P0668 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P0668 2015 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 2015 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 2015 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 2015 GMC Sierra Code
1. What does the OBDII code P0668 mean on a 2015 GMC Sierra?
P0668 indicates a low voltage issue in the control module temperature sensor circuit, which monitors the temperature of the powertrain control module (PCM).
2. What are the common symptoms of code P0668 in a 2015 GMC Sierra?
Symptoms may include the check engine light illuminating, erratic engine performance, difficulty starting the vehicle, or reduced fuel efficiency.
3. What causes the P0668 code to appear in a 2015 GMC Sierra?
The code is typically caused by a faulty control module temperature sensor, damaged wiring or connectors, or an issue with the PCM.
4. Can I drive my 2015 GMC Sierra with the P0668 code active?
Driving with this code is not recommended, as it may lead to inconsistent engine performance or potential damage to the PCM if the issue is not resolved.
5. How do I diagnose the P0668 code on a 2015 GMC Sierra?
Diagnose by using an OBDII scanner to confirm the code, inspecting the sensor and wiring for damage, and testing the voltage and resistance of the temperature sensor circuit.
6. What tools are needed to fix the P0668 code on a 2015 GMC Sierra?
You may need an OBDII scanner, multimeter, and basic hand tools to inspect and repair the sensor or wiring.
7. How much does it cost to fix the P0668 code on a 2015 GMC Sierra?
Repair costs can vary, but replacing a faulty temperature sensor typically ranges from $100 to $300, depending on parts and labor.
8. Can a faulty PCM cause the P0668 code in a 2015 GMC Sierra?
Yes, a malfunctioning PCM can trigger this code, though it is less common and should be checked after ruling out sensor or wiring issues.
9. How do I reset the P0668 code after making repairs on my 2015 GMC Sierra?
The code can be reset using an OBDII scanner, or it may clear automatically after several drive cycles if the issue is resolved.
10. What happens if I ignore the P0668 code on my 2015 GMC Sierra?
Ignoring the code can lead to worsening engine performance, potential PCM overheating, or more expensive repairs in the future.
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