P0747 GMC Code - Transmission Control Solenoid Valve 1 Stuck On
Quick Answer
The P0747 GMC code indicates that the Transmission Control Solenoid Valve 1 is stuck in the on position. Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical connection problems, Transmission control module malfunction. 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 GMC indicates Transmission Control Solenoid Valve 1 Stuck On.
- Common causes
- Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical connection problems, Transmission control module malfunction.
- 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 GMC Description
The P0747 GMC code indicates that the Transmission Control Solenoid Valve 1 is stuck in the on position. The transmission control solenoid valves are responsible for regulating the flow of transmission fluid within the transmission. When the solenoid valve is stuck on, it can cause issues with shifting gears, leading to poor vehicle performance and potential damage to the transmission system.
Common Causes of P0747 GMC
- Faulty transmission control solenoid valve
- Wiring issues or electrical connection problems
- Transmission control module malfunction
- Low transmission fluid levels
- Internal transmission damage
Symptoms of P0747 GMC
- Rough or delayed shifting between gears
- Stuck in one gear
- Decreased fuel efficiency
- Illumination of the Check Engine Light
- Transmission slipping
How to Fix P0747 GMC
- Diagnose the specific cause of the code using a professional diagnostic tool.
- Inspect the transmission control solenoid valve for any signs of damage or wear.
- Check the wiring and electrical connections for any loose connections or corrosion.
- Replace the faulty transmission control solenoid valve if necessary.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0747 GMC
The cost of repairing a Transmission Control Solenoid Valve 1 Stuck On issue can vary depending on the make and model of the vehicle, as well as the specific cause of the problem. On average, the parts for this repair can range from $100 to $300, while the labor costs can range from $150 to $300. Therefore, the total cost for this repair could be anywhere from $250 to $600. It is recommended to consult with a professional mechanic to get an accurate estimate based on your specific vehicle and location.
Tech Notes for P0747 GMC
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Information for Specific GMC Models
- P0747 2014 GMC Sierra — Transmission Control Solenoid Valve 1 Stuck On
- P0747 2015 GMC Sierra — Transmission Control Solenoid Valve 1 Stuck On
- P0747 2016 GMC Sierra — Transmission Control Solenoid Valve 1 Stuck On
- P0747 2017 GMC Sierra — Transmission Control Solenoid Valve 1 Stuck On
- P0747 2018 GMC Sierra — Transmission Control Solenoid Valve 1 Stuck On
Frequently Asked Questions about P0747 GMC Code
1. What does the OBDII code P0747 mean on a GMC vehicle?
P0747 indicates that the Transmission Control Solenoid Valve 1 is stuck in the "on" position, causing improper operation of the transmission.
2. What are the common symptoms of code P0747 in a GMC?
Symptoms may include harsh shifting, transmission slippage, failure to engage certain gears, reduced fuel efficiency, and the Check Engine Light being illuminated.
3. What causes the P0747 code on a GMC?
Common causes include a faulty transmission control solenoid, low or dirty transmission fluid, internal transmission damage, or issues in the wiring or connectors related to the solenoid.
4. Can I drive my GMC with a P0747 code?
Driving with this code is not recommended as it can cause further damage to the transmission and result in unsafe driving conditions.
5. How is code P0747 diagnosed on a GMC?
A technician will use a scan tool to verify the code, inspect the transmission fluid, test the solenoid's electrical circuit, and perform a pressure test if necessary.
6. How do I fix code P0747 on my GMC?
Repairs may include replacing the stuck solenoid, changing the transmission fluid and filter, repairing wiring issues, or addressing internal transmission damage.
7. How much does it cost to repair a P0747 code on a GMC?
The cost varies but can range from $150 to $400 for solenoid replacement, with higher costs if internal transmission repairs are required.
8. Can low transmission fluid cause a P0747 code?
Yes, low or contaminated transmission fluid can cause the solenoid to malfunction and trigger the P0747 code.
9. How can I prevent the P0747 code from occurring on my GMC?
Regular transmission maintenance, such as fluid changes and inspections, can help prevent solenoid issues and avoid this code.
10. Is the P0747 code specific to GMC vehicles?
No, P0747 is a generic OBDII code that can appear on various makes and models, but the specific symptoms and solutions may vary by vehicle.
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