Cruise Control Off Signal Malfunction
The P0566 code indicates that the powertrain control module (PCM) has detected a malfunction in the cruise control off signal circuit. This signal is typically sent when the cruise control cancel or off button is pressed, or when the brake pedal is applied. The PCM monitors this signal to disengage cruise control. A fault can be due to a shorted or open circuit, a faulty cruise control switch, or a problem with the brake pedal position sensor. This code does not affect engine performance but disables the cruise control system.
01. Most Common Causes
- Faulty cruise control switch
- Open or shorted cruise control circuit wiring
- Faulty brake pedal position sensor
- Corroded or loose electrical connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control light on dash may stay on or off
- Cruise control may not engage or disengage unexpectedly
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for other related codes.
Step 2: Inspect the cruise control switch and wiring for damage or corrosion.
Step 3: Test the brake pedal position sensor and its circuit for proper operation.
Step 4: Check the cruise control fuse and relay if applicable.
Step 5: If all else fails, test the PCM for proper signal reception.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is safe to drive. The only issue is that cruise control will not work. The vehicle's normal driving and braking functions are unaffected.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing a switch or sensor is usually inexpensive.