OBD II Fault Code

  • OBD II P278B

OBD-II Code Decreased engine performance is defined as a Kick Down Switch Circuit Range/Performance

The kick down switch tells the transmission when to downshift the transmission so the vehicle can accelerate faster. If the kickdown switch sends an implausible signal to the transmission control module (TCM), code P278B will be stored.

Decreased engine performance Symptoms

  • Decreased engine performance

Common Problems That Trigger the P278B Code

  • Kick down switch failure
  • Transmission Control Module (TCM) failure
  • Wiring issue
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