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.

2002 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE

Cruise Control DTCS

CRUISE CONTROL DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC	Description
DTC P0567	TAC Module Detects The Resume/Accel Switch Is ON
DTC P0568	TAC Module Detects The Set/Coast Switch Is ON
DTC P0571	TCC Brake Switch Circuit Voltage High
DTC P1574	Vehicle Speed Decreases Without Stop Lamp Switch Transition

Chapter Navigation

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Factory Service Tools

Use the Manual With the Right Hardware

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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.