P0734 2016 GMC Sierra Code - Transmission 4th 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
- P0734 2016 GMC Sierra indicates Transmission 4th 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 P0734 2016 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 4th gear commanded differs from the known 6th gear ratio for 2 s.
What are the Possible Causes of the DTC P0734 2016 GMC Sierra?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0734 2016 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 P0734 2016 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 P0734 2016 GMC Sierra Code
1. What does the OBDII code P0734 mean for a 2016 GMC Sierra?
P0734 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in 4th gear, which can signal an issue with the transmission or related components.
2. What are the common symptoms of the P0734 code in a 2016 GMC Sierra?
Symptoms may include a slipping or hard shift into 4th gear, poor acceleration, reduced fuel efficiency, the check engine light turning on, and the vehicle going into limp mode.
3. What causes the P0734 code in a 2016 GMC Sierra?
Common causes include low or dirty transmission fluid, a malfunctioning shift solenoid, worn or damaged clutches, a faulty transmission control module (TCM), or internal transmission problems.
4. Can low transmission fluid cause the P0734 code?
Yes, low or contaminated transmission fluid can cause improper gear ratios, leading to the P0734 code.
5. How is the P0734 code diagnosed in a 2016 GMC Sierra?
A technician will typically check the transmission fluid level and condition, scan for additional codes, inspect the wiring and connectors, and perform pressure tests or internal transmission inspections.
6. Can I drive my 2016 GMC Sierra with the P0734 code?
Driving with the P0734 code is not recommended, as it can cause further damage to the transmission or leave you stranded if the vehicle enters limp mode.
7. How do you fix the P0734 code on a 2016 GMC Sierra?
Repairs may include replacing or refilling the transmission fluid, repairing or replacing damaged wiring, replacing a faulty shift solenoid, or rebuilding the transmission if internal damage is found.
8. How much does it cost to repair the P0734 code for a 2016 GMC Sierra?
Costs vary depending on the issue. Minor fixes like fluid replacement may cost $100–$300, while transmission repairs or rebuilds can cost $1,500–$4,000.
9. Can a bad shift solenoid cause the P0734 code?
Yes, a faulty shift solenoid can prevent proper engagement of 4th gear, leading to an incorrect gear ratio and triggering the P0734 code.
10. How can I prevent the P0734 code in my 2016 GMC Sierra?
Regularly check and maintain transmission fluid levels, follow the manufacturer's recommended service intervals, and address any transmission issues promptly to prevent further damage.
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