P0732 2017 GMC Sierra Code - Transmission 2nd Gear 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
- P0732 2017 GMC Sierra indicates Transmission 2nd Gear 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 P0732 2017 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 gear ratio with 2nd gear commanded differs from the known 6th gear ratio for 2 s.
What are the Possible Causes of the DTC P0732 2017 GMC Sierra?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0732 2017 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 P0732 2017 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 P0732 2017 GMC Sierra Code
1. What does the OBDII code P0732 mean on a 2017 GMC Sierra?
P0732 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in 2nd gear, meaning the actual RPM does not match the expected RPM for that gear.
2. What are common symptoms of the P0732 code on a 2017 GMC Sierra?
Symptoms may include slipping in 2nd gear, harsh shifting, lack of acceleration, transmission overheating, or the check engine light being illuminated.
3. What causes the P0732 code on a 2017 GMC Sierra?
Common causes include low or dirty transmission fluid, a faulty shift solenoid, worn clutch packs, internal transmission damage, or issues with the transmission control module.
4. Can I drive my 2017 GMC Sierra with a P0732 code?
Driving with a P0732 code is not recommended, as it can lead to further transmission damage and potentially leave you stranded.
5. How do I diagnose the P0732 code on my 2017 GMC Sierra?
Diagnosis involves checking the transmission fluid level and condition, inspecting wiring and connectors to the transmission, testing shift solenoids, and performing a full transmission inspection if needed.
6. How can low transmission fluid cause a P0732 code?
Low fluid can prevent the transmission from maintaining proper hydraulic pressure, leading to improper gear engagement and incorrect gear ratios.
7. What repairs are commonly needed to fix the P0732 code?
Repairs may include replacing or cleaning the shift solenoid, flushing and refilling transmission fluid, repairing internal transmission components, or updating/reprogramming the TCM.
8. How much does it cost to fix the P0732 code on a 2017 GMC Sierra?
Costs vary widely but can range from $100 for a fluid flush to several thousand dollars for a full transmission rebuild or replacement, depending on the severity of the issue.
9. Can a faulty transmission control module cause the P0732 code?
Yes, a malfunctioning TCM can send incorrect signals to the transmission, leading to improper gear engagement and triggering the P0732 code.
10. How can I prevent the P0732 code from occurring on my 2017 GMC Sierra?
Regularly maintain your transmission by changing the fluid and filter as recommended, avoid overloading the vehicle, and address any transmission issues promptly to prevent further damage.
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