P0739 TCM Engine Speed ​​Output High

P0739 – OBD-II Trouble Code Technical Description

TCM Engine Speed ​​Output Circuit High

What does the fault code mean P0739?

Trouble code P0739 is a common diagnostic code for OBD-II equipped vehicles and can be found on different brands such as Dodge, Chevrolet, Honda, Toyota, Hyundai, Jaguar and others. This code indicates a problem with the engine speed sensor (ESS), also known as the crankshaft position sensor. ESS monitors engine speed and if its signal is stronger than expected, code P0739 will be activated. In most cases, this is due to an electrical problem, although mechanical problems are also possible but rare.

Possible reasons

Possible causes of a P0739 code may include:

1. Faulty Engine Speed ​​Sensor (ESS), also known as the crankshaft position sensor.
2. Faulty output speed sensor.
3. Broken, loose or corroded connectors.
4. Worn or shorted wiring.
5. Valve body or pressure problems.
6. Broken shift solenoid.
7. ECU (engine control module) failure.
8. Failure of the TCM (transmission control module).

These reasons can trigger the P0739 code and indicate a problem with the vehicle's transmission control system.

What are the symptoms of a fault code? P0739?

Symptoms of a P0739 trouble code may include:

1. Hard gear changes.
2. Reduced fuel efficiency.
3. Problems with starting the engine.
4. Limited driving speed.
5. The engine may jerk or stall.
6. Inadequate speedometer display.
7. Slow throttle response.

If these symptoms appear, it is recommended to check the operation of the indicator on the instrument panel, as well as pay attention to the gear shift characteristics and the engine to identify possible problems with the transmission.

How to diagnose a fault code P0739?

To resolve code P0739, it is recommended to perform the following steps:

1. Check the Engine Output Speed ​​(ESS) sensor as well as the crankshaft position sensor. Check that they are operating correctly and repair or replace as necessary.
2. Check the level and condition of the transmission fluid. If a lack of fluid is detected, top up and check for leaks. Replace contaminated fluid if necessary.
3. Inspect wiring and connectors for damage, corrosion, or breaks. Repair damaged wires and connectors.
4. Check valve body and transmission pressure. If problems are found, make the necessary adjustments or repairs.
5. Check the condition of the gear shift solenoids and their functionality. Replace broken solenoids.
6. Check the operation and condition of the TCM (Transmission Control Module). If any faults are found, replace or repair the module.

It is also a good idea to check for technical service bulletins (TSBs) for your vehicle to cover known fixes and manufacturer recommendations.

Diagnostic errors

Other common errors when diagnosing a P0739 code include:

1. Incorrect electrical connection: Connecting the Engine Output Speed ​​Sensor (ESS) or other sensors with incorrect polarity or short circuits may result in P0739.
2. Broken solenoids: Problems with the shift solenoids can cause incorrect signals and therefore P0739. Check their functionality and replace if necessary.
3. Output speed sensor problems: If the output speed sensor is not working properly, it can also cause P0739. Check the sensor and replace it if necessary.
4. Faulty TCM: The Transmission Control Module (TCM) may be the source of P0739. Check its condition and operation, and replace if it appears faulty.
5. Complex mechanical problems: Although less common, some serious mechanical problems, such as transmission damage, can also result in a P0739 code.

Please note that properly diagnosing and fixing the problem may require professional skills and equipment.

How serious is the fault code? P0739?

Trouble code P0739 indicates a problem with the engine speed sensor (ESS) or a circuit related to it. This problem can cause transmission roughness and other communication problems between the engine and transmission. Depending on the specific circumstances, the severity of this problem can range from mild to severe.

If the P0739 code leaves the vehicle running and does not cause significant driving or handling problems, it may be a less serious problem. However, if the problem results in significant difficulty driving the vehicle, skipping gears, degradation of performance, or other serious impairment, then it is a more serious situation.

In any case, it is recommended to immediately contact a professional mechanic for diagnosis and repair. Improper transmission operation can lead to expensive repairs and increased road safety risks, so neglecting this problem is not recommended.

What repair will help eliminate the code? P0739?

• Replace transmission fluid and filter
• Repair transmission fluid leak
• Replace engine speed output sensor
• Replace Transmission Output Speed ​​Sensor
• Repair or replace damaged wiring and/or connectors.
• Replace solenoids

What is P0739 Engine Code [Quick Guide]

P0739 – Brand-specific information

Trouble code P0739 is a generic code that can apply to different makes of vehicles. Here are some examples of decodings for specific brands:

1. Dodge: P0739 – Engine Output Speed ​​Sensor (ESS) signal too high.
2. Chevrolet: P0739 – Low signal from the engine speed sensor (ESS).
3. Sling: P0739 – Engine speed sensor (ESS) signal unstable.
4. Toyota: P0739 – The permissible signal level of the crankshaft position (CKP) sensor has been exceeded.
5. Hyundai: P0739 – Output Speed ​​Sensor (VSS) Circuit Error.

Please note that these are just examples and the meaning of the P0739 code may vary depending on the model and year of the vehicle. For accurate information and troubleshooting, you should consult your service manual or a professional mechanic.