What Does C0265 Mean?
C0265 indicates the Electronic Brake Control Module (EBCM) has detected a malfunction in its internal relay circuit or the power supply relay circuit that energizes the ABS hydraulic pump motor. The EBCM monitors the relay coil and contact resistance, current draw, and voltage supply to verify proper operation. This code sets when the EBCM detects an open circuit, short circuit, excessive resistance, or relay failure preventing proper ABS/traction control system operation.
Safety Warning
Vehicle is unsafe to drive as ABS, traction control, and stability control systems are disabled. Normal braking function may be available but without anti-lock capability, significantly increasing stopping distances on slippery surfaces and risk of wheel lockup during emergency braking. Repair immediately before operating vehicle.
Common Causes
45%
Failed EBCM internal relay or stuck relay contacts within the EBCM housing
30%
Corroded or damaged wiring/connectors between battery/fuse box and EBCM relay circuit
15%
Blown fuse or fusible link in EBCM power supply circuit
10%
Failed EBCM module with internal circuit board damage
Diagnostic Steps
1
Step 1: Perform visual inspection of EBCM connector for corrosion, bent pins, or moisture intrusion. Check all ABS-related fuses in both underhood and interior fuse boxes with test light or multimeter for continuity and proper 12V supply
2
Step 2: Using a multimeter, verify battery voltage (12.5-14.5V) at EBCM power supply terminals with key on, engine running. Check ground circuit continuity from EBCM ground pin to battery negative (should read less than 0.5 ohms resistance)
3
Step 3: Access EBCM relay circuit wiring diagram and backprobe relay control circuit at EBCM connector. Measure voltage and continuity on relay coil terminals (typically 85 and 86) and switched power terminals (typically 30 and 87) while commanding relay on/off with scan tool bi-directional controls if available
4
Step 4: If external wiring and power supply test good, suspect internal EBCM relay failure. Monitor relay operation with oscilloscope or listen for audible relay click during system self-test at key-on. If no relay activity detected with good power/ground, replace EBCM
5
Step 5: After repairs, clear codes and perform ABS system self-test by driving vehicle above 20 mph and verify ABS warning light extinguishes. Monitor live data for proper EBCM relay voltage and current readings
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
C0265 indicates the Electronic Brake Control Module (EBCM) has detected a malfunction in its internal relay circuit or the power supply relay circuit that energizes the ABS hydraulic pump motor. The EBCM monitors the relay coil and contact resistance, current draw, and voltage supply to verify prope...
The most common cause of C0265 (EBCM Relay Circuit) is: Failed EBCM internal relay or stuck relay contacts within the EBCM housing
Typical repair costs for C0265 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is unsafe to drive as ABS, traction control, and stability control systems are disabled. Normal braking function may be available but without anti-lock capability, significantly increasing stopping distances on slippery surfaces and risk of wheel lockup during emergency braking. Repair immediately before operating vehicle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0265 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS) / Electronic Brake Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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