P0747 2018 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On
Quick Answer
The P0747 code on a 2018 GMC Sierra indicates that the Transmission Control Solenoid Valve 1 is stuck in the on position. Common causes include Electrical issues in the solenoid circuit, Mechanical obstructions preventing valve movement, Internal wear and tear on the 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 Electrical issues in the solenoid circuit, Mechanical obstructions preventing valve movement, Internal wear and tear on the 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.
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Code P0747 2018 GMC Sierra Description
The P0747 code on a 2018 GMC Sierra indicates that the Transmission Control Solenoid Valve 1 is stuck in the on position. The transmission control solenoid valves are vital components in automatic transmissions, responsible for regulating the flow of transmission fluid to control gear shifting. When Solenoid Valve 1 is stuck in the on position, it can lead to various issues with the transmission system's operation.
Common Causes of P0747 2018 GMC Sierra
- Electrical issues in the solenoid circuit
- Mechanical obstructions preventing valve movement
- Internal wear and tear on the solenoid valve
- Contaminated transmission fluid
- Faulty transmission control module
Symptoms of P0747 2018 GMC Sierra
- Erratic shifting patterns
- Harsh gear engagement
- Transmission slipping
- Decreased fuel efficiency
- Inability to shift gears
How to Fix P0747 2018 GMC Sierra
- Conduct a diagnostic scan to confirm the P0747 code and identify any other related codes.
- Inspect the transmission control solenoid valve 1 for any visible damage or obstructions.
- Test the electrical circuit connected to the solenoid valve for continuity and proper voltage.
- Replace the transmission control solenoid valve 1 if it is found to be faulty.
- Clear the diagnostic trouble codes, test drive the vehicle, and re-scan to ensure the issue has been resolved.
Cost to Fix P0747 2018 GMC Sierra
The typical repair costs for addressing a P0747 code on a 2018 GMC Sierra can range from $200 to $500, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
Tech Notes for P0747 2018 GMC Sierra
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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.
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