P0973 GMC Code - Shift Solenoid Valve 1 Control Circuit Low Voltage
Quick Answer
The P0973 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically a low voltage issue. Common causes include Faulty shift solenoid valve: The shift solenoid valve itself may be defective or damaged, causing it to operate erratically and trigger the low voltage condition, Wiring issues: Corrosion, damage, or loose connections in the wiring harness that connects the shift solenoid valve to the ECM/TCM can disrupt the electrical signal, ECM/TCM malfunction: A malfunction in the engine control module or transmission control module can prevent the proper signal from reaching the shift 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
- P0973 GMC indicates Shift Solenoid Valve 1 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty shift solenoid valve: The shift solenoid valve itself may be defective or damaged, causing it to operate erratically and trigger the low voltage condition, Wiring issues: Corrosion, damage, or loose connections in the wiring harness that connects the shift solenoid valve to the ECM/TCM can disrupt the electrical signal, ECM/TCM malfunction: A malfunction in the engine control module or transmission control module can prevent the proper signal from reaching the shift 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 P0973 GMC Description
The P0973 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically a low voltage issue. The shift solenoid valve is a critical component of the transmission system responsible for controlling the flow of transmission fluid to engage or disengage specific gears. In this case, a low voltage reading suggests that the control circuit is not receiving the proper electrical signal required to function correctly. This can lead to erratic shifting patterns, transmission slippage, and potential damage to the transmission system if left unresolved.
Common Causes of P0973 GMC
- Faulty shift solenoid valve: The shift solenoid valve itself may be defective or damaged, causing it to operate erratically and trigger the low voltage condition.
- Wiring issues: Corrosion, damage, or loose connections in the wiring harness that connects the shift solenoid valve to the ECM/TCM can disrupt the electrical signal.
- ECM/TCM malfunction: A malfunction in the engine control module or transmission control module can prevent the proper signal from reaching the shift solenoid valve.
- Low transmission fluid levels: Insufficient transmission fluid levels can affect the hydraulic pressure needed to engage the shift solenoid valve correctly.
- Mechanical issues: Internal transmission problems, such as a clogged filter or worn components, can impact the overall performance of the shift solenoid valve.
Symptoms of P0973 GMC
- Erratic shifting: The vehicle may experience abrupt or delayed shifts between gears, leading to a jerky or rough driving experience.
- Transmission slippage: The transmission may slip out of gear or fail to engage properly, causing a loss of power and acceleration.
- Harsh shifting: The vehicle may exhibit harsh or clunky shifts when accelerating or decelerating, indicating issues with gear engagement.
- Poor fuel efficiency: A malfunctioning shift solenoid valve can lead to increased fuel consumption due to inefficient transmission operation.
- Illuminated check engine light: The P0973 DTC triggers the check engine light to alert the driver of a potential issue with the transmission system.
How to Fix P0973 GMC
- Diagnose the issue: Use a professional diagnostic scanner to retrieve the specific DTC, check the wiring harness for any visible damage, and perform a thorough inspection of the shift solenoid valve.
- Replace the shift solenoid valve: If the valve is determined to be faulty, it will need to be replaced with a new one to restore proper transmission operation.
- Repair wiring connections: Repair or replace any damaged wiring connections to ensure a secure and reliable electrical connection between the shift solenoid valve and the ECM/TCM.
- Check and refill transmission fluid: Inspect the transmission fluid level and quality, and top it off or replace it if necessary to maintain proper hydraulic pressure.
- Clear codes and test drive: Clear the DTC from the ECM/TCM memory, test drive the vehicle to ensure proper shifting operation, and verify that the issue has been resolved.
Cost to Fix P0973 GMC
The cost of repairing a P0973 DTC for a GMC vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a shift solenoid valve can range from $150 to $300, including parts and labor. Additional costs may apply if there are wiring repairs or other components that need to be addressed. Diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.
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Information for Specific GMC Models
- P0973 2014 GMC Sierra — Shift Solenoid Valve 1 Control Circuit Low Voltage
- P0973 2015 GMC Sierra — Shift Solenoid Valve 1 Control Circuit Low Voltage
- P0973 2016 GMC Sierra — Shift Solenoid Valve 1 Control Circuit Low Voltage
- P0973 2017 GMC Sierra — Shift Solenoid Valve 1 Control Circuit Low Voltage
- P0973 2018 GMC Sierra — Shift Solenoid Valve 1 Control Circuit Low Voltage
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