P0739 OBD-II: TCM Engine Speed Output Circuit High
P0739 Severity
Will P0739 go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P0739?
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.
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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
Ask our experts about P0739.
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