What does code P1790 mean?

Q: What does code P1790 mean?

TCM A/T TP Sensor Circuit Fault. P1790 on Honda vehicles means the Transmission Control Module (TCM) has detected a fault in the Automatic Transmission (A/T) Throttle Position (TP) sensor circuit. The TCM monitors the throttle position signal it receives and flags this code when the voltage or signal behavior falls outside the expected range during key-on or running conditions. This circuit tells the transmission how far the accelerator is pressed so shift points and line pressure can be scheduled correctly.

DTC codes / Honda codes / P1790

P1790 · HondaTCM A/T TP Sensor Circuit Fault

P1790 on Honda vehicles means the Transmission Control Module (TCM) has detected a fault in the Automatic Transmission (A/T) Throttle Position (TP) sensor circuit. The TCM monitors the throttle position signal it receives and flags this code when the voltage or signal behavior falls outside the expected range during key-on or running conditions. This circuit tells the transmission how far the accelerator is pressed so shift points and line pressure can be scheduled correctly.

SystemPowertrain

Code typeHonda specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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