AutoCodes – Generic – P0739

P0739 Code - TCM Engine Speed Output Circuit High

Quick Answer

The Transmission Control Module (TCM) monitors the engine speed signal through the engine output speed sensor (turbine sensor). Common causes include Faulty Engine Output Speed Sensor, Engine Output Speed Sensor harness is open or shorted, Engine Output Speed Sensor circuit poor electrical connection. 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 Engine Output Speed Sensor, Engine Output Speed Sensor harness is open or shorted, Engine Output Speed Sensor circuit poor electrical connection.
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 Popularity 3,784

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0739 Description

The Transmission Control Module (TCM) monitors the engine speed signal through the engine output speed sensor (turbine sensor). The TCM sets the OBDII code when the engine speed sensor signal is not to factory specifications.

OBDII Code P0739 - TCM Engine Speed Output Circuit High - AutoCodes.com — P0739 Code - TCM Engine Speed Output Circuit High

What does this mean?

What are the Possible Causes of the DTC P0739?

Faulty Engine Output Speed Sensor
Engine Output Speed Sensor harness is open or shorted
Engine Output Speed Sensor circuit poor electrical connection
Faulty Crank Shaft Position Sensor

How to Fix the DTC P0739?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0739 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0739 code?

Need more information on how to fix the P0739 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0739 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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.