What does code P278A mean?

Q: What does code P278A mean?

Kick Down Switch Circuit. P278A indicates that the powertrain control module (PCM) has detected an abnormal condition in the kick down switch circuit, which is used to signal a forced downshift for passing or climbing. The computer monitors the circuit for expected voltage changes when the switch is pressed and sets this code when the signal is missing, stuck, or out of range.

DTC codes / P27xx · Transmission / P278A

P278AKick Down Switch Circuit

P278A indicates that the powertrain control module (PCM) has detected an abnormal condition in the kick down switch circuit, which is used to signal a forced downshift for passing or climbing. The computer monitors the circuit for expected voltage changes when the switch is pressed and sets this code when the signal is missing, stuck, or out of range.

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.