Close

OBD II Fault Code

  • OBD II P0739

OBD-II Code Transmission may not shift properly is defined as a TCM Engine Speed Output Circuit High

The Engine Speed Sensor tells the Transmission Control Module (TCM) how fast the engine is spinning so the correct gear can be engaged. When the TCM receives an inaccurate signal from this sensor, it can't properly shift the vehicle from gear to gear as the vehicle needs to change speed and rates of acceleration. Most vehicles use the crankshaft position sensor for this information. The engine control module (PCM) or TCM will set code P0739.

Transmission may not shift properly Symptoms

  • Increased fuel consumption
  • Transmission may not shift properly

Common Problems That Trigger the P0739 Code

  • Crankshaft Position Sensor (CKP) failure
  • Powertrain Control Module (PCM) failure
  • Transmission Control Module (TCM) failure
  • Wiring issue

Common Repairs Needed for the P0739 Code

Not the OBD-II Code You're Looking For?

No comments yet…

Sign in to comment