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C0265 Code Explained: Causes, Symptoms & Electronic Brake Control Module Relay Circuit Fixes

An OBD-II scanner displaying C0265 with the Electronic Brake Control Module highlighted on the ABS hydraulic unit, showing an internal relay circuit while the ABS and StabiliTrak warning lights are illuminated.

If your scan tool displays C0265, your vehicle’s Electronic Brake Control Module (EBCM) has detected a fault within its internal relay circuit or the relay control circuit responsible for powering the ABS and stability control system.

Unlike C0252, which typically refers to the ABS pump motor relay, C0265 generally indicates the EBCM has detected an internal relay malfunction or that the relay controlling the ABS module itself is not operating correctly. This is a common manufacturer-specific code on many General Motors (GM) vehicles equipped with StabiliTrak.

When the relay fails to operate correctly, the ABS module may lose power or be unable to activate critical braking functions. The EBCM stores C0265 and typically disables ABS, Traction Control, and Electronic Stability Control (ESC/StabiliTrak) until the issue is repaired.

For additional chassis diagnostics and repair guides, visit our Complete OBD-II Trouble Code Guide:

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Quick Facts

ItemInformation
OBD-II CodeC0265
DescriptionElectronic Brake Control Module Relay Circuit
CategoryChassis (C) Codes
SystemAnti-lock Braking System (ABS)
Severity★★★★☆ High
Safe to Drive?Yes, but ABS and stability systems may be disabled
Common CausesFailed EBCM relay, cracked solder joints, faulty EBCM, damaged wiring, low system voltage
Typical Repair Cost$100–1,800

What Does C0265 Mean?

The C0265 code indicates the Electronic Brake Control Module has detected a malfunction involving its relay circuit.

The relay supplies electrical power to critical ABS components and allows the EBCM to control:

On many GM vehicles, C0265 is frequently caused by failed solder joints inside the EBCM, preventing reliable relay operation.

If the relay feedback doesn’t match the commanded state, the module stores C0265 and disables several safety systems.

Symptoms of C0265

Common symptoms include:

The vehicle generally continues to brake normally under everyday driving conditions.

Common Causes

Failed Electronic Brake Control Module

Internal EBCM failures are among the leading causes of C0265.

Common internal failures include:

Cracked Solder Joints

This is especially common on GM trucks and SUVs.

Repeated heat cycling can crack solder joints connecting the relay to the EBCM circuit board.

Low Battery Voltage

Weak batteries or poor charging system performance can prevent the relay from operating correctly.

Damaged Wiring

Inspect for:

Poor Ground Connection

A poor ground can prevent proper relay activation.

Blown Fuse

Although less common than C0252, blown ABS fuses should still be inspected.

How Serious Is C0265?

High.

While conventional braking remains functional, several electronic safety systems are usually disabled:

Emergency handling on slippery roads is significantly reduced.

Can You Drive With C0265?

Yes—but carefully.

Without ABS and stability control:

The vehicle should be repaired promptly.

How to Diagnose C0265

1. Scan the ABS Module

Use a professional scan tool capable of reading manufacturer-specific ABS data.

Check for related codes including:

2. Check Battery Voltage

Verify:

Low voltage frequently contributes to relay faults.

3. Inspect Fuses

Inspect all ABS-related:

4. Inspect Wiring

Check for:

5. Test Relay Operation

Many professional scan tools allow active testing of the EBCM relay.

Verify:

6. Inspect the EBCM

On many GM vehicles, removing the EBCM and inspecting the circuit board often reveals cracked solder joints around the relay.

Some specialty repair companies rebuild these modules rather than replacing them.

Common Repairs

RepairEstimated Cost
Repair wiring$100–300
Replace fuse$20–50
Clean ground connection$50–150
Rebuild Electronic Brake Control Module$200–500
Replace Electronic Brake Control Module$700–1,800
Module programming$100–250

Common Diagnostic Mistakes

Technicians frequently:

Vehicles Commonly Affected

C0265 is especially common on:

The code is particularly common on 1999–2013 GM trucks and SUVs equipped with Bosch ABS systems.

How to Prevent C0265

Reduce the likelihood of C0265 by:

Frequently Asked Questions

What causes C0265?

The most common causes include a faulty Electronic Brake Control Module, cracked solder joints, damaged wiring, poor ground connections, blown fuses, or low battery voltage.

Is C0265 dangerous?

While normal braking remains functional, the loss of ABS and stability control reduces emergency braking performance and vehicle stability.

Is C0265 common on GM trucks?

Yes.

It is one of the most common ABS codes found on GM trucks and SUVs, often caused by cracked solder joints inside the Electronic Brake Control Module.

Can an EBCM be repaired?

In many cases, yes.

Several specialized rebuilders repair cracked solder joints and failed relay circuits at a lower cost than replacing the entire module.

Does C0265 affect engine performance?

No.

The code only affects braking and chassis safety systems.

Final Thoughts

The C0265 code indicates a malfunction within the Electronic Brake Control Module relay circuit, preventing reliable operation of the ABS and stability control systems. On many GM vehicles, this code is frequently caused by cracked solder joints inside the EBCM rather than a complete module failure, making professional rebuilding a cost-effective repair option.

Most repairs involve inspecting battery voltage, verifying relay operation, checking wiring and grounds, and determining whether the EBCM can be rebuilt or requires replacement. Proper diagnosis can prevent unnecessary replacement of expensive ABS components.

For additional chassis diagnostics and repair guides, browse our complete Chassis (C) OBD-II Code Library:

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