What does code P1581 mean?

Q: What does code P1581 mean?

Cruise Move Circuit High Voltage. P1581 on a GM vehicle means the engine control module (ECM) has detected an abnormally high voltage on the cruise control move circuit, which is the signal path used by the cruise control switches to command speed changes. The ECM expects a specific voltage range on this circuit and sets the code when the voltage stays above the acceptable threshold, indicating an open circuit, a short to voltage, or a faulty switch.

DTC codes / GM codes / P1581

P1581 · GMCruise Move Circuit High Voltage

P1581 on a GM vehicle means the engine control module (ECM) has detected an abnormally high voltage on the cruise control move circuit, which is the signal path used by the cruise control switches to command speed changes. The ECM expects a specific voltage range on this circuit and sets the code when the voltage stays above the acceptable threshold, indicating an open circuit, a short to voltage, or a faulty switch.

SystemPowertrain

Code typeGM specific

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.