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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEWINDOWSDOOR SYSTEM, MIRROR SYSTEM & WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3127DIAGNOSTIC AIDS
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Diagnostic Aids

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Diagnostic Aids

If the DTC B3127 is accompanied by DTC B3132 and B3137, the fault may be any of the following:

  • An open BCM PWR 15-amp fuse, which could be caused by any of the following:
    • The BCM is shorted to ground internally.
    • Any of the door lock actuator lock or unlock control circuits are shorted to ground.
  • The BCM has an internal open.

If DTC B3127 is set as current and DTCs B3132 and B3137 will not set with multiple lock and unlock switch activations, the BCM is internally open.

DTC B3127

Step Action Yes No
Connector End View Reference: Power Door Systems Connector End Views  or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 Is DTC B3127 set as a current DTC? Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 Operate a door lock switch to the lock and unlock position multiple times.
Did DTCs B3132 and B3137 also set as current?		 Go to Step 4  Go to Step 6 
4 Is the body control module (BCM) PWR 15-amp fuse open? Go to Step 5  Go to Step 6 
5 Test for a short to ground in the driver door lock actuator unlock control, the passenger door lock actuator unlock control, and the door lock actuator lock control circuits. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 6 
6 Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 7 
7 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.