P0734 GMC Code - Transmission 4th Gear Ratio Incorrect
Quick Answer
The P0734 diagnostic trouble code (DTC) for GMC vehicles refers to "Transmission 4th Gear Ratio Incorrect." This code indicates that there is an issue with the transmission's ability to shift into 4th gear properly. Common causes include Low transmission fluid level, Dirty or contaminated transmission fluid, Worn-out clutch components. 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
- P0734 GMC indicates Transmission 4th Gear Ratio Incorrect.
- Common causes
- Common causes include Low transmission fluid level, Dirty or contaminated transmission fluid, Worn-out clutch components.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0734 GMC Description
The P0734 diagnostic trouble code (DTC) for GMC vehicles refers to "Transmission 4th Gear Ratio Incorrect." This code indicates that there is an issue with the transmission's ability to shift into 4th gear properly. The transmission control module (TCM) monitors the gear ratios while the vehicle is in operation. If it detects that the transmission is not shifting into 4th gear as it should, it will trigger the P0734 code.
Common Causes of P0734 GMC
- Low transmission fluid level
- Dirty or contaminated transmission fluid
- Worn-out clutch components
- Faulty transmission solenoid
- Issues with the transmission control module
Symptoms of P0734 GMC
- Harsh or delayed shifting
- Reduced fuel efficiency
- Engine revving higher than normal before shifting
- Transmission slipping
- Illuminated check engine light
How to Fix P0734 GMC
- Check and top up transmission fluid levels
- Perform a transmission fluid flush and filter replacement
- Inspect and replace worn-out clutch components
- Test and replace faulty transmission solenoid
- Reset TCM and perform a transmission relearn procedure
Cost to Fix P0734 GMC
The typical repair costs for addressing a P0734 transmission 4th gear ratio incorrect code can vary depending on the specific cause of the issue. On average, repairing this problem can range from $200 to $1000, including parts and labor. However, it's important to note that diagnosis time and labor rates can vary based on location, vehicle make and model, and the extent of the repairs needed. It's recommended to consult with a trusted auto repair shop for a more accurate estimate based on your individual circumstances.
Tech Notes for P0734 GMC
Need more information about the P0734 GMC code?
Need more information on how to fix the P0734 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0734 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P0734 2014 GMC Sierra — Transmission 4th Gear Ratio Incorrect
- P0734 2015 GMC Sierra — Transmission 4th Gear Ratio Incorrect
- P0734 2016 GMC Sierra — Transmission 4th Gear Ratio Incorrect
- P0734 2017 GMC Sierra — Transmission 4th Gear Ratio Incorrect
- P0734 2018 GMC Sierra — Transmission 4th Gear Ratio Incorrect
Frequently Asked Questions about P0734 GMC Code
No Frequently Asked Questions about P0734 GMC Code found.
Discuss the causes and fixes for P0734 GMC OBDII Code
Code P0734 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.