P0731 2018 Chevrolet Silverado Code - Transmission 1st 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
- P0731 2018 Chevrolet Silverado indicates Transmission 1st 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 P0731 2018 Chevrolet Silverado 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 1st gear commanded differs from the known 1st gear ratio for 2 s.
What are the Possible Causes of the DTC P0731 2018 Chevrolet Silverado?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0731 2018 Chevrolet Silverado?
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 P0731 2018 Chevrolet Silverado 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 P0731 2018 Chevrolet Silverado Code
What does OBDII code P0731 mean for a 2018 Chevrolet Silverado?
P0731 indicates that the transmission is experiencing an incorrect gear ratio in 1st gear, which typically points to a problem with the transmission system or related components.
What are the common symptoms of code P0731 in a 2018 Chevrolet Silverado?
Symptoms may include difficulty shifting gears, slipping in 1st gear, poor acceleration, and the Check Engine Light being illuminated.
What causes code P0731 in a 2018 Chevrolet Silverado?
Common causes include low transmission fluid, a faulty transmission control module (TCM), damaged clutch components, or worn gear sets.
Can driving with code P0731 damage my 2018 Chevrolet Silverado?
Yes, driving with this code can cause further transmission damage and lead to higher repair costs if not addressed promptly.
How can I diagnose code P0731 in a 2018 Chevrolet Silverado?
Start by checking the transmission fluid level and condition, inspecting wiring and connectors, and using a scan tool to monitor transmission sensor data.
Is low transmission fluid a possible cause of code P0731?
Yes, low or contaminated transmission fluid can result in improper operation of the transmission and trigger this code.
Can a faulty transmission speed sensor cause code P0731?
Yes, a malfunctioning input or output speed sensor can provide incorrect data to the TCM, leading to an incorrect gear ratio error.
How much does it cost to fix code P0731 in a 2018 Chevrolet Silverado?
Repair costs vary depending on the cause, ranging from $100 for a fluid change to $1,000 or more for transmission repairs or replacements.
Can resetting the Check Engine Light fix code P0731?
No, simply clearing the code won't fix the underlying issue. Proper diagnosis and repair are necessary to resolve the problem.
Should I take my 2018 Chevrolet Silverado to a professional for code P0731?
If you're not experienced with transmission diagnostics and repairs, it's recommended to seek help from a qualified mechanic or transmission specialist.
Discuss the causes and fixes for P0731 2018 Chevrolet Silverado OBDII Code
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