P1008 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P1008 GMC?
- 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 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 P1008 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.
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Information for Specific GMC Models
- P1008 2014 GMC Sierra — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
- P1008 2015 GMC Sierra — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
- P1008 2016 GMC Sierra — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
- P1008 2017 GMC Sierra — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
- P1008 2018 GMC Sierra — Engine Coolant Bypass Valve Command Signal Message Counter Incorrect
Frequently Asked Questions about P1008 GMC Code
1. What are the common symptoms of OBDII code P1008 in a GMC vehicle?
- Common symptoms include engine overheating, fluctuating engine temperature, poor heater performance, and potential coolant leaks.
2. What can cause the OBDII code P1008 in a GMC vehicle to trigger?
- The code can be triggered by a faulty engine coolant bypass valve, a malfunctioning coolant temperature sensor, wiring issues, or a problem with the engine control module (ECM).
3. How serious is the OBDII code P1008 in a GMC vehicle?
- The code should be addressed promptly as it can lead to engine overheating, potential damage to the engine, and poor overall vehicle performance.
4. How can I diagnose the OBDII code P1008 in my GMC vehicle?
- Diagnosis typically involves checking the engine coolant bypass valve, inspecting the coolant temperature sensor, testing the wiring for any faults, and scanning the ECM for error codes.
5. Can I continue driving my GMC vehicle with the OBDII code P1008 present?
- It is not recommended to continue driving the vehicle with this code present, as it can lead to engine overheating and potential damage if left unresolved.
6. What are some repair tips for fixing the OBDII code P1008 in a GMC vehicle?
- Repair tips may include replacing the engine coolant bypass valve, checking and replacing the coolant temperature sensor if necessary, repairing any damaged wiring, and resetting the ECM.
7. How much does it typically cost to repair the OBDII code P1008 in a GMC vehicle?
- The cost of repair can vary depending on the exact cause of the code, but it may range from $150 to $500 or more, including parts and labor.
8. Can I reset the OBDII code P1008 in my GMC vehicle by disconnecting the battery?
- While disconnecting the battery may temporarily clear the code, it is recommended to properly diagnose and repair the underlying issue to prevent it from reoccurring.
9. Are there any preventive maintenance steps to avoid the OBDII code P1008 in a GMC vehicle?
- Regularly inspecting the cooling system, addressing any coolant leaks promptly, and ensuring proper coolant levels can help prevent issues that may trigger this code.
10. Is it possible to drive a GMC vehicle with a bypass valve issue that triggered the OBDII code P1008?
- It is not advisable to drive the vehicle with a faulty bypass valve, as it can lead to improper coolant flow, engine overheating, and potential engine damage.
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