P2738 2018 GMC Sierra Code - Transmission Control Solenoid Valve 6 Control Circuit Low Voltage
Quick Answer
The P2738 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 6 Control Circuit, specifically a low voltage condition. Common causes include Damaged wiring or connectors in the control circuit, Faulty transmission control module (TCM), Defective 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
- P2738 2018 GMC Sierra indicates Transmission Control Solenoid Valve 6 Control Circuit Low Voltage.
- Common causes
- Common causes include Damaged wiring or connectors in the control circuit, Faulty transmission control module (TCM), Defective 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 P2738 2018 GMC Sierra Description
The P2738 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 6 Control Circuit, specifically a low voltage condition. The transmission control solenoid valves play a crucial role in regulating the flow of transmission fluid within the transmission system, which is essential for proper gear shifting and overall transmission performance. When the control circuit for solenoid valve 6 detects low voltage, it means that the signal being sent to the solenoid is weaker than expected, potentially leading to erratic shifting patterns, harsh gear changes, or even transmission slippage.
Common Causes of P2738 2018 GMC Sierra
- Damaged wiring or connectors in the control circuit
- Faulty transmission control module (TCM)
- Defective solenoid valve
- Issues with the power supply to the solenoid
Symptoms of P2738 2018 GMC Sierra
- Hesitation or delay in gear shifts
- Rough or jerky shifting
- Transmission slipping
- Decreased fuel efficiency
- Transmission overheating
How to Fix P2738 2018 GMC Sierra
- Begin by conducting a thorough inspection of the wiring and connectors in the control circuit to identify any damage or corrosion. Repair or replace any damaged components.
- Test the transmission control module (TCM) to determine if it is functioning properly. Replace the TCM if necessary.
- Check the solenoid valve 6 for proper operation. Replace the solenoid valve if it is found to be defective.
- Verify the power supply to the solenoid valve and ensure that it is within the specified voltage range. Address any issues with the power supply as needed.
- Clear the DTC from the vehicle's computer system and test drive the vehicle to confirm that the issue has been resolved.
Cost to Fix P2738 2018 GMC Sierra
The typical repair costs for addressing a P2738 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for replacing a solenoid valve, repairing wiring or connectors, or replacing a transmission control module can range from $200 to $600. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair bill potentially amounting to $300 to $1000 or more. It's important to note that actual costs may vary based on factors such as location, vehicle make and model, and the specific repairs required. It's recommended to obtain a detailed estimate from a trusted auto repair shop to determine the precise cost of addressing the P2738 code on a 2018 GMC Sierra.
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Frequently Asked Questions about P2738 2018 GMC Sierra Code
What does the OBDII code P2738 mean on a 2018 GMC Sierra?
P2738 indicates a low voltage issue in the Transmission Control Solenoid Valve 6 Control Circuit, which affects the transmission's ability to shift properly.
What are the common symptoms of code P2738 on a 2018 GMC Sierra?
Symptoms may include harsh or delayed shifting, transmission slipping, decreased fuel efficiency, or the Check Engine Light illuminating.
What causes the P2738 code to appear on a 2018 GMC Sierra?
Common causes include a faulty solenoid, wiring or connector issues in the solenoid circuit, low transmission fluid, or a malfunctioning transmission control module (TCM).
Can low transmission fluid trigger the P2738 code?
Yes, low or contaminated transmission fluid can cause solenoid performance issues, leading to this code.
How do you diagnose the P2738 code on a 2018 GMC Sierra?
Diagnosis typically involves scanning for additional codes, inspecting wiring and connectors for damage, checking transmission fluid levels, and testing the solenoid's electrical resistance.
Can you drive with the P2738 code on a 2018 GMC Sierra?
Driving is not recommended, as this code can cause transmission shifting problems that may lead to further damage or unsafe driving conditions.
How do you fix the P2738 code on a 2018 GMC Sierra?
Repairs may include replacing the faulty solenoid, repairing damaged wiring or connectors, refilling or flushing the transmission fluid, or reprogramming the TCM.
What tools are required to troubleshoot the P2738 code?
A professional OBDII scanner, a multimeter for electrical testing, and basic tools for accessing the transmission components are commonly used.
How much does it cost to repair the P2738 code on a 2018 GMC Sierra?
Repair costs can vary widely, ranging from $100 for minor electrical repairs to over $500 if the solenoid or TCM needs replacement.
Does a faulty TCM always cause the P2738 code?
No, while a faulty TCM can cause this code, it’s more commonly related to solenoid or wiring issues. A thorough inspection is necessary to pinpoint the exact cause.
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