2019-2024 Cadillac XT4 & Buick Envision ABS Module: Recall, Programming, and Replacement Guide
This guide covers the critical details for the integrated ABS module assembly found in the Cadillac XT4 and Buick Envision, including a key recall and mandatory programming requirements.
- This part is a complete assembly including the electronic module, hydraulic pump, booster, and master cylinder.
- A replacement module, whether new or used, absolutely requires professional programming to the vehicle's VIN to function.
- A critical recall (A202307260) was issued for 2020 XT4 models for a potential loss of brake boost, requiring module replacement.
- Driving with a failed module is possible, but disables ABS, traction control, and stability control. If the pedal is hard to press, the vehicle is unsafe.
Symptoms of a Failing ABS Module Assembly
A problem with the ABS module assembly on your Cadillac XT4 or Buick Envision will trigger several dashboard warnings and may cause noticeable changes in braking performance.
- ABS, Traction Control, and StabiliTrak Lights: The most common symptom is the simultaneous illumination of the ABS, Traction Control (TC), and/or Service StabiliTrak warning lights on the instrument cluster. These systems all depend on the ABS module, so they are disabled when it fails.
- Brake System Warning Light: A red brake warning light may also appear, often indicating a more serious issue within the integrated brake system.
- Unresponsive or Hard Brake Pedal: You may notice the brake pedal becomes hard to press or requires significantly more effort to stop the vehicle. This can be a sign of failure in the electronic brake boost portion of the assembly.
- Wheels Locking Up: The main purpose of ABS is to prevent wheels from locking during a hard stop. If the module fails, your wheels may lock up and skid, especially on wet or slippery surfaces.
- Inaccurate Speedometer: In some cases, a failing ABS module can cause the speedometer to give incorrect readings or stop working altogether, as it relies on data from the wheel speed sensors.
Associated OBD-II Trouble Codes
A mechanic with a professional scan tool can read codes from the ABS module to help diagnose the issue. Common codes related to module failure include:
- C0110: ABS Pump Motor Circuit Failure
- C0121: ABS Control Module Performance
- C0265: EBCM (Electronic Brake Control Module) Relay Circuit
- U0125: Lost Communication with Multi-axis Acceleration Sensor Module
- U0151: Lost Communication with Restraints Control Module
TSB 19-NA-183 specifically addresses DTCs U0125 and U0151 on some 2020 Envision models, indicating a software reprogram for the EBCM may be the fix.
Known Issues, Recalls, and Technical Service Bulletins (TSBs)
Owners of these vehicles should be aware of a critical safety recall and several service bulletins related to the electronic brake control module.
NHTSA Recall A202307260 / 20V576000
Important Recall: General Motors issued a recall for certain 2020 Cadillac XT4 models (among other GM vehicles) due to a potential loss of electronic brake boost assist. Contamination in a sensor connection within the electronic brake boost system could interrupt communication, leading to a sudden loss of brake assist. This makes the brake pedal significantly harder to press, increasing the risk of a crash. The remedy is for a GM dealer to replace the electronic brake boost module free of charge.
Technical Service Bulletins (TSBs)
- TSB 21-NA-086: For some 2021 Cadillac XT4 models, this bulletin addresses an issue where the parking brake may engage unintentionally after starting the vehicle. The fix is to reprogram the Electronic Brake Control Module (EBCM) with updated software to modify its sensitivity.
- TSB 19-NA-183: For 2020 Buick Envision models, this TSB addresses a "Service ESC" or "Service Park Brake" message with DTCs U0125 or U0151. The solution is to reprogram the EBCM if no other issues are found.
Programming and Calibration: What to Expect After Installation
Warning: A replacement ABS module assembly, whether new or used, absolutely requires programming to your vehicle. This is not a plug-and-play part.
The module must be programmed with your vehicle's specific Vehicle Identification Number (VIN) and configuration data to communicate with the other computers in the car. Failure to program the module will result in it not functioning, and the ABS and StabiliTrak warning lights will remain on.
Who Can Program the Module?
Programming must be done by a GM dealership or a qualified independent repair shop that has the correct tools and a subscription to GM's software service. The process involves using GM's Service Programming System (SPS) software 🎬 See how to use SPS and J2534 tools for programming. with a compatible J2534 pass-thru device. 🎬 Watch: A demonstration of EBCM programming on a GM vehicle. When programming a used module, it is critical to select the "Replace and Reprogram" option in the software.
🎬 Watch: How to successfully program a used module on a Cadillac.Buying a Used ABS Module Assembly
Purchasing a used ABS module assembly can be a cost-effective solution, but it requires careful attention to detail to ensure you get a compatible and functional part.
- Verify the Part Number: This is the most critical step. There are many different part numbers for these modules based on vehicle options. You must match the part number from your original module exactly. Do not rely on visual appearance alone. The provided OEM part numbers are a starting point, but always match to your specific unit.
- Inspect for Damage: When you receive the part, inspect it carefully. Look for any cracks in the plastic housing, corrosion on the electrical connectors, or signs of brake fluid leaks from the hydraulic portion. A clean, well-cared-for part from a reputable recycler is your best bet.
- Understand It's an Assembly: Remember you are buying the entire integrated unit: module, pump, booster, and master cylinder. Ensure the seller is providing the complete assembly as shown in pictures.
- Factor in Programming Costs: A used module is significantly cheaper than a new one, but it will still require professional programming. Factor this cost into your total repair budget.
Cost Comparison
The cost to replace the ABS module assembly can vary significantly based on the parts source and labor rates.
| Item | Estimated Cost |
|---|---|
| New OEM Part | $650 - $1,000+ |
| Used OEM Part | $150 - $400 |
| Remanufactured Part | $300 - $800 |
| Shop Labor (Replacement & Bleeding) | $400 - $700 |
| Shop Labor (Programming) | $150 - $250 |
| Total Professional Replacement (New OEM) | $1,200 - $1,950+ |
Frequently Asked Questions (FAQ)
Can I drive my XT4 or Envision with a bad ABS module?
Yes, but with extreme caution. When the ABS module fails, your standard hydraulic brakes will still work, but you will not have anti-lock brakes, traction control, or stability control. This means your wheels can lock up during hard braking, increasing stopping distances and the risk of a skid. If the brake pedal feels very hard to press due to a loss of brake boost, the vehicle may be unsafe to drive and should be towed.
Does the ABS light always mean the whole module assembly is bad?
Not necessarily, but it's a strong possibility. The ABS warning light can also be triggered by a less expensive component, like a faulty wheel speed sensor or a wiring issue. However, given the integrated nature of this part and the known recall, failure of the entire assembly is common. A proper diagnosis with a scan tool that can read GM-specific ABS codes is required to confirm the cause.
Can I replace just the electronic part of the module?
On these specific models, the electronic module and the hydraulic unit are sold and replaced as a single assembly. While some older vehicles had separable modules, the design for the XT4 and Envision integrates them. Attempting to separate them is not recommended and may cause further damage.
Why are there so many different part numbers?
Part numbers for electronic modules change frequently due to software updates, hardware revisions, and supersessions. GM may release a new part number to address a specific issue or improve performance. The key is to use a part number that is verified to be compatible with your vehicle's VIN and specific options. A GM dealer or a knowledgeable parts supplier can help cross-reference numbers.
Helpful Videos
Technical Specifications
OEM Part Numbers: 84622767 84626672 84766750 86797233 42798614 84523276 84537301 84594569 84594570 84688356 84688367 84840612 84877528 84940606
This is an integrated assembly containing the Electronic Brake Control Module (EBCM), hydraulic pump, electronic brake booster, and master cylinder. It uses a Continental Teves Mk100 system architecture.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Cadillac XT4:
- Buick Envision:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing ABS Module Assembly
- Associated OBD-II Trouble Codes
- Known Issues, Recalls, and Technical Service Bulletins (TSBs)
- NHTSA Recall A202307260 / 20V576000
- Technical Service Bulletins (TSBs)
- Programming and Calibration: What to Expect After Installation
- Who Can Program the Module?
- Buying a Used ABS Module Assembly
- Cost Comparison
- Frequently Asked Questions (FAQ)
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