P0736 GMC Code - Transmission Reverse Ratio Incorrect
Quick Answer
The transmission turbine speed sensor and vehicle speed sensor are hall-effect sensors. Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine 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
- P0736 GMC indicates Transmission Reverse Ratio Incorrect.
- Common causes
- Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine 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.
Code P0736 GMC Description
The TCM provides a 9 V reference circuit and a signal circuit to each of the sensors. As the 1-2-3-4-5-6 clutch piston housing and transmission output shaft or transfer case output rotates, the sensors produce a signal frequency based on the teeth on the reluctor wheel. The TCM calculates the transmission gear ratio based on the speed sensor signals and compares the calculated gear ratio to the commanded gear ratio.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the calculated reverse gear ratio differs from the known reverse gear ratio for 2 s.
What are the Possible Causes of the DTC P0736 GMC?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0736 GMC?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0736 GMC 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.
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Information for Specific GMC Models
- P0736 2014 GMC Sierra — Transmission Reverse Ratio Incorrect
- P0736 2015 GMC Sierra — Transmission Reverse Ratio Incorrect
- P0736 2016 GMC Sierra — Transmission Reverse Ratio Incorrect
- P0736 2017 GMC Sierra — Transmission Reverse Ratio Incorrect
- P0736 2018 GMC Sierra — Transmission Reverse Ratio Incorrect
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.
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