P0668 2017 GMC Sierra Code - Control Module Temperature Sensor Circuit Low Voltage
Quick Answer
The Transmission Control Module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. Common causes include Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted, Control Solenoid Valve Assembly circuit poor electrical connection. 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
- P0668 2017 GMC Sierra indicates Control Module Temperature Sensor Circuit Low Voltage.
- Common causes
- Common causes include Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted, Control Solenoid Valve Assembly circuit poor electrical connection.
- 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 P0668 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0668 2017 GMC Sierra?
- Faulty Control Solenoid Valve Assembly
- Control Solenoid Valve Assembly harness is open or shorted
- Control Solenoid Valve Assembly circuit poor electrical connection
How to Fix the DTC P0668 2017 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0668 2017 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 P0668 2017 GMC Sierra Code
1. What does OBDII code P0668 mean on a 2017 GMC Sierra?
Code P0668 indicates a low voltage issue in the control module temperature sensor circuit, which monitors the temperature of the control module to ensure proper operation.
2. What are the common symptoms of code P0668 in a 2017 GMC Sierra?
Symptoms may include engine hesitation, reduced fuel efficiency, poor overall performance, or illuminated check engine light.
3. What causes code P0668 on a 2017 GMC Sierra?
Common causes include damaged wiring or connectors, a faulty control module temperature sensor, or issues with the power or ground circuit for the sensor.
4. Can I drive my 2017 GMC Sierra with code P0668?
While it may still be drivable, ignoring this code can lead to further engine performance issues or damage to the control module.
5. How is code P0668 diagnosed on a 2017 GMC Sierra?
Technicians typically use a scan tool to inspect the sensor’s voltage readings, check wiring and connectors for damage, and test the control module temperature sensor itself.
6. What tools are needed to fix code P0668 on a 2017 GMC Sierra?
Common tools include an OBDII scanner, a multimeter for testing voltage, and basic hand tools for repairing or replacing damaged components.
7. How much does it cost to fix code P0668 on a 2017 GMC Sierra?
Repair costs can vary depending on the issue, but replacing the control module temperature sensor typically costs between $100 and $300, including parts and labor.
8. Can a dirty or damaged connector cause code P0668 on a 2017 GMC Sierra?
Yes, dirt, corrosion, or damage to the connectors can interrupt the circuit and result in low voltage readings.
9. How do you reset the P0668 code after repairs on a 2017 GMC Sierra?
After repairs, you can reset the code using an OBDII scanner, or the system may clear it automatically after several drive cycles if the issue is resolved.
10. Is the control module temperature sensor difficult to replace on a 2017 GMC Sierra?
Replacing the sensor is generally straightforward but may require locating the exact sensor and ensuring all connections are properly secured.
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