P0732 GMC 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 GMC 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 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 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 GMC?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0732 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 P0732 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
- P0732 2014 GMC Sierra — Transmission 2nd Gear Ratio Incorrect
- P0732 2015 GMC Sierra — Transmission 2nd Gear Ratio Incorrect
- P0732 2016 GMC Sierra — Transmission 2nd Gear Ratio Incorrect
- P0732 2017 GMC Sierra — Transmission 2nd Gear Ratio Incorrect
- P0732 2018 GMC Sierra — Transmission 2nd Gear Ratio Incorrect
Frequently Asked Questions about P0732 GMC Code
What does the OBD-II code P0732 mean on a GMC vehicle?
P0732 indicates that the transmission's control module has detected an incorrect gear ratio for 2nd gear, often caused by slipping or mechanical issues.
What are the common symptoms of P0732 in a GMC?
Symptoms include rough shifting, slipping gears, reduced acceleration, and the Check Engine Light being illuminated.
What causes the P0732 code in GMC vehicles?
Common causes include low transmission fluid, a faulty shift solenoid, worn clutch packs, or internal transmission damage.
Can driving with a P0732 code damage the transmission?
Yes, driving with this code can cause further damage to the transmission if the issue is not resolved promptly.
How can low transmission fluid lead to a P0732 code?
Low fluid levels can cause insufficient hydraulic pressure, leading to gear slippage and incorrect gear ratios.
How is the P0732 code diagnosed on a GMC?
Technicians typically check the transmission fluid condition, scan for related codes, test shift solenoids, and inspect internal transmission components.
What repairs can resolve a P0732 code on a GMC?
Repairs may include replacing the shift solenoid, repairing clutch packs, flushing and refilling transmission fluid, or rebuilding the transmission.
Can a faulty transmission control module cause a P0732 code?
Yes, a malfunctioning transmission control module can miscalculate gear ratios and trigger the P0732 code.
What should I check first if I get a P0732 code in my GMC?
Start by inspecting the transmission fluid level and condition, as this is often the simplest and most common issue.
Is resetting the Check Engine Light enough to fix P0732?
No, resetting the light will not fix the underlying issue causing the code; proper diagnosis and repair are necessary.
Discuss the causes and fixes for P0732 GMC OBDII Code
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