P0668 Buick 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 Buick 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 Buick Description
What are the Possible Causes of the DTC P0668 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code P0668 mean on a Buick?
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 Buick?
Symptoms may include poor engine performance, difficulty starting, erratic idling, reduced fuel efficiency, or the Check Engine Light being illuminated.
3. What causes the P0668 code to appear on a Buick?
Common causes include a faulty control module temperature sensor, damaged wiring or connectors, a short circuit, or a malfunctioning powertrain control module (PCM).
4. Is it safe to drive a Buick with code P0668?
Driving with this code may increase the risk of engine damage if the control module overheats, so it’s best to address the issue as soon as possible.
5. How can I diagnose the P0668 code on my Buick?
Start by inspecting the sensor wiring and connectors for damage, testing the temperature sensor for proper operation, and using a multimeter to check for voltage issues in the circuit.
6. How do I fix the P0668 code on a Buick?
Repairs may involve replacing the control module temperature sensor, repairing or replacing damaged wiring, or reprogramming/replacing the PCM if necessary.
7. Can a bad control module temperature sensor cause other problems in my Buick?
Yes, a faulty sensor can lead to improper control module operation, affecting engine performance and potentially causing additional fault codes.
8. What tools are needed to fix code P0668 on a Buick?
Tools may include an OBDII scanner, a multimeter, basic hand tools, and possibly a wiring diagram for your vehicle.
9. How much does it cost to fix the P0668 code on a Buick?
The repair cost can vary, with sensor replacement typically ranging from $50 to $200, while PCM replacement or reprogramming could cost $500 or more.
10. Can I clear the P0668 code on my Buick without fixing it?
Clearing the code with an OBDII scanner will turn off the Check Engine Light temporarily, but the issue will likely recur unless the underlying problem is resolved.
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