Cruise Control Set Signal Malfunction
The P0568 code indicates that the powertrain control module (PCM) has detected an issue with the cruise control set signal circuit. This typically means the signal from the cruise control switch or the brake switch is not reaching the PCM correctly, or the PCM itself is faulty. The system may fail to engage or disengage the cruise control as intended.
1. Most Common Causes
- Faulty cruise control Set/Coast switch
- Short or open circuit in the switch wiring
- Loose, corroded, or poor electrical connections at the switch or ECM/BCM connector
- Blown cruise control system fuse
- Damaged ECM or BCM (uncommon)
2. Symptoms You Will Notice
- Cruise control does not engage
- Cruise control disengages unexpectedly
- Cruise control set light does not illuminate
- Engine Check Light illuminated
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Inspect the cruise control switch and brake switch for proper operation and continuity.
Step 3: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test the signal voltage at the PCM using a multimeter to verify the circuit integrity.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the cruise control will not function. The vehicle's normal braking and acceleration are unaffected.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, depending on the cause. Replacing a switch is usually under $100, while PCM replacement can be more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.