P0668 Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC P0668 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does the OBDII code P0668 mean on a Cadillac?
P0668 indicates that the control module has detected low voltage in the temperature sensor circuit, which monitors the module's operating temperature.
2. What are the symptoms of the P0668 code on a Cadillac?
Common symptoms include the Check Engine Light turning on, potential engine performance issues, or the vehicle entering limp mode.
3. What causes the P0668 code to appear on a Cadillac?
Possible causes include a faulty control module temperature sensor, damaged wiring or connectors, or a malfunctioning powertrain control module (PCM).
4. Can I drive my Cadillac with the P0668 code?
While the car may still be drivable, it is not recommended as the issue could lead to further damage to the control module or other components.
5. How do I diagnose the P0668 code on my Cadillac?
Start by inspecting the wiring and connectors for damage, checking the control module temperature sensor for faults, and using a scan tool to monitor sensor readings.
6. What tools are needed to fix the P0668 code on a Cadillac?
You may need a digital multimeter, an OBDII scan tool, and possibly replacement parts such as the temperature sensor or wiring.
7. How much does it cost to fix the P0668 code on a Cadillac?
Repair costs can vary but typically range from $100 to $300, depending on whether you need to replace the sensor, repair wiring, or replace the control module.
8. Can a bad PCM cause the P0668 code on a Cadillac?
Yes, a malfunctioning PCM can cause this code, but it is less common compared to wiring or sensor issues.
9. How do I reset the P0668 code on a Cadillac?
After fixing the issue, use an OBDII scan tool to clear the code. If the problem persists, the code may return.
10. Is the P0668 code specific to Cadillacs?
No, the P0668 code can appear on other vehicles, but the exact symptoms and fixes may vary depending on the make and model.
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