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.
Powertrain Control Module
The speed control electronic control circuitry is integrated into Powertrain Control Module (PCM). The PCM is located in the engine compartment on driver's side under the speed control servo. The PCM speed control functions are monitored by On-Board Diagnostics (OBD). All OBD sensed systems are monitored by PCM. Each monitored circuit is assigned a Diagnostic Trouble Code (DTC). The PCM will store a DTC in electronic memory for any failure it detects. See DIAGNOSTIC TROUBLE CODE INDEX in SELF-DIAGNOSTIC SYSTEM. The PCM cannot be repaired and must be replaced if faulty.
Use the DRB scan tool, or equivalent aftermarket scan tool, to reprogram the new PCM with the vehicles original identification number (VIN) and the vehicles original mileage. If this step is not done, a Diagnostic Trouble Code (DTC) may be set.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.