AutoCodes – GMC – P0669 GMC

P0669 GMC Code - Control Module Temperature Sensor Circuit High 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: P0669 GMC indicates Control Module Temperature Sensor Circuit High 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.

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Code Popularity 295

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0669 GMC Description

The Transmission Control Module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module temperature sensor provides the temperature of the Transmission Control Module substrate. This temperature reading is used in various diagnostic routines in the Transmission Control Module software. This fault is handled inside the Transmission Control Module and no external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the TCM internal temperature is 249°C (480°F) or greater for 1 min.

OBDII Code P0669 GMC - Control Module Temperature Sensor Circuit High Voltage - AutoCodes.com — P0669 GMC Code - Control Module Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0669 GMC?

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 P0669 GMC?

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 P0669 GMC 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.

Need more information about the P0669 GMC code?

Need more information on how to fix the P0669 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0669 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0669 2014 GMC Sierra — Control Module Temperature Sensor Circuit High Voltage
P0669 2015 GMC Sierra — Control Module Temperature Sensor Circuit High Voltage
P0669 2016 GMC Sierra — Control Module Temperature Sensor Circuit High Voltage
P0669 2017 GMC Sierra — Control Module Temperature Sensor Circuit High Voltage
P0669 2018 GMC Sierra — Control Module Temperature Sensor Circuit High Voltage

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0669 GMC Code

1. What does the OBDII code P0669 mean on a GMC vehicle?

P0669 indicates that the control module has detected a high voltage issue in the control module temperature sensor circuit.

2. What are the common symptoms of the P0669 code on a GMC?

Symptoms may include an illuminated Check Engine Light, poor engine performance, erratic electrical behavior, or difficulty starting the vehicle.

3. What causes the P0669 code to appear on a GMC?

Common causes include a faulty control module temperature sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning control module.

4. How is the P0669 code diagnosed in a GMC?

A technician will use a scan tool to confirm the code, inspect the sensor and wiring for damage, test the sensor's voltage, and check for poor connections or a faulty module.

5. Can I drive my GMC with the P0669 code?

While it may be possible to drive, it is not recommended as the issue could lead to further engine or electrical damage if not addressed.

6. How do you repair the P0669 code on a GMC?

Repairs may include replacing the control module temperature sensor, repairing or replacing damaged wiring, cleaning electrical connections, or replacing the control module.

7. How much does it cost to fix the P0669 code on a GMC?

Repair costs vary depending on the issue, but sensor replacement typically ranges from $100 to $300, while control module replacement can cost $500 or more.

8. Can a bad battery cause the P0669 code on a GMC?

A weak or failing battery can contribute to electrical issues, but it is not a common direct cause of this specific code.

9. What tools are needed to troubleshoot the P0669 code on a GMC?

Tools may include a scan tool, multimeter, wiring diagram, and basic hand tools for inspecting and testing components.

10. How can I prevent the P0669 code from recurring on my GMC?

Regular maintenance, including inspecting wiring and connections, ensuring proper sensor function, and addressing electrical issues promptly, can help prevent this code.