What does code P2780 mean?

Q: What does code P2780 mean?

Downshift Switch Circuit Low. P2780 indicates that the powertrain control module (PCM) has detected a low voltage condition on the downshift switch circuit, which is part of the automatic transmission's manual shift control system. The PCM expects the switch to pull the signal voltage high when the driver requests a downshift, but the circuit remains at or near ground, signaling a short to ground or a failed switch.

DTC codes / P27xx · Transmission / P2780

P2780Downshift Switch Circuit Low

P2780 indicates that the powertrain control module (PCM) has detected a low voltage condition on the downshift switch circuit, which is part of the automatic transmission's manual shift control system. The PCM expects the switch to pull the signal voltage high when the driver requests a downshift, but the circuit remains at or near ground, signaling a short to ground or a failed switch.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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