P0668 2017 GMC Sierra Code - Control Module Temperature Sensor Circuit Low Voltage
Quick Answer
The P0668 diagnostic trouble code (DTC) on a 2017 GMC Sierra indicates a problem with the control module temperature sensor circuit registering low voltage. Common causes include Faulty control module temperature sensor, Wiring or connector issues in the control module temperature sensor circuit, ECM/PCM malfunction. 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 module temperature sensor, Wiring or connector issues in the control module temperature sensor circuit, ECM/PCM malfunction.
- 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 2017 GMC Sierra Description
The P0668 diagnostic trouble code (DTC) on a 2017 GMC Sierra indicates a problem with the control module temperature sensor circuit registering low voltage. The control module temperature sensor is responsible for monitoring the temperature of the engine control module (ECM) or powertrain control module (PCM). A low voltage reading from this sensor can lead to issues with engine performance, fuel efficiency, and emissions control.
Common Causes of P0668 2017 GMC Sierra
- Faulty control module temperature sensor
- Wiring or connector issues in the control module temperature sensor circuit
- ECM/PCM malfunction
- Corrosion or damage to sensor wiring
- Electrical issues such as a blown fuse or short circuit
Symptoms of P0668 2017 GMC Sierra
- Reduced engine power
- Rough idling
- Poor acceleration
- Stalling
- Decreased fuel efficiency
How to Fix P0668 2017 GMC Sierra
- Diagnose the root cause of the low voltage reading using a diagnostic scanner.
- Inspect the control module temperature sensor, wiring, and connectors for any damage or corrosion.
- Test the sensor's resistance and voltage output to determine if it is functioning properly.
- Replace the control module temperature sensor if it is faulty.
- Clear the DTC and reset the ECM/PCM to see if the issue has been resolved.
Cost to Fix P0668 2017 GMC Sierra
The cost of repairing a P0668 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for replacing a control module temperature sensor can range from $50 to $150. Labor costs at most auto repair shops typically range from $80 to $150 per hour. Therefore, you can expect the total repair cost to be between $150 and $300, excluding any additional diagnostic fees or taxes. It is recommended to obtain quotes from local auto repair shops for a more accurate estimate.
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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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