Cruise Control Multi-Function Input Circuit High
The P0581 code indicates that the powertrain control module (PCM) has detected a voltage signal from the cruise control multi-function switch that is higher than the expected range. This typically points to a short to voltage in the circuit, a faulty switch, or a wiring issue. The multi-function switch integrates controls for set, resume, coast, and cancel functions. A high circuit condition can prevent the cruise control from engaging or cause erratic operation.
01. Most Common Causes
- Faulty cruise control multi-function switch
- Short to voltage in the cruise control switch circuit
- Damaged wiring or connector issues
- Corroded terminals or poor ground connection
- Failed PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control light on dash stays on or flashes
- Cruise control engages but cannot be adjusted
- Engine Check Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
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 with a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts to battery voltage or ground in the circuit.
Step 5: If wiring is intact, replace the cruise control multi-function switch.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but cruise control will not function properly. The vehicle's braking and steering are unaffected.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether the switch or wiring needs replacement.