P0739 Code - TCM Engine Speed Output Circuit High
Quick Answer
The P0739 code is a diagnostic trouble code (DTC) that indicates a problem with the Transmission Control Module (TCM) Engine Speed Output Circuit being high. Common causes include Faulty TCM, Wiring issues in the engine speed output circuit, Malfunctioning engine speed sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0739 indicates TCM Engine Speed Output Circuit High.
- Common causes
- Common causes include Faulty TCM, Wiring issues in the engine speed output circuit, Malfunctioning engine speed sensor.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0739 Description
The P0739 code is a diagnostic trouble code (DTC) that indicates a problem with the Transmission Control Module (TCM) Engine Speed Output Circuit being high. The TCM is responsible for controlling the transmission's shifting behavior based on various inputs, including engine speed. When this specific circuit is reporting a high signal, it means that the TCM is receiving a voltage signal that is above the expected range. This can lead to issues with the transmission's performance, as the TCM may not be able to accurately control the shifting process.
Common Causes of P0739
- Faulty TCM
- Wiring issues in the engine speed output circuit
- Malfunctioning engine speed sensor
- Transmission issues
- Electrical problems
Symptoms of P0739
- Erratic shifting behavior
- Harsh shifting or slipping gears
- Decreased fuel efficiency
- Vehicle going into limp mode
- Illuminated check engine light
How to Fix P0739
- Connect a diagnostic scanner to read and record the fault codes stored in the TCM.
- Inspect the wiring in the engine speed output circuit for any signs of damage or corrosion.
- Test the engine speed sensor to ensure it is functioning properly.
- Check the TCM for any signs of damage or malfunction.
- Repair or replace any faulty components, such as the TCM, wiring, engine speed sensor, or transmission.
Cost to Fix P0739
The cost of repairing a P0739 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It is advisable to check with local auto repair shops for a more accurate estimate based on the specific vehicle make and model. Additionally, diagnostic time and labor rates can impact the overall cost, so it is recommended to inquire about these factors before proceeding with the repair.
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Frequently Asked Questions about P0739 Code
1. What are the common symptoms of OBDII code P0739 (TCM Engine Speed Output Circuit High)?
- Common symptoms include harsh shifting, slipping gears, reduced fuel efficiency, and illumination of the check engine light.
2. What typically causes the OBDII code P0739 to trigger?
- The code P0739 is usually triggered by a malfunction in the transmission control module (TCM) engine speed output circuit, such as a short circuit or open circuit.
3. How can I diagnose the root cause of OBDII code P0739?
- Diagnosing the root cause of P0739 involves checking the TCM engine speed sensor, inspecting the wiring for damage, and testing the TCM itself for proper functionality.
4. Can a faulty speed sensor cause OBDII code P0739 to appear?
- Yes, a faulty speed sensor can cause the TCM to detect a high engine speed output signal, triggering the P0739 code.
5. What are some repair tips for fixing OBDII code P0739?
- Repair tips may include repairing or replacing damaged wiring, replacing the faulty speed sensor, resetting the TCM, or seeking professional assistance for advanced diagnostics.
6. Is it safe to continue driving with OBDII code P0739 present?
- It is not recommended to continue driving with the P0739 code as it can lead to further damage to the transmission and other components if left unresolved.
7. Will resetting the check engine light clear OBDII code P0739?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.
8. Can a DIY enthusiast fix OBDII code P0739 at home?
- Depending on their skills and tools, some DIY enthusiasts may be able to fix P0739 at home by following repair guides and using diagnostic equipment to pinpoint the issue.
9. How much does it cost to repair OBDII code P0739 at a professional auto repair shop?
- The cost of repairing P0739 at a professional auto repair shop can vary widely based on the root cause, parts needed, labor rates, and local market prices.
10. Are there any preventive maintenance measures to avoid OBDII code P0739 in the future?
- Regularly servicing the transmission, inspecting wiring for damage, and addressing any issues promptly can help prevent the recurrence of OBDII code P0739 in the future.
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