P0668 GMC Code - Control Module Temperature Sensor Circuit Low Voltage
Quick Answer
The P0668 GMC code indicates a problem with the Control Module Temperature Sensor Circuit, specifically detecting low voltage. Common causes include Wiring or connector issues, Faulty temperature sensor, Malfunctioning ECM. 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 GMC indicates Control Module Temperature Sensor Circuit Low Voltage.
- Common causes
- Common causes include Wiring or connector issues, Faulty temperature sensor, Malfunctioning ECM.
- 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 GMC Description
The P0668 GMC code indicates a problem with the Control Module Temperature Sensor Circuit, specifically detecting low voltage. The control module temperature sensor is responsible for monitoring the temperature of the engine control module (ECM). The ECM needs to maintain a certain temperature range for optimal performance, and if the sensor detects low voltage, it can lead to issues with the ECM's functionality.
Common Causes of P0668 GMC
- Wiring or connector issues
- Faulty temperature sensor
- Malfunctioning ECM
- Problem with the control module temperature sensor circuit
Symptoms of P0668 GMC
- Poor fuel efficiency
- Rough idling or misfires
- Difficulty starting the engine
- Stalling or hesitation during acceleration
- Illumination of the check engine light
How to Fix P0668 GMC
- Perform a thorough inspection of the wiring and connectors to check for any damage or corrosion. Repair or replace as needed.
- Test the temperature sensor to ensure it is functioning correctly. Replace if faulty.
- Check the ECM for any signs of malfunction. Repair or replace as necessary.
- Diagnose and repair any issues with the control module temperature sensor circuit.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0668 GMC
The typical repair costs for addressing a P0668 GMC code can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary significantly, so it's advisable to obtain a detailed estimate from a trusted mechanic before proceeding with the repairs.
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Information for Specific GMC Models
- P0668 2014 GMC Sierra — Control Module Temperature Sensor Circuit Low Voltage
- P0668 2015 GMC Sierra — Control Module Temperature Sensor Circuit Low Voltage
- P0668 2016 GMC Sierra — Control Module Temperature Sensor Circuit Low Voltage
- P0668 2017 GMC Sierra — Control Module Temperature Sensor Circuit Low Voltage
- P0668 2018 GMC Sierra — Control Module Temperature Sensor Circuit Low Voltage
Frequently Asked Questions about P0668 GMC Code
1. What does the OBDII code P0668 mean on a GMC vehicle?
P0668 indicates a low voltage issue in the Control Module Temperature Sensor Circuit, which monitors the engine control module (ECM) temperature to ensure proper operation.
2. What are the common symptoms of code P0668 in GMC vehicles?
Symptoms may include engine performance issues, poor fuel efficiency, illuminated check engine light, or potential overheating of the control module.
3. What causes the P0668 code to appear in GMC vehicles?
Common causes include a faulty control module temperature sensor, damaged wiring or connectors in the sensor circuit, or an issue with the ECM itself.
4. Can I drive my GMC with a P0668 code?
Driving with this code is not recommended, as it may lead to engine performance issues or damage to the ECM if the problem is not addressed.
5. How do I diagnose the P0668 code on my GMC vehicle?
Start by inspecting the wiring and connectors for the control module temperature sensor, checking for damage or corrosion. Use a multimeter to test the sensor and circuit for proper voltage and resistance.
6. What repairs can fix the P0668 code in a GMC?
Repairs may involve replacing the control module temperature sensor, repairing or replacing damaged wiring or connectors, or in rare cases, replacing the ECM.
7. How much does it cost to fix the P0668 code on a GMC?
The repair cost depends on the issue. Replacing a temperature sensor may cost $50-$150, while ECM replacement can range from $500-$1,500, including labor.
8. Can a dirty or corroded connector cause the P0668 code?
Yes, dirty or corroded connectors can disrupt the sensor circuit, leading to a low voltage issue and triggering the P0668 code.
9. Is the ECM temperature sensor the same as the engine coolant temperature sensor?
No, the ECM temperature sensor specifically monitors the temperature of the engine control module, while the coolant temperature sensor monitors the engine's coolant.
10. Will clearing the code with a scanner fix the P0668 issue?
Clearing the code may turn off the check engine light temporarily, but the underlying problem must be resolved to prevent the code from returning.
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