What does code P1791 mean?

Q: What does code P1791 mean?

TP Electric Circuit. P1791 on Nissan vehicles indicates that the Transmission Control Module (TCM) has detected an electrical fault in the Throttle Position (TP) sensor circuit, which it uses to manage shift quality and line pressure. The TCM monitors the TP signal for expected voltage or rationality and sets this code when the signal is out of range, intermittent, or missing.

DTC codes / Nissan codes / P1791

P1791 · NissanTP Electric Circuit

P1791 on Nissan vehicles indicates that the Transmission Control Module (TCM) has detected an electrical fault in the Throttle Position (TP) sensor circuit, which it uses to manage shift quality and line pressure. The TCM monitors the TP signal for expected voltage or rationality and sets this code when the signal is out of range, intermittent, or missing.

SystemPowertrain

Code typeNissan specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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