AutoCodes – GMC – C0265 GMC

C0265 GMC Code - EBCM Motor Relay Circuit Low When On

Quick Answer

The ABS relay supplies battery voltage to six valve solenoids (RF dump/isolation, LF dump/isolation, and rear dump/isolation). Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C0265 GMC indicates EBCM Motor Relay Circuit Low When On.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 22,201

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 02, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code C0265 GMC Description

The ABS relay supplies battery voltage to six valve solenoids (RF dump/isolation, LF dump/isolation, and rear dump/isolation). The Electronic Brake Control Module (EBCM) microprocessor applies the grounds needed to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.

OBDII Code C0265 GMC - EBCM Motor Relay Circuit Low When On - AutoCodes.com — C0265 GMC Code - EBCM Motor Relay Circuit Low When On

What does this mean?

What are the Possible Causes of the DTC C0265 GMC?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module (EBCM) harness is open or shorted
Electronic Brake Control Module (EBCM) circuit poor electrical connection

How to Fix the DTC C0265 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0265 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0265 GMC Code

1. What does the OBDII code C0265 mean on a GMC vehicle?

C0265 indicates a problem with the EBCM (Electronic Brake Control Module) motor relay circuit, specifically that the circuit's voltage is too low when the relay is activated.

2. What are the common symptoms of code C0265 on a GMC?

Symptoms may include the ABS light being illuminated, loss of ABS functionality, and reduced braking performance under certain conditions.

3. What causes the C0265 code to appear in a GMC?

Common causes include a faulty EBCM relay, corroded or damaged wiring and connectors, a failing EBCM, or low system voltage due to battery or charging system issues.

4. Can I drive my GMC with the C0265 code active?

Yes, but it is not recommended. While the vehicleâ€™s regular brakes will still function, the ABS system may be disabled, increasing the risk of wheel lockup during hard braking.

5. How do I diagnose the C0265 code on a GMC?

Begin by checking the battery voltage and ensuring all connections are clean and secure. Inspect the wiring and connectors to the EBCM for corrosion or damage and test the motor relay for proper operation.

6. What tools are needed to fix the C0265 code?

A basic set of tools, a multimeter, and an OBDII scanner capable of reading ABS system codes are needed for diagnosis and repair.

7. How much does it cost to repair code C0265 on a GMC?

The cost depends on the root cause. Replacing a faulty relay is relatively inexpensive, while replacing the EBCM can cost $500 to $1,200, including labor.

8. Can a weak battery cause the C0265 code?

Yes, a weak or failing battery can cause the EBCM motor relay circuit to receive insufficient voltage, triggering the C0265 code.

9. Does the C0265 code always require EBCM replacement?

No, the issue may be due to a bad relay, corroded connections, or damaged wiring, which can often be repaired without replacing the EBCM.

10. How can I prevent the C0265 code from recurring on my GMC?

Regularly inspect and clean electrical connections, ensure the battery and charging system are in good condition, and address any ABS-related issues promptly.