P0734 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0734 Chevrolet?
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 Chevrolet 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 Chevrolet Models
- P0734 2014 Chevrolet Silverado — Transmission 4th Gear Ratio Incorrect
- P0734 2015 Chevrolet Silverado — Transmission 4th Gear Ratio Incorrect
- P0734 2016 Chevrolet Silverado — Transmission 4th Gear Ratio Incorrect
- P0734 2017 Chevrolet Silverado — Transmission 4th Gear Ratio Incorrect
- P0734 2018 Chevrolet Silverado — Transmission 4th Gear Ratio Incorrect
Frequently Asked Questions about P0734 Chevrolet Code
1. What does the OBDII code P0734 mean on a Chevrolet?
P0734 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in 4th gear, meaning the input and output speeds don't align as expected.
2. What are the common symptoms of P0734 in a Chevrolet?
Symptoms may include difficulty shifting gears, slipping in 4th gear, erratic transmission behavior, reduced power, and the check engine light being illuminated.
3. What causes the P0734 code to appear in a Chevrolet?
Common causes include low or dirty transmission fluid, internal transmission issues like clutch problems, a malfunctioning solenoid, or a damaged torque converter.
4. Can driving with a P0734 code damage my Chevrolet?
Yes, continuing to drive with this code can cause further damage to the transmission, leading to more expensive repairs if not addressed promptly.
5. How do I fix a P0734 code on my Chevrolet?
Repairs may involve checking and replacing the transmission fluid, inspecting and replacing faulty solenoids, repairing or rebuilding the transmission, or addressing electrical issues in the TCM.
6. Can low transmission fluid cause the P0734 code on a Chevrolet?
Yes, low or contaminated transmission fluid can lead to improper gear engagement and cause the P0734 code to be triggered.
7. How is the P0734 code diagnosed in a Chevrolet?
A mechanic will use a scan tool to confirm the code, inspect the transmission fluid condition, check for related codes, and test the transmission's mechanical and electrical components.
8. Is the P0734 code specific to Chevrolet vehicles?
No, the P0734 code is a generic OBDII code that can appear in vehicles of various makes, but troubleshooting steps may vary slightly between brands.
9. How much does it cost to repair a P0734 code in a Chevrolet?
Repair costs vary, ranging from $100 for a fluid change to $3,000 or more for a full transmission rebuild, depending on the underlying issue.
10. Can a faulty TCM cause the P0734 code on a Chevrolet?
Yes, a malfunctioning transmission control module can misinterpret or send incorrect signals, causing the P0734 code to appear.
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