P0581 Cruise Control Multi Function Input A Circuit High

Definition: The OBD2 code P0581 indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the cruise control multi-function input “A” circuit. This typically involves an issue with the cruise control switch or related wiring.

P0581 – Cruise Control Multi-Function Input A Circuit High

Typical Severity: Moderate

Common Causes

P0581 – Cruise Control Multi-Function Input A Circuit High

Common causes include:

• Faulty cruise control switch
• Short circuit in the cruise control system wiring
• Corroded or damaged connectors in the cruise control circuit
• Defective cruise control module

 

Common Misdiagnosis

OBD2 Code: P0581

Description: Cruise Control Multi-Function Input A Circuit High

Common Misdiagnosis: Replacing the cruise control switch without checking for wiring issues or a faulty clock spring.

 

Common Diagnostic Steps

OBD2 Code: P0581

Description: Cruise Control Multi-Function Input A Circuit High

• Check the cruise control switch for proper operation and ensure it is not stuck or damaged.
• Inspect the wiring and connectors related to the cruise control system for any signs of damage, corrosion, or disconnection.
• Test the voltage at the cruise control switch using a multimeter to verify if it is within manufacturer specifications.
• Examine the fuse associated with the cruise control circuit and replace if necessary.
• Use an OBD2 scanner to clear the code and perform a test drive to see if it returns.
• If applicable, check for any technical service bulletins (TSBs) related to this issue for your specific vehicle model.
• If all else fails, consider consulting with a professional mechanic or dealership for further diagnosis and repair.