Acura – California Lemon Law blog

The National Highway Traffic Safety Administration (NHTSA) has expanded its investigation into reports of brake system failures affecting numerous General Motors vehicles, along with certain Honda and Acura models built by GM. The investigation, now designated Engineering Analysis EA26006, focuses on reports of a sudden loss of brake assist that could increase stopping distances and the risk of a crash.

What Is the Issue?

The investigation began after owners of 2023 Cadillac Lyriq vehicles reported experiencing:

A hard brake pedal
“Brake System Failure” warning messages
Loss of brake assist during startup or while driving

According to GM, some failures may be caused by an internal fracture in the vehicle’s electronic eBoost brake system. The company says drivers should receive warning messages and that the vehicle may limit its speed to approximately 70 km/h (43 mph).

However, NHTSA has continued receiving reports suggesting some vehicles lose brake assist immediately during braking, rather than only after coming to a stop. If true, this could significantly increase stopping distance in an emergency.

Vehicles Included

The investigation now includes numerous models equipped with the same eBoost braking system, including:

Cadillac Lyriq, Celestiq, and Optiq
Buick Enclave and Envision
Chevrolet Colorado, Blazer EV, Equinox EV, and Traverse
GMC Canyon and Acadia
Honda Prologue
Acura ZDX

What Does This Mean?

An Engineering Analysis is one of the final stages before NHTSA decides whether a safety recall may be necessary. Investigators will continue reviewing complaints, engineering data, and failed components to determine whether the braking system presents a safety defect.

What Should Owners Do?

If your vehicle displays brake system warnings or you notice a hard brake pedal or reduced braking performance, have it inspected promptly and keep copies of all repair records. Repeated brake-related repairs may qualify for relief under your state’s lemon law if the manufacturer cannot successfully fix the problem. Depending on your state’s laws, you may be entitled to a vehicle buyback, replacement, or other compensation.

The National Highway Traffic Safety Administration (NHTSA) has closed a petition requesting a formal safety investigation into reports of all-wheel drive (AWD) failures affecting certain Acura TLX and MDX vehicles. While the agency acknowledged that the reported mechanical failure is real, it concluded there is currently insufficient evidence to classify it as a safety-related defect requiring a formal investigation or recall.

Which Vehicles Are Affected?

The petition involved:

2021–2023 Acura TLX equipped with Super Handling All-Wheel Drive (SH-AWD)
2022–2023 Acura MDX equipped with SH-AWD

According to the petition, a mechanical failure inside the drivetrain can prevent power from being sent to the rear wheels, effectively turning the vehicle into front-wheel drive only.

What Is Failing?

The reported issue involves the splined connection between the front transaxle and the Power Take-Off Unit (PTU). Over time, these splines can shear or strip, permanently disconnecting the rear drivetrain.

When this happens:

The vehicle loses all rear-wheel drive capability.
Power is sent only to the front wheels.
The failure is permanent until repaired.

Interestingly, many owners reportedly did not realize anything had failed until driving on snow, ice, or another slippery surface where AWD traction would normally be expected.

Why Did Owners Want an Investigation?

The petition argued that losing AWD could reduce directional control and create a safety risk, particularly in poor weather conditions. The concern was heightened because Acura’s SH-AWD information display may continue to indicate that torque is being delivered to the rear wheels—even after the mechanical connection has completely failed. In other words, drivers may believe their AWD system is functioning normally when it is not.

What Did NHTSA Find?

NHTSA’s Office of Defects Investigation reviewed:

62 consumer complaints (Vehicle Owner Questionnaires)
Manufacturer field reports
Technical information about the SH-AWD system

The agency confirmed that the spline failure does occur and results in the permanent loss of torque to the rear axle.

However, investigators also found:

The vehicles continue to operate normally as front-wheel drive vehicles.
There is no loss of engine power.
Vehicle Stability Assist (VSA) and traction control remain fully operational.
The steering and braking systems continue to function normally.

Most importantly, NHTSA found no evidence that the failure causes drivers to lose control of the vehicle.

Why Was the Petition Denied?

NHTSA determined that Acura’s SH-AWD system is primarily a performance-enhancing feature rather than a critical stability system. Unlike some traditional AWD systems that are necessary for maintaining mobility after drivetrain failures, these Acura models are fundamentally designed as front-wheel drive vehicles. Because of that, the agency concluded that losing rear-wheel drive affects vehicle performance rather than basic vehicle safety.

The investigation also found:

No reported crashes linked to the failure.
No reports of loss of motive power.
No documented injuries resulting from the condition.

Without evidence that the defect creates an unreasonable safety risk, NHTSA declined to open a formal defect investigation.

Does This Mean There Isn’t a Problem?

Not necessarily. NHTSA specifically stated that closing the petition does not mean a safety defect does not exist. Instead, it means the agency currently lacks sufficient evidence that the issue presents an unreasonable safety risk under federal safety standards. The agency also noted that it may reopen the matter if future complaints, crashes, or additional evidence emerge.

What Should Acura Owners Do?

If you own one of the affected Acura models, it is worth paying attention to any changes in how your vehicle performs, particularly during wet, snowy, or icy driving conditions.

Potential warning signs may include:

Reduced traction on slippery roads
Difficulty accelerating in snow
Unexpected front-wheel spin
Service messages related to the AWD system

Because the SH-AWD display may continue to indicate normal operation even after the drivetrain has failed, routine inspections by a qualified technician may be the only way to identify the problem before winter driving exposes it.

The Bottom Line

The reported SH-AWD spline failure is a genuine mechanical issue that can disable the rear-wheel drive system in certain Acura TLX and MDX models. However, after reviewing dozens of owner complaints and technical evidence, NHTSA concluded there is not enough evidence to show that the condition creates an unreasonable safety risk warranting a formal defect investigation.

For now, no recall has been issued, but the issue remains on NHTSA’s radar. Owners experiencing AWD performance problems should have their vehicle inspected promptly and consider reporting the issue to NHTSA, as additional reports could influence future agency action.

Owners of certain 2016–2020 Acura ILX vehicles may be experiencing an unsettling brake issue that develops quietly over time. While it does not always appear suddenly or trigger warning lights, the condition can reduce brake effectiveness during everyday driving—particularly during gentle or slow brake applications. For drivers, any issue involving braking deserves close attention.

What Is the Brake Problem?

The issue centers on the brake master cylinder, a critical component responsible for converting pedal pressure into braking force. In the affected vehicles, a material used in the brake fluid reservoir hose can release excess plasticizer into the brake fluid.

Over time, this contamination causes a seal inside the master cylinder (known as the secondary cup seal) to swell and deform. Heat from the engine can make the problem worse.

When this happens:

Brake fluid can bypass the seal instead of building proper pressure
The brake pedal may feel softer or less firm
Stopping distances may increase, especially during light or gradual braking

In real-world driving, this means the vehicle may not slow down as expected—raising the risk of a crash or injury.

Why Did This Happen?

The root cause traces back to manufacturing timing. The brake reservoir hose was installed too soon after production, before excess plasticizer had time to dissipate. That plasticizer leached into the brake fluid, which was then absorbed by the master cylinder seal.

As the seal absorbed the contaminant and expanded:

Its shape and flexibility changed
It could no longer maintain a proper seal under certain braking conditions
Brake fluid was allowed to leak back into the reservoir

The result is reduced hydraulic pressure when the driver presses the brake pedal slowly.

A Long Investigation Timeline

Honda and Acura engineers spent nearly a decade analyzing this issue:

2015–2021: Initial complaints of intermittent brake pedal pressure loss
2022–2024: Extensive testing confirmed chemical contamination and seal swelling
2025: A clear link was found between hose storage timing, material curing, and seal deformation

By late 2025, the manufacturer determined that this condition posed a motor vehicle safety defect and initiated corrective action.

As of December 2025, there were 192 warranty claims associated with the issue. Fortunately, no injuries or fatalities have been reported.

What Is Being Done to Fix It?

Owners of affected vehicles will be notified by mail and instructed to visit an authorized Acura dealer. The repair involves:

Replacing the brake master cylinder
Installing an improved sealing cup made from a different material
Restoring proper brake fluid sealing and pedal feel

This updated design is intended to eliminate the contamination-related swelling entirely.

Why This Matters for Lemon Law Claims

Even if a manufacturer offers a fix, brake-related defects can still be relevant under Lemon Law statutes, especially if:

The problem existed during the warranty period.
You experienced repeated brake complaints or repairs.
The issue affected vehicle safety, drivability, or value.

Certain 2025 Acura RDX vehicles may have a problem with the electric power steering (EPS) system software. The software may not be properly calibrated, which can cause the EPS system to enter fail-safe mode and result in a sudden loss of power steering assist.

This issue can make steering more difficult, especially at lower speeds, increasing the risk of a crash.

What Causes the Power Steering Problem

During the development of the 2025 Acura RDX EPS software to meet California Idle Stop OBD requirements, Honda’s Tier 2 supplier mistakenly set the EPS target returnability Integrated Dynamics System (IDS) gain to an incorrect value.

This mis-calibration can trigger the problem under specific conditions:

When the driver makes a sharp steering input during a turn
When IDS is in Comfort mode
When the Lane Keeping Assist System (LKAS) is active

In these scenarios, the EPS target returnability output may exceed the system’s safety threshold, causing the system to falsely detect a fault and enter fail-safe mode—cutting off power steering assist.

Timeline of Discovery

October 2024: Honda received the first complaint and began investigating.
March 2025: Investigation efforts continued with further analysis.
May 29, 2025: A dealership review revealed that the customer’s driving mode could be a factor.
July 2025: Honda and its supplier continued in-depth testing and analysis.
August 19, 2025: Honda determined the issue could present a safety risk.
August 28, 2025: Honda confirmed a safety defect and announced a recall.

Between August 2024 and August 2025, Honda received 84 warranty claims related to the issue but reported no injuries or deaths.

The Fix

Honda dealers will reprogram the EPS software on affected Acura RDX vehicles.

Owner notification letters will be mailed starting October 20, 2025.
Honda Recall Number: GMS
NHTSA Campaign Number: 25V-582

The fuel filler neck and fuel tank junction in a small number of 2021-2023 Acura TLX vehicles may have an incomplete weld that could separate. An incomplete weld can cause separation, leading to a fuel leak while driving or parked. This defect poses a significant risk to vehicle occupants and bystanders, as fuel leaks can ignite and cause fires.

Background of the Issue

Honda first became aware of the issue in November 2023, when they received a warranty claim related to a fuel leak in an affected TLX vehicle. The company promptly launched an investigation, which revealed that a defect related to motor vehicle safety existed. As a result, Honda decided to conduct a safety recall to address the problem. To date, the company has received two warranty claims related to this issue, but fortunately, there have been no reports of injuries, fires, or deaths.

Cause of the Defect

The root cause of the defect lies in the production process of the fuel tank assembly. During manufacturing, the fuel filler neck was improperly loaded into the gripper fixture, resulting in a tilted position and uneven contact between the fuel tank and fuel filler neck during the weld procedure. Additionally, the fuel filler neck melt depth was incorrectly set for the weld equipment, leading to a shallow melt weld depth between the components. This combination of factors created an incomplete weld that can separate over time, allowing fuel to escape.

Symptoms of a Fuel Leak

If you own a 2021-2023 Acura TLX, it’s essential to be aware of the symptoms of a fuel leak. One of the most common signs is a strong gasoline odor wafting through the vehicle while driving. This can be caused by a variety of factors, including worn-out seals, cracked fuel lines, or faulty fuel system components. As cars age, the rubber components in their fuel systems can deteriorate, allowing gas to escape. Common culprits behind these leaks include the fuel pump, filter, and injectors, as well as parts of the emissions system.

Risks Associated with Fuel Leaks

A gasoline smell is not just a minor annoyance; it can also be a sign that your engine is burning more fuel than necessary, which can hit you in the pocketbook. More alarmingly, prolonged exposure to gas fumes can have serious health consequences, including respiratory damage. Given the potential risks to both your wallet and well-being, it’s crucial to address any issues causing a gasoline smell in your TLX promptly.

Recall Details

To rectify the issue, dealers will replace the fuel tank assembly. Owner notification letters are expected to be mailed on February 10, 2025. Acura’s number for this recall is JKX, and the NHTSA campaign number is 24V-950. If you receive a notice for this problem, it’s essential to schedule a service appointment as soon as possible to have the fuel tank assembly replaced.

connecting rod defect The National Highway Traffic Safety Administration (NHTSA) has launched an investigation into certain Acura and Honda vehicles due to reports of failing connecting rod bearings. This issue affects model year 2018-2020 Acura TLX, 2016-2020 Acura MDX, 2016-2020 Honda Pilot, 2018-2019 Honda Odyssey, and 2017-2019 Honda Ridgeline vehicles equipped with the 3.5 liter V6 engine.

What’s Happening?

The Office of Defects Investigation (ODI) has received 173 reports from vehicle owners about failing connecting rod bearings in these models. Although a recall (23V-751) was issued to address this type of failure, all 173 reports show failures that are consistent with those addressed in the recall but are not included in its scope.

Why is This a Concern?

The connecting rod bearing is a critical component in the engine, and its failure can lead to serious engine damage. If you own one of these vehicles, it’s essential to be aware of this potential issue.

What’s Being Done About It?

The ODI has opened an investigation (Recall Query RQ) to assess the severity of the alleged defect in vehicles not included in recall 23V-751. They will also review the scope of the recall to determine if it adequately addresses the problem.

What to Do Next

If you own one of these vehicles and have experienced a connecting rod bearing failure, 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 engine failures and keep you safe on the road.

Key Facts

Affected Vehicles: Certain Acura and Honda models (2018-2020 Acura TLX, 2016-2020 Acura MDX, 2016-2020 Honda Pilot, 2018-2019 Honda Odyssey, and 2017-2019 Honda Ridgeline)
Component: Connecting rod bearing
NHTSA Action Number: Recall Query (RQ)
Previous Recall: 23V-751

Remember, your vehicle’s safety is in your hands. Stay vigilant, and take action if you suspect any issues with your vehicle.

In a concerning development for Acura ZDX All-Wheel Drive owners, a potentially dangerous issue has been identified within certain 2024 models. The problem, rooted in the vehicle’s anti-lock brake system (ABS), could lead to unexpected activation of the ABS, causing a release of brake pressure that significantly diminishes braking performance. This defect poses an increased risk of accidents, particularly during specific low-speed braking events.

The problem first came to light in July 2024 when Honda, Acura’s parent company, was notified by General Motors (GM) about the issue. GM had received reports of two minor accidents, both allegedly linked to a sudden loss of braking, which were suspected to be caused by a software glitch in the ABS. In addition to these accidents, GM also reported a field complaint regarding the issue, though no accident had occurred in that instance.

Honda quickly launched an investigation into the matter. Upon closer examination, it was discovered that the issue was indeed related to a defect in the anti-lock brake system. Specifically, during certain braking events at speeds below 25 mph on dry surfaces, the ABS may activate with undue sensitivity. If this occurs and a specific sequence of wheel movements follows, the ABS will continue to release brake pressure in the service brake system. The result is a dramatic reduction in stopping performance, or in some cases, a complete failure of the brakes, greatly increasing the risk of a crash.

After confirming the defect, Honda determined that it posed a significant safety risk and initiated a safety recall. The company has emphasized that, as of now, no warranty claims, field reports, or incidents involving injuries or crashes related to this defect have been reported in Acura vehicles.

Affected vehicle owners will be notified of the recall and instructed to perform an iN VIN status inquiry to verify if their vehicle is eligible for the update. This notification is crucial for ensuring that all potentially affected vehicles, including those in new or used vehicle inventories, are addressed promptly.

To resolve this issue, Acura will be updating the electronic brake control module software. This update will be delivered either through an over-the-air (OTA) update or by visiting an Acura dealership. The update is designed to correct the sensitivity of the ABS, preventing the unexpected release of brake pressure and restoring normal braking function.

Acura has designated this recall with the internal number UJE, while the National Highway Traffic Safety Administration (NHTSA) has assigned it the campaign number 24VC-614.

Owners of the 2024 Acura ZDX All-Wheel Drive are urged to check whether their vehicle is affected by this recall. If you own one of these vehicles, it’s important to respond to the recall notice and ensure that the necessary software update is performed as soon as possible. This proactive step will help avoid the risks associated with the ABS defect and ensure your vehicle operates safely.

Honda and Acura have identified a potential issue related to the tie rod fastener in certain vehicle models. This manufacturing concern could lead to the separation of the brake master cylinder from the booster assembly, compromising brake function and potentially increasing the risk of accidents.

The following Honda and Acura vehicle models have been identified as being potentially affected by this recall:

2020-2021 Honda Civic
2020-2023 Honda Ridgeline
2021-2023 Honda Passport
2021-2022 Honda Pilot
2020 Acura MDX

Honda first became aware of the problem in December 2020 when a missing nut was discovered in the brake booster tie rods. The company notified the component part supplier and initiated an investigation to identify the root cause. The investigation revealed that the brake master cylinder may have been improperly fastened to the brake booster assembly during the manufacturing process, resulting in the presence of loose or missing tie rod nuts. This assembly flaw could potentially lead to the breakage of tie rod studs, causing the brake master cylinder to separate from the brake booster assembly.

Potential Consequences and Safety Concerns: In the event of a separation between the brake master cylinder and the brake booster assembly, drivers may experience diminished or complete loss of brake function. This compromised braking capability significantly increases the risk of accidents and injuries. Recognizing the seriousness of the situation, Honda has taken immediate action to address the issue and ensure the safety of its customers.

Recall and Repair Process: As a proactive measure, Honda has issued a recall for the affected vehicles. Authorized dealerships will inspect the brake booster assembly and perform the necessary repairs to rectify any potential issues. To facilitate the recall process, Honda has assigned the following identification numbers: VEU, AEV, and ZET. Additionally, the National Highway Traffic Safety Administration (NHTSA) has assigned the campaign number 23V-458 to this recall.

Category Archives: Acura

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