P0747 2018 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On
Quick Answer
The solenoid actuator controls fluid pressure by moving the clutch 1-2-3-4-5-6 regulator valve that controls the fluid pressure to the 1-2-3-4-5-6 clutch. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve. 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
- P0747 2018 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck On.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve.
- 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 P0747 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0747 2018 GMC Sierra?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Transmission Control Solenoid Valve
- Transmission Control Solenoid Valve harness is open or shorted
- Transmission Control Solenoid Valve circuit poor electrical connection
How to Fix the DTC P0747 2018 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 P0747 2018 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 P0747 2018 GMC Sierra Code
1. What does the OBDII code P0747 mean on a 2018 GMC Sierra?
P0747 indicates that the Transmission Control Solenoid Valve 1 is stuck in the "on" position, causing improper transmission operation.
2. What are the common symptoms of code P0747 in a 2018 GMC Sierra?
Symptoms may include harsh shifting, slipping gears, inability to shift gears, transmission overheating, or the vehicle going into limp mode.
3. What causes the P0747 code to appear on a 2018 GMC Sierra?
Possible causes include a faulty transmission control solenoid, low or dirty transmission fluid, wiring or connector issues, or internal transmission damage.
4. Can dirty transmission fluid cause the P0747 code on a 2018 GMC Sierra?
Yes, dirty or contaminated transmission fluid can cause the solenoid to stick, leading to the P0747 code.
5. How do you diagnose the P0747 code on a 2018 GMC Sierra?
Diagnosis involves scanning for additional codes, inspecting the transmission fluid condition, checking wiring and connectors, and testing the solenoid for proper operation.
6. Can I drive my 2018 GMC Sierra with the P0747 code active?
Driving with this code is not recommended, as it can cause further damage to the transmission and affect vehicle performance.
7. What is the cost to repair the P0747 code on a 2018 GMC Sierra?
Repair costs can vary but may range from $150 to $400 for solenoid replacement, or higher if internal transmission repairs are needed.
8. How is the P0747 code fixed on a 2018 GMC Sierra?
Repairs may involve replacing the faulty solenoid, flushing or replacing transmission fluid, repairing wiring, or addressing internal transmission issues.
9. Can a software update fix the P0747 code on a 2018 GMC Sierra?
In rare cases, a transmission control module (TCM) software update may resolve the issue, but mechanical causes are more common.
10. How can I prevent the P0747 code from recurring on my 2018 GMC Sierra?
Routine maintenance, such as regular transmission fluid changes and inspections, can help prevent solenoid-related issues.
Discuss the causes and fixes for P0747 2018 GMC Sierra OBDII Code
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