P0668 2015 GMC Sierra Code - Control Module Temperature Sensor Circuit Low Voltage
Quick Answer
The P0668 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a low voltage condition detected in the control module temperature sensor circuit. Common causes include Faulty Control Module Temperature Sensor: The sensor itself may be defective and not providing accurate readings, Damaged Wiring or Connectors: Corrosion, breaks, or loose connections in the sensor circuit can cause a low voltage condition, Malfunctioning Control Module: Issues with the control module itself can lead to voltage irregularities in the sensor circuit. 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 Module Temperature Sensor: The sensor itself may be defective and not providing accurate readings, Damaged Wiring or Connectors: Corrosion, breaks, or loose connections in the sensor circuit can cause a low voltage condition, Malfunctioning Control Module: Issues with the control module itself can lead to voltage irregularities in the sensor circuit.
- 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 P0668 2015 GMC Sierra Description
The P0668 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a low voltage condition detected in the control module temperature sensor circuit. This sensor is responsible for monitoring the temperature of the control module, which is crucial for ensuring optimal performance and preventing overheating. When the voltage in the circuit is below the specified range, it can lead to various issues that affect the vehicle's performance and overall functionality.
Common Causes of P0668 2015 GMC Sierra
- Faulty Control Module Temperature Sensor: The sensor itself may be defective and not providing accurate readings.
- Damaged Wiring or Connectors: Corrosion, breaks, or loose connections in the sensor circuit can cause a low voltage condition.
- Malfunctioning Control Module: Issues with the control module itself can lead to voltage irregularities in the sensor circuit.
- Electrical System Problems: Faulty grounds, shorts, or other electrical issues can impact the sensor circuit's voltage levels.
Symptoms of P0668 2015 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Engine Performance: The vehicle may experience a decrease in engine performance, such as reduced power or acceleration.
- Poor Fuel Efficiency: A low voltage condition in the control module temperature sensor circuit can lead to poor fuel efficiency.
- Rough Idling: The engine may idle roughly or inconsistently due to the malfunctioning sensor.
- Overheating: In severe cases, the vehicle may experience overheating issues due to the control module temperature sensor not functioning correctly.
How to Fix P0668 2015 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the control module temperature sensor circuit.
- Test the Sensor: Check the sensor's resistance and voltage output to determine if it is functioning correctly.
- Inspect Wiring and Connectors: Check for any damage or loose connections in the sensor circuit and repair or replace as needed.
- Replace the Control Module Temperature Sensor: If the sensor is faulty, replace it with a new, OEM-quality sensor.
- Clear the Code: After completing the repair, clear the trouble code from the vehicle's computer memory to reset the system.
Cost to Fix P0668 2015 GMC Sierra
The typical repair costs for addressing a P0668 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the parts and labor required for the repair. On average, the cost of replacing a control module temperature sensor ranges from $100 to $200, including parts and labor. However, additional costs may apply if there are wiring or connector issues that need to be addressed. It's important to consider that diagnosis 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 location and vehicle specifics.
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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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