P0736 2015 GMC Sierra 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 2015 GMC Sierra 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 2015 GMC Sierra 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 2015 GMC Sierra?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0736 2015 GMC Sierra?
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 2015 GMC Sierra 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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Frequently Asked Questions about P0736 2015 GMC Sierra Code
1. What does the OBDII code P0736 mean on a 2015 GMC Sierra?
P0736 indicates "Transmission Reverse Ratio Incorrect," meaning the transmission is not achieving the correct gear ratio when in reverse.
2. What are the common symptoms of code P0736 in a 2015 GMC Sierra?
Symptoms may include difficulty or inability to engage reverse gear, slipping in reverse, transmission warning lights, and reduced overall drivability.
3. What causes the P0736 code on a 2015 GMC Sierra?
Common causes include low or contaminated transmission fluid, a faulty valve body, damaged reverse gear components, internal transmission issues, or a malfunctioning transmission control module (TCM).
4. Can low transmission fluid trigger the P0736 code?
Yes, low or dirty transmission fluid can cause improper hydraulic pressure, leading to the incorrect reverse gear ratio.
5. How do you diagnose the P0736 code on a 2015 GMC Sierra?
Diagnosis involves checking the transmission fluid level and condition, inspecting for transmission leaks, scanning for related codes, and testing the transmission's internal components and sensors.
6. Can a faulty transmission speed sensor cause the P0736 code?
Yes, a malfunctioning input or output speed sensor can disrupt gear ratio calculations and trigger the P0736 code.
7. Is it safe to drive with the P0736 code on a 2015 GMC Sierra?
Driving with the P0736 code is not recommended, as it can lead to further transmission damage or complete failure.
8. How is the P0736 code fixed on a 2015 GMC Sierra?
Repairs may include replacing or repairing the reverse gear components, addressing internal transmission damage, replacing faulty speed sensors, or updating/reprogramming the TCM.
9. How much does it cost to repair the P0736 code on a 2015 GMC Sierra?
Repair costs vary widely depending on the issue, ranging from $100–$300 for minor fixes like sensor replacements to $2,000 or more for major transmission repairs.
10. Can resetting the check engine light fix the P0736 code on a 2015 GMC Sierra?
Simply resetting the light won’t fix the underlying issue. Proper diagnosis and repairs are necessary to resolve the code permanently.
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