What does code P278B mean?

Q: What does code P278B mean?

Kick Down Switch Circuit Range/Performance. P278B indicates that the powertrain control module has detected an out-of-range or performance fault in the kick down switch circuit, which is the input used to trigger a forced downshift for passing or climbing. The computer monitors the switch signal and its wiring for expected voltage changes when the accelerator is pressed fully, and it sets this code when the signal does not behave as programmed.

DTC codes / P27xx · Transmission / P278B

P278BKick Down Switch Circuit Range/Performance

P278B indicates that the powertrain control module has detected an out-of-range or performance fault in the kick down switch circuit, which is the input used to trigger a forced downshift for passing or climbing. The computer monitors the switch signal and its wiring for expected voltage changes when the accelerator is pressed fully, and it sets this code when the signal does not behave as programmed.

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.