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P1008 2017 GMC Sierra Code - Engine Coolant Bypass Valve Command Signal Message Counter Incorrect

Quick Answer

The P1008 diagnostic trouble code for a 2017 GMC Sierra indicates that there is an issue with the Engine Coolant Bypass Valve Command Signal Message Counter being incorrect. Common causes include Faulty engine coolant bypass valve, Wiring issues or electrical connection problems, Malfunctioning engine coolant temperature sensor. 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
P1008 2017 GMC Sierra indicates Engine Coolant Bypass Valve Command Signal Message Counter Incorrect.
Common causes
Common causes include Faulty engine coolant bypass valve, Wiring issues or electrical connection problems, Malfunctioning engine coolant temperature sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code P1008 2017 GMC Sierra Description

The P1008 diagnostic trouble code for a 2017 GMC Sierra indicates that there is an issue with the Engine Coolant Bypass Valve Command Signal Message Counter being incorrect. This code is specifically related to the engine coolant bypass valve, which is responsible for regulating the flow of coolant through the engine. The engine coolant bypass valve helps to control the temperature of the engine by allowing coolant to bypass the radiator when the engine is cold, ensuring that it warms up quickly.

OBDII Code P1008 2017 GMC Sierra - Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
P1008 2017 GMC Sierra Code - Engine Coolant Bypass Valve Command Signal Message Counter Incorrect

Common Causes of P1008 2017 GMC Sierra

  1. Faulty engine coolant bypass valve
  2. Wiring issues or electrical connection problems
  3. Malfunctioning engine coolant temperature sensor
  4. ECM (Engine Control Module) software issue
  5. Coolant system blockage or air pockets

Symptoms of P1008 2017 GMC Sierra

  1. Engine overheating
  2. Poor fuel efficiency
  3. Fluctuating engine temperature gauge
  4. Check Engine Light illuminated
  5. Reduced heater performance

How to Fix P1008 2017 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the P1008 code and identify the specific cause.
  2. Inspect the engine coolant bypass valve for any signs of damage or malfunction. Replace if necessary.
  3. Check the wiring and electrical connections related to the bypass valve for any corrosion or disconnection. Repair as needed.
  4. Test the engine coolant temperature sensor to ensure it is functioning properly. Replace if faulty.
  5. Clear the trouble code from the ECM and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1008 2017 GMC Sierra

The typical repair costs for addressing a P1008 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty engine coolant bypass valve can cost between $150 to $300, including parts and labor. However, additional costs may be incurred if other components need to be replaced or if extensive diagnostic work is required. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops typically range between $80 to $150 per hour, but can vary based on location and other factors.

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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 P1008 2017 GMC Sierra Code

1. What does the OBDII code P1008 mean on a 2017 GMC Sierra?

P1008 indicates an issue with the engine coolant bypass valve command signal, where the message counter is deemed incorrect by the vehicle's computer.

2. What are the symptoms of code P1008 in a 2017 GMC Sierra?

Common symptoms include engine overheating, irregular coolant flow, reduced heating or cooling performance, and possibly an illuminated check engine light.

3. What causes the P1008 code on a GMC Sierra?

The code can result from a faulty engine coolant bypass valve, damaged wiring or connectors, a malfunctioning powertrain control module (PCM), or software issues.

4. Can I drive my 2017 GMC Sierra with a P1008 code?

Driving with this code may be possible but is not recommended, as it could lead to overheating and potential engine damage if coolant flow is not properly regulated.

5. How do you diagnose the P1008 code on a GMC Sierra?

Diagnosis typically involves inspecting the coolant bypass valve, checking for damaged wiring or connectors, confirming proper signal communication, and testing the PCM functionality.

6. How can the P1008 code be fixed on a 2017 GMC Sierra?

Repairs may include replacing the coolant bypass valve, repairing damaged wiring or connectors, updating PCM software, or replacing the PCM if necessary.

7. What tools are needed to fix the P1008 code?

You may need an OBDII scanner, a multimeter to test electrical components, and potentially specialty tools to access and replace the coolant bypass valve.

8. How much does it cost to repair a P1008 code on a GMC Sierra?

The cost varies, but replacing the coolant bypass valve typically ranges from $150 to $300, including parts and labor. Additional wiring or PCM repairs may increase costs.

9. Could a low coolant level cause the P1008 code?

While low coolant levels can cause overheating issues, they are unlikely to trigger the P1008 code specifically. However, it’s still important to maintain correct coolant levels.

10. Does a P1008 code always require a part replacement?

Not always. Sometimes, the issue can be resolved by repairing damaged wiring, cleaning electrical connections, or reprogramming the PCM.

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