AutoCodes – Generic – P1008

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

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Engine Coolant Bypass Valve, Engine Coolant Bypass Valve harness is open or shorted, Engine Coolant Bypass Valve 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: P1008 indicates Engine Coolant Bypass Valve Command Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Engine Coolant Bypass Valve, Engine Coolant Bypass Valve harness is open or shorted, Engine Coolant Bypass Valve 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 6,317

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 Aug 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1008 Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Engine Coolant Bypass Valve Command Signal Message Counter is Incorrect.

OBDII Code P1008 - Engine Coolant Bypass Valve Command Signal Message Counter Incorrect - AutoCodes.com — P1008 Code - Engine Coolant Bypass Valve Command Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1008?

Faulty Engine Coolant Bypass Valve
Engine Coolant Bypass Valve harness is open or shorted
Engine Coolant Bypass Valve circuit poor electrical connection

How to Fix the DTC P1008?

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 P1008 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 P1008 code?

Need more information on how to fix the P1008 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1008 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1008 Buick — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
P1008 Cadillac — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
P1008 Chevrolet — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
P1008 Dodge — Ignition Circuit High
P1008 GMC — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
P1008 Volvo — Throttle System Warning Signal low

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 Code

1. What are the common symptoms of OBDII code P1008?

- Common symptoms include engine overheating, poor heater performance, and potential engine stalling.

2. What can cause the OBDII code P1008 to trigger?

- The code P1008 can be triggered by issues with the engine coolant bypass valve, such as a faulty valve or wiring problems.

3. How can I diagnose the OBDII code P1008?

- Diagnosis typically involves checking the engine coolant bypass valve for proper operation, inspecting the wiring for any damage, and using a scan tool to retrieve the code.

4. What repairs are typically needed to fix OBDII code P1008?

- Repairs may involve replacing the engine coolant bypass valve, repairing any damaged wiring, or resetting the code after addressing the underlying issue.

5. Can I drive my vehicle with OBDII code P1008?

- It is not recommended to drive your vehicle with the code P1008 as it can lead to engine overheating and potential damage if left unresolved.

6. How serious is OBDII code P1008?

- OBDII code P1008 should be addressed promptly as it can cause engine overheating and other related issues if left unresolved.

7. Will resetting the OBDII code P1008 make it go away permanently?

- Resetting the code without addressing the underlying issue will likely result in the code reappearing once the problem is detected again.

8. Can a DIY enthusiast repair OBDII code P1008?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address OBDII code P1008 by replacing the engine coolant bypass valve or repairing wiring issues.

9. How much does it cost to fix OBDII code P1008 at a repair shop?

- The cost of fixing OBDII code P1008 at a repair shop can vary depending on the labor rates and parts needed, but it is typically a moderate repair cost.

10. Is it necessary to visit a mechanic for OBDII code P1008, or can I fix it myself?

- While some DIY enthusiasts may be able to address OBDII code P1008 themselves, it is recommended to consult a mechanic for accurate diagnosis and proper repair to ensure the issue is fully resolved.