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.
Circuit/System Verification
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Verification
- Verify DTC B3604, B3605, or B3606 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, observe the scan tool Pedal Forward Switch and Pedal Aft Switch parameters while cycling the adjustable pedal switch between the FWD and RWD position. The appropriate parameter should change between Active and Inactive as commanded.
- If the parameters do not change between the specified values, refer to Adjustable Pedal Switch Circuit Malfunction.
- Verify the scan tool Pedal Position parameter is between 0.45-4.55 volts.
- If not within the specified range, refer to Adjustable Pedal Position Sensor Circuit Malfunction.
- Command the adjustable pedals to move forward and rearward. The pedals should move in the commanded direction.
- If the pedals do not move in the commanded direction, refer to Adjustable Pedal Motor Circuit Malfunction.
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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.