What does code P1588 mean?

Q: What does code P1588 mean?

Cruise Control Clutch Control Circuit High. P1588 on a GM vehicle means the powertrain control module (PCM) has detected an abnormally high voltage on the cruise control clutch control circuit, which is the wire that tells the PCM when the clutch pedal is pressed so it can disengage cruise control. The PCM expects a specific voltage range on this circuit and flags the code when the signal stays above the high threshold, indicating an open circuit, a short to voltage, or a faulty switch.

DTC codes / GM codes / P1588

P1588 · GMCruise Control Clutch Control Circuit High

P1588 on a GM vehicle means the powertrain control module (PCM) has detected an abnormally high voltage on the cruise control clutch control circuit, which is the wire that tells the PCM when the clutch pedal is pressed so it can disengage cruise control. The PCM expects a specific voltage range on this circuit and flags the code when the signal stays above the high 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.