Cruise Control Multi-Function Input Circuit Low
The P0592 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the cruise control multi-function input circuit. This circuit receives signals from the cruise control switches (set, resume, cancel, etc.) and if the voltage is below the expected range, the PCM disables cruise control. Common causes include a faulty cruise control switch, damaged wiring, poor electrical connections, or a malfunctioning PCM.
01. Most Common Causes
- Faulty cruise control switch
- Damaged or shorted wiring in the cruise control circuit
- Poor electrical connection or corrosion at the switch or PCM
- Malfunctioning PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control light on the dashboard may illuminate or flash
- Engine Check Light (CEL) illuminated
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for any other related codes.
Step 2: Visually inspect the cruise control switch and wiring for damage, corrosion, or loose connections.
Step 3: Test the voltage at the cruise control switch connector using a multimeter; compare with manufacturer specifications.
Step 4: If voltage is low, check the circuit for shorts or opens; repair or replace as needed.
Step 5: If wiring and switch are okay, test the PCM input; replace PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is safe to drive, but cruise control will not function. The vehicle will operate normally otherwise.
How much does it cost to fix?▼
Typically between $50 and $150 for diagnosis and repair, depending on the cause. Switch replacement is usually under $100.