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 (Pcm)
The PCM maintains constant communication with TAC module to operate cruise control system. PCM will not allow activation of cruise control system until both brake switches (TCC brake switch/cruise control brake switch and brakelight switch) and clutch switch (if equipped) signals have been verified at the beginning of the ignition cycle. PCM sets and stores DTCs to identify circuit/component faults in cruise control system. The PCM will inhibit cruise control when:
- Engine is off.
- Automatic transaxle is in Park, Reverse, Neutral or 1st gear.
- Manual transaxle is in Neutral.
- Engine speed is too high/low.
- Vehicle speed is too high/low.
- Engine Coolant Over Temperature-Fuel Disabled mode is active.
- TAC module detects an R/A switch fault
- TAC module detects a SET switch fault.
- ABS/traction control system is active for greater than 2 seconds.
- Undercharged or overcharged battery condition exists.
- PCM detects a vehicle speed sensor fault.
- TCC brake switch (A/T), cruise control brake switch (M/T), cruise control clutch switch (if equipped), or brakelight switch fault is detected.
- An internal PCM fault is detected.
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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.