Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B2747: Traction Control Switch Circuit Low
2000 Buick Century CustomSECTION DTC B2747: Traction Control Switch Circuit Low
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Install scan tool. Turn ignition on, with engine off. Using scan tool, observe TCS switch state input parameter in BCM input data list. If scan tool displays ACTIVE, go to next step. If scan tool does not display ACTIVE, check switch that may be sticking in pressed position.
- Turn ignition off. Disconnect traction control switch. Turn ignition on, with engine off. Using scan tool, observe TCS switch state input parameter. If scan tool displays INACTIVE, go to step 6 . If scan tool does not display INACTIVE, go to next step.
- Check traction control switch input/signal circuit for short to ground. Repair as necessary. After repairs, go to step 9 . If circuit is okay, go to next step.
- Check for poor connections at BCM harness connector. Repair as necessary, go to step 9 . If connections are okay, go to step 7 .
- Check for poor connections at traction control switch connector. Repair as necessary. After repairs, go to step 9 . If connections are okay, go to step 8 .
- Replace BCM. After repairs, go to step 9 .
- Replace traction control switch. After replacing switch, go to next step.
- Using scan tool, clear DTCs. Ensure battery voltage is 9-16 volts and parking brake is not applied. Recheck DTCs. If DTC resets, go to step 2 . If DTC does not reset, system is okay.
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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.