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Old 12-30-2008, 05:54 PM   #1
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Default Help with code C0265

Hey guys a buddy of mine has a 2001 silverado. The ABS and brake light lit up a couple days ago. We have a generic computer here where I work, since we mainly work on Mazdas. Anyway we pulled code C0265 can anybody tell me what this code is for exactly or help me out with it's meaning? Any help greatly appreciated... T.I.A
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Old 12-30-2008, 06:22 PM   #2
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Everything I've found says "Left Rear Position Sensor Circuit" but haven't seen where it is or any solution to it.

I'd check the connection on the Left Rear brake.
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Old 12-30-2008, 10:00 PM   #3
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According to Alldata.........

DTC C0265 or C0266

Circuit Description
The ABS relay supplies battery voltage to 6 valve solenoids. 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.

DTC Descriptor s
This diagnostic procedure supports the following DTC's:


DTC C0265 EBCM Motor Relay Circuit
DTC C0266 EBCM Motor Relay Circuit
Conditions for Running the DTC


The ignition is ON.
The vehicle speed is greater than 6 km/h (4 mph) .
Conditions for Setting the DTC
The EBCM detects an internal malfunction.

Action Taken When the DTC Sets C0265
If equipped, the following actions occur:


The EBCM disables the DRP/ABS.
The ABS indicator turns ON.
The brake warning indicator turns ON.

C0266
If equipped, the following actions occur:


The EBCM disables the ABS.
The ABS indicator turns ON.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTC's function.

Diagnostic Aids

Important: Whenever the EBCM is replaced for DTC C0265 or C0266, the ABS pump motor and motor circuitry must be tested for the proper resistance. Refer to steps 7 and 8 in the diagnostic table below for testing procedures and resistance values.

C0265
Thoroughly inspect connections and circuitry that may cause an intermittent malfunction.

C0266
Replace the EBCM if DTC C0266 continues to set intermittently.
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Old 12-31-2008, 08:48 AM   #4
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and that is why I love this board... thanx for all your help guys.
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Old 01-05-2009, 08:13 PM   #5
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there was an issue with a ground on some year models that would set a code. ground location on drivers side frame rail at cab mount area. remove the bolt, clean and reinstall.
fixed an 2002 I had.
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Old 01-05-2009, 08:53 PM   #6
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+1 on the ground, its abig issue. If the ground does not fix it, he will need an EBCM.
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Old 01-05-2009, 09:10 PM   #7
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OMG... this is the same crap that I'm going through as we speak.

Eric showed me where to check the module and the connections under the truck, the ground, and the fuses, and tonight I went to NTB to have one of the guys check the ABS connections and all was good. Then he checked the coding. The first was C0238 which said "Wheel Speed Mismatch", and the second code was C0265 which is the "ECBM Relay Circuit". The tech at NTB told me that replacing the relay should clear the issue, but there's no promise. Now since we checked the fuses, the system hasn't coded, but I will continue to get what needs done, done.

So I'm hoping that replacing the relay circuit will cure my coding. Now I have to find the circuit. If this doesn't correct the issue, which I'm praying that it does, I may have to make the $1100 purchase which I'm not looking forward to.

Fireman31, thanks for the info... )
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Old 01-05-2009, 09:19 PM   #8
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Quote:
Originally Posted by Fireman31 View Post
According to Alldata.........

DTC C0265 or C0266

Circuit Description
The ABS relay supplies battery voltage to 6 valve solenoids. 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.

DTC Descriptor s
This diagnostic procedure supports the following DTC's:


DTC C0265 EBCM Motor Relay Circuit
DTC C0266 EBCM Motor Relay Circuit
Conditions for Running the DTC


The ignition is ON.
The vehicle speed is greater than 6 km/h (4 mph) .
Conditions for Setting the DTC
The EBCM detects an internal malfunction.

Action Taken When the DTC Sets C0265
If equipped, the following actions occur:


The EBCM disables the DRP/ABS.
The ABS indicator turns ON.
The brake warning indicator turns ON.

C0266
If equipped, the following actions occur:


The EBCM disables the ABS.
The ABS indicator turns ON.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTC's function.

Diagnostic Aids

Important: Whenever the EBCM is replaced for DTC C0265 or C0266, the ABS pump motor and motor circuitry must be tested for the proper resistance. Refer to steps 7 and 8 in the diagnostic table below for testing procedures and resistance values.

C0265
Thoroughly inspect connections and circuitry that may cause an intermittent malfunction.

C0266
Replace the EBCM if DTC C0266 continues to set intermittently.
Nice INFO... Thanks for sharing
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Old 01-05-2009, 10:04 PM   #9
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think the relay is built into the abs module, good prices on reman modules on ebay, but check that ground first.
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Old 05-13-2009, 11:08 AM   #10
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Hey Guys, Does anyone know where the EBCM ground locations are for a 2000 Chevy Astro 2wd? I have one with an C0265 code and the Red brake light on at the same time.
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Old 05-13-2009, 11:08 AM
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