P1008 2014 GMC Sierra 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 2014 GMC Sierra 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.
Code P1008 2014 GMC Sierra Description
What are the Possible Causes of the DTC P1008 2014 GMC Sierra?
- 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 2014 GMC Sierra?
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 2014 GMC Sierra 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 P1008 2014 GMC Sierra Code
1. What does the OBDII code P1008 mean on a 2014 GMC Sierra?
P1008 indicates an issue with the engine coolant bypass valve command signal, where the message counter is detected as incorrect by the engine control module (ECM).
2. What are the common symptoms of the P1008 code on a 2014 GMC Sierra?
Symptoms may include an illuminated check engine light, erratic engine temperature readings, reduced engine performance, or potential overheating.
3. What causes the P1008 code on a GMC Sierra?
Possible causes include a faulty coolant bypass valve, damaged wiring or connectors in the valve circuit, a malfunctioning ECM, or software-related issues.
4. Can I drive my 2014 GMC Sierra with a P1008 code?
Driving with this code is not recommended, as improper coolant flow can lead to overheating and potential engine damage if not addressed promptly.
5. How do I diagnose the P1008 code on my GMC Sierra?
Diagnosis involves inspecting the coolant bypass valve, checking wiring and connectors for damage or corrosion, and using a scan tool to monitor the valve's operation.
6. How do I fix the P1008 code on a 2014 GMC Sierra?
Repairs may include replacing the coolant bypass valve, repairing damaged wiring, cleaning corroded connectors, or reprogramming/updating the ECM if necessary.
7. Is the coolant bypass valve expensive to replace on a 2014 GMC Sierra?
The cost varies depending on labor rates and part pricing, but the valve itself is generally affordable. Expect higher costs if additional wiring or ECM repairs are needed.
8. Can a faulty thermostat cause the P1008 code to appear?
A faulty thermostat is unlikely to directly cause P1008, but it could contribute to cooling system issues that exacerbate the problem.
9. Does the P1008 code require ECM replacement on a 2014 GMC Sierra?
In most cases, ECM replacement is not necessary. The issue is more commonly related to the coolant bypass valve or its associated wiring.
10. Will clearing the P1008 code with a scan tool fix the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying problem must be addressed to prevent the code from returning.
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