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P0732 2015 GMC Sierra Code - Transmission 2nd Gear Ratio Incorrect

Quick Answer

The P0732 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the transmission's second gear ratio is incorrect. Common causes include Low transmission fluid level or poor quality fluid, Faulty transmission solenoid, Malfunctioning transmission speed sensors. 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 2015 GMC Sierra indicates Transmission 2nd Gear Ratio Incorrect.
Common causes
Common causes include Low transmission fluid level or poor quality fluid, Faulty transmission solenoid, Malfunctioning transmission speed sensors.
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 15, 2024
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Code P0732 2015 GMC Sierra Description

The P0732 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the transmission's second gear ratio is incorrect. This means that the transmission is not shifting into second gear properly, which can lead to a variety of performance issues. The transmission control module (TCM) monitors the gear ratios during operation, and when it detects that the actual gear ratio does not match the expected ratio for second gear, it triggers this code.

OBDII Code P0732 2015 GMC Sierra - Transmission 2nd Gear Ratio Incorrect
P0732 2015 GMC Sierra Code - Transmission 2nd Gear Ratio Incorrect

Common Causes of P0732 2015 GMC Sierra

  1. Low transmission fluid level or poor quality fluid
  2. Faulty transmission solenoid
  3. Malfunctioning transmission speed sensors
  4. Internal transmission mechanical issues
  5. TCM software glitches or calibration errors

Symptoms of P0732 2015 GMC Sierra

  1. Delayed or harsh shifting between gears
  2. Slipping or flaring during acceleration
  3. Reduced fuel efficiency
  4. Engine revving higher than normal before shifting
  5. Illumination of the Check Engine Light

How to Fix P0732 2015 GMC Sierra

  1. Begin by checking the transmission fluid level and quality. Top off or replace the fluid if necessary.
  2. Inspect and test the transmission solenoid to ensure it is functioning correctly. Replace if faulty.
  3. Test the transmission speed sensors for proper operation. Replace any sensors that are malfunctioning.
  4. Perform a thorough diagnostic of the transmission components to identify any internal mechanical issues. Repair or replace damaged components as needed.
  5. Update the TCM software or recalibrate the transmission control module to ensure proper gear ratio detection and shifting.

Cost to Fix P0732 2015 GMC Sierra

The cost of repairing a P0732 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair costs for this type of transmission problem can range from $200 to $1000, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on the severity of the issue and the extent of repairs needed. Additionally, labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on your vehicle's specific circumstances.

What does this mean?

Tech Notes for P0732 2015 GMC Sierra

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.

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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 P0732 2015 GMC Sierra Code

1. What does the OBDII code P0732 mean on a 2015 GMC Sierra?

P0732 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in 2nd gear, which suggests a potential issue with the transmission or related components.

2. What are the common symptoms of code P0732 in a 2015 GMC Sierra?

Symptoms may include slipping or difficulty shifting into 2nd gear, poor acceleration, reduced fuel efficiency, transmission overheating, or the illumination of the check engine light.

3. What causes the P0732 code to appear on a 2015 GMC Sierra?

Common causes include low transmission fluid, a faulty shift solenoid, damaged wiring or connectors, a worn clutch pack, or internal transmission issues such as gear damage.

4. Can low transmission fluid cause the P0732 code in a 2015 GMC Sierra?

Yes, low or dirty transmission fluid can cause improper hydraulic pressure, leading to an incorrect gear ratio in 2nd gear and triggering the P0732 code.

5. How do you diagnose the P0732 code on a 2015 GMC Sierra?

Diagnosis typically involves checking the transmission fluid level and condition, inspecting wiring and connectors, testing the shift solenoids, and potentially performing a pressure test or internal transmission inspection.

6. Can driving with the P0732 code damage the transmission on a 2015 GMC Sierra?

Yes, continuing to drive with this code can lead to further damage, especially if it’s caused by low fluid, slipping gears, or internal transmission problems.

7. What repairs might fix the P0732 code on a 2015 GMC Sierra?

Repairs could include topping off or replacing transmission fluid, repairing or replacing faulty shift solenoids, fixing damaged wiring, or rebuilding the transmission if internal components are worn.

8. How much does it cost to fix the P0732 code on a 2015 GMC Sierra?

Repair costs vary widely depending on the cause, ranging from $100-$300 for fluid changes or solenoid replacements to $1,000 or more for internal transmission repairs.

9. Can a bad speed sensor trigger the P0732 code in a 2015 GMC Sierra?

Yes, a faulty input or output speed sensor can send incorrect data to the TCM, leading to gear ratio errors like the P0732 code.

10. Is the P0732 code a serious issue for a 2015 GMC Sierra?

Yes, this code indicates a transmission problem that should be addressed promptly to avoid further damage or unsafe driving conditions.

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