during the drive cycle and provide warning to consumers if the battery is degraded.

New Concerns Arise

Despite the recall, the ODI has since received 15 reports from vehicle owners describing loss of motive power incidents for model year 2021 Ford Bronco Sport vehicles that received the 24V-267 recall remedy. Consumers describe that prior to the loss of motive power, there were no warnings related to the 12V battery or vehicle electrical system. Additionally, multiple consumers reported that after the vehicle was towed to the dealership following the loss of motive power, the event was diagnosed to the 12V battery, and a battery replacement was the only required repair.

What’s Being Done About It?

The NHTSA has opened an investigation (RQ24014) to further examine this issue. The agency will review the data and determine if additional action is necessary to ensure public safety.

What to Do Next

If you own one of these vehicles and have experienced a loss of motive power, it’s crucial to:

File a report : Share your experience with the NHTSA by submitting a complaint on their website.
Stay informed : Keep an eye on this investigation and any updates from the manufacturer or the NHTSA.

Your safety is paramount, and staying proactive can help prevent potential electrical system failures and keep you safe on the road.

Key Facts

Affected Vehicles: Certain Ford Bronco and Maverick models (2021-2024 Ford Bronco Sport and 2022-2023 Ford Maverick)
Component: Electrical System
NHTSA Action Number: RQ24014
Opened From: November 15, 2024–Present

Low Oil Pressure Warning Ford Motor Company have identified a critical issue in certain 2024-2025 F-150, 2024 Expedition, and 2024 Lincoln Navigator vehicles equipped with the 3.5L GTDI engine. A misaligned engine cup plug has been found to potentially result in a rapid oil leak, posing serious safety risks.

The Problem: Misaligned Engine Cup Plug

The defect stems from a misalignment of the hydraulic press used to insert engine cup plugs into the cylinder head bore during assembly. This misalignment, approximately 1.5 mm off center, distorts the cup plug, reducing its retention within the bore. This defect may result in:

Rapid Oil Leak: A misaligned plug can cause sudden, large-volume oil loss.
Increased Fire Risk: Oil leaks in the presence of hot engine or exhaust components may lead to a fire.
Loss of Motive Power: A sudden loss of oil can result in reduced engine performance or a complete loss of motive power, increasing the risk of a crash.

Warning Signs for Customers

Drivers of affected vehicles may notice several warning signs, including:

Low Oil Pressure Warning: A warning light on the instrument cluster.
Burning Smell or Smoke: White smoke or a burning odor from the engine compartment.
Oil Leak or Engine Noise: Visible oil leakage or unusual noises from the engine.

Discovery and Investigation

The issue first came to Ford’s attention in October 2024 during a vehicle evaluation at the Kansas City Assembly Plant. A 2024 F-150 equipped with the 3.5L GTDI engine experienced a significant oil leak caused by the expulsion of a 13mm engine cup plug on the exhaust side.

Ford’s Critical Concern Review Group (CCRG) conducted an investigation and tear down analysis. They found no damage to the cylinder head bore but discovered that the cup plug was off center. The misalignment was traced back to maintenance work on the cylinder head assembly line at the Cleveland Engine Plant between September 9, 2024, and September 16, 2024. Other stations were confirmed to have proper alignment.

Field Action and Customer Notification

As of October 30, 2024, Ford has not received any warranty claims or field reports from customers regarding this issue. However, the company is taking measures to ensure customer safety:

Field Action Approval: Ford’s Field Review Committee approved the recall on November 1, 2024.
Dealer Inspections and Repairs: Dealers will inspect the cup plug alignment and replace any misaligned plugs.
Customer Notifications: Owner notification letters are scheduled to be mailed by December 2, 2024.

Recall Details

Ford Recall Number: 24S70
NHTSA Campaign Number: 24V-851

Next Steps for Vehicle Owners

Ford advises owners of the affected 2024-2025 F-150, 2024 Expedition, and 2024 Lincoln Navigator vehicles to monitor for any signs of the defect and to schedule an inspection with their dealer once notified. This precautionary recall aims to address the issue and ensure vehicle safety and reliability.