2010-2011 Equinox & Terrain ABS Module: Programming, Symptoms, and Replacement

Symptoms of a Failing ABS Control Module

When the ABS control module in your 2010-2011 GMC Terrain or 2010 Chevrolet Equinox begins to fail, it will typically trigger a number of warnings on your dashboard and changes in brake behavior. 🎬 Watch: 6 common symptoms of a bad ABS module The most common sign is a combination of warning lights all appearing at once.

• ABS Warning Light: This is the most common and direct indicator of a problem within the anti-lock braking system.
• StabiliTrak / Traction Control Warning Lights: Because the ABS module controls these systems, its failure will disable them, illuminating their respective warning lights on the instrument cluster.
• Brake System Warning Light: A red brake warning light may also illuminate, indicating a serious fault in the braking system.
• Unintended ABS Activation: You might feel the brake pedal pulsating or hear the ABS pump running during normal, low-speed braking on dry pavement. This happens when the module misinterprets sensor data and activates the system unnecessarily.
• Unresponsive or Hard Brake Pedal: In some cases, the brake pedal may feel unusually firm or unresponsive, requiring more effort to stop the vehicle.
• Wheels Locking Up: The most critical symptom is a complete loss of ABS functionality. During a hard stop, the wheels may lock up and skid, which is what the system is designed to prevent.

Common Diagnostic Trouble Codes (DTCs)

A professional scan tool that can read ABS codes is necessary for a proper diagnosis. If your module is failing, you will likely see one or more of the following codes:

• C0035-C0050: These codes correspond to issues with the wheel speed sensor circuits (e.g., C0035 for Left Front, C0040 for Right Front). While this can indicate a bad sensor, seeing multiple wheel speed sensor codes at once often points to a faulty ABS module.
• C0110: Pump Motor Circuit Malfunction.
• C0265 / C0267 / C0268: These codes point to problems with the EBCM relay or the pump motor circuit, often indicating an internal failure within the module.
• U0121: Lost Communication With Electronic Brake Control Module.

Known Issues, TSBs, and Recalls

While there are no specific recalls for the ABS control module on the 2010-2011 GMC Terrain and 2010 Chevrolet Equinox, there was a related recall that owners should be aware of.

Recall 09298 (NHTSA Campaign 09V489000): This recall, issued in December 2009, affected over 59,000 2010 Equinox and Terrain vehicles. The issue was related to software in the center instrument panel that could cause the heating, A/C, defrost, and radio controls to become inoperative. While not directly an ABS module failure, it highlights the complex electronic nature of these vehicles. There are no widespread TSBs specifically for ABS module failure on these models, but problems are commonly discussed in owner forums.

Programming and Calibration Requirements

Simply installing the part will not fix the problem. The ABS light will remain on, and the system will not work until programming is complete. This is not a plug-and-play part.

• Who can program it? A GM dealership or a well-equipped independent repair shop can perform the programming. Most DIY-level scan tools cannot perform this function. The shop will need a tool like a GM Tech 2 or MDI with an active subscription to GM's Service Programming System (SPS).
• Can I use a used module? Yes, a used module can be installed and programmed. The programming process will overwrite the VIN from the donor vehicle with your vehicle's VIN.
• Is there an anti-theft link? The programming links the module to your vehicle's other computers. While not strictly an anti-theft system like the ignition, it is a necessary security and configuration handshake that ensures all systems communicate correctly.

Buying a Used ABS Control Module

Purchasing a used OEM ABS module is a great way to save money, especially since new parts can be expensive or hard to find. However, there are important things to consider.

1. Verify the Part Number: The most important step is to match the part number exactly. The OEM part numbers for this application include 25926937, 25926939, 20837392, and 25933427. While other numbers may interchange, matching the number on your original unit is the safest bet.
2. Inspect the Connectors: When you receive the part, check the electrical connector pins for any signs of corrosion, bending, or damage. A clean connector is crucial for proper communication.
3. Check for Physical Damage: Inspect the module housing for cracks or signs of being tampered with. The module is typically sold attached to the hydraulic pump/valve body.
4. Budget for Programming: Remember that the cost of the part is not the final cost. You MUST factor in the price of having the module programmed by a shop, which typically costs between $100 and $200.
5. Why Used OEM is a Good Choice: Used OEM modules are the same parts that were installed at the factory. They are designed for your vehicle and, once programmed, offer the same performance and durability as a new part, often at a fraction of the cost.

Replacement Overview

Replacing the ABS module and pump assembly is a moderately difficult job that can be done by an experienced DIY mechanic. The unit is located under the hood, beneath the fuse box on the driver's side.

Difficulty: 3/5
Key Steps:

1. Disconnect the battery.
2. Remove the under-hood fuse box to gain access.
3. Disconnect the main electrical harness from the ABS module.
4. Using flare nut wrenches to prevent stripping, carefully disconnect the brake lines from the hydraulic unit. Be prepared for some brake fluid spillage.
5. Unbolt the bracket holding the ABS assembly and remove it from the vehicle.
6. Installation is the reverse of removal.
🎬 See this step-by-step ABS module replacement walkthrough

Cost Comparison

Prices can vary, but here is a general breakdown of what to expect:

Frequently Asked Questions (FAQ)