What does code P1701 mean?

Q: What does code P1701 mean?

MIL Request Circuit - Transmission. P1701 on a GM vehicle means the transmission control module (TCM) has detected a fault in the malfunction indicator lamp (MIL) request circuit, which is the communication line the TCM uses to ask the engine control module (ECM) to turn on the check engine light for transmission-related problems. The TCM monitors this circuit and sets the code when the voltage or signal does not match expected values, indicating an open, short, or communication failure.

DTC codes / GM codes / P1701

P1701 · GMMIL Request Circuit - Transmission

P1701 on a GM vehicle means the transmission control module (TCM) has detected a fault in the malfunction indicator lamp (MIL) request circuit, which is the communication line the TCM uses to ask the engine control module (ECM) to turn on the check engine light for transmission-related problems. The TCM monitors this circuit and sets the code when the voltage or signal does not match expected values, indicating an open, short, or communication failure.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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