What does code P1660 mean?

Q: What does code P1660 mean?

Cooling Fans Control Circuit. P1660 on a GM vehicle means the powertrain control module (PCM) has detected a fault in the cooling fan control circuit, which is the wiring and relay path the PCM uses to turn the engine cooling fans on and off. The PCM monitors the control circuit for expected voltage or current feedback and sets this code when the circuit does not respond as commanded.

DTC codes / GM codes / P1660

P1660 · GMCooling Fans Control Circuit

P1660 on a GM vehicle means the powertrain control module (PCM) has detected a fault in the cooling fan control circuit, which is the wiring and relay path the PCM uses to turn the engine cooling fans on and off. The PCM monitors the control circuit for expected voltage or current feedback and sets this code when the circuit does not respond as commanded.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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