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.
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HOMESERVICE MANUALSCHEVROLET2009UPLANDER LT, 3.9 MREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0253 OR C0254CIRCUIT/SYSTEM TESTING
2009 Chevrolet Uplander LT, 3.9 M
Circuit/System Testing
2009 Chevrolet Uplander LT, 3.9 MSECTION Circuit/System Testing
- Observe the scan tool SWPS Signal A and SWPS Signal B parameters while turning the steering wheel left and right. Verify the parameters increase and decrease smoothly while the steering wheel is being turned.
- If the parameters do not change smoothly, replace the steering wheel position sensor.
- Operate the vehicle within the conditions for setting the DTC. Verify DTC C0186, C0196, C0253 or C0254, C0460 or C0461 are not set.
- If DTC C0186, C0196, C0253, C0460 or C0461 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If DTC C0253 or C0254 is set, replace the yaw and lateral acceleration sensor. If DTC C0253 or C0254 sets again, replace the EBCM.
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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.