Engine-Codes.com
Engine-Codes – GMC – P0736 GMC

P0736 GMC Code - Transmission Reverse Ratio Incorrect

Quick Answer

The P0736 code for GMC vehicles indicates that the transmission reverse ratio is incorrect. Common causes include Faulty transmission control module, Malfunctioning reverse gear sensor, Low transmission fluid levels or contaminated fluid. 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
P0736 GMC indicates Transmission Reverse Ratio Incorrect.
Common causes
Common causes include Faulty transmission control module, Malfunctioning reverse gear sensor, Low transmission fluid levels or contaminated fluid.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0736 GMC Description

The P0736 code for GMC vehicles indicates that the transmission reverse ratio is incorrect. This means that the transmission is not shifting properly into reverse gear, which can lead to various performance issues. When this code is triggered, the vehicle's onboard computer detects that the gear ratios in the transmission do not match the manufacturer's specifications for reverse gear. This can result in difficulty or inability to engage reverse gear, harsh shifting, slipping gears, or even complete transmission failure.

OBDII Code P0736 GMC - Transmission Reverse Ratio Incorrect
P0736 GMC Code - Transmission Reverse Ratio Incorrect

Common Causes of P0736 GMC

  1. Faulty transmission control module.
  2. Malfunctioning reverse gear sensor.
  3. Low transmission fluid levels or contaminated fluid.
  4. Mechanical damage or wear within the transmission.
  5. Electrical issues such as damaged wiring or connectors.

Symptoms of P0736 GMC

  1. Difficulty engaging or shifting into reverse gear.
  2. Harsh or delayed shifting when attempting to reverse.
  3. Slipping gears or sudden loss of power while in reverse.
  4. Unusual noises coming from the transmission.
  5. Illumination of the Check Engine Light.

How to Fix P0736 GMC

  1. Perform a comprehensive diagnostic scan to retrieve the specific error codes and pinpoint the exact cause of the incorrect reverse ratio.
  2. Inspect the transmission fluid level and condition, topping off or replacing fluid as necessary.
  3. Check and test the transmission control module and reverse gear sensor for proper function, replacing any faulty components.
  4. Inspect the transmission for any mechanical damage or wear, repairing or replacing damaged parts as needed.
  5. Clear the error codes, reset the transmission adaptives, and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0736 GMC

The cost of repairing a P0736 code for a GMC vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. Typically, the repair costs for this type of transmission issue can range from $200 to $1000 or more, including parts and labor. It is important to consider that the actual cost may be higher or lower based on the location, the vehicle's make and model, and the labor rates of the auto repair shop. Customers are advised to obtain multiple quotes from reputable repair shops to get a more accurate estimate.

What does this mean?

Tech Notes for P0736 GMC

Incorrect ratio Diagnostic Trouble Code (DTC) may indicate a component condition with piston seals, clutch plates, or solenoids or it may be caused by a faulty turbine or output speed sensor signal.

Need more information about the P0736 GMC code?

Need more information on how to fix the P0736 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0736 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 P0736 GMC Code

1. What does the OBDII code P0736 mean on a GMC?

P0736 indicates that the transmission reverse ratio is incorrect, meaning the gear ratio in reverse is not matching the expected value set by the vehicle's computer.

2. What are common symptoms of code P0736 on a GMC?

Symptoms may include difficulty shifting into reverse, no reverse gear engagement, transmission slippage, and the activation of the check engine light.

3. What causes the P0736 code on a GMC vehicle?

Possible causes include low transmission fluid, damaged reverse gear components, faulty shift solenoids, or issues with the transmission control module (TCM).

4. Can driving with code P0736 damage my GMC’s transmission?

Yes, driving with this code can lead to further transmission damage, especially if the issue involves low fluid levels or internal mechanical problems.

5. How can I diagnose the P0736 code on a GMC?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors to the TCM, and using a scan tool to monitor shift solenoid operations and gear ratios.

6. How do I fix the P0736 code on a GMC?

Repairs may include topping off or replacing transmission fluid, replacing damaged reverse gear components, repairing wiring or connectors, or replacing faulty solenoids.

7. Could low transmission fluid cause the P0736 code on a GMC?

Yes, insufficient or degraded transmission fluid can lead to incorrect gear ratios, including reverse gear problems.

8. Do I need to replace the transmission for the P0736 code?

Not always; many issues causing this code can be resolved through repairs to solenoids, fluid levels, or sensors without requiring a full transmission replacement.

9. Is the P0736 code more common in older GMC models?

Yes, older GMC vehicles may be more prone to this code due to wear and tear on transmission components and fluid degradation.

10. How much does it cost to repair the P0736 code on a GMC?

Repair costs vary depending on the cause but can range from $150 to $2,500, depending on whether minor repairs or a transmission rebuild is needed.

Discuss the causes and fixes for P0736 GMC OBDII Code

Submit a New Comment

Code P0736 GMC comments

No comments found for this page.