P103E 2018 GMC Sierra Code - Auxiliary Coolant Pump Control Signal Message Counter Incorrect
Quick Answer
The P103E diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Auxiliary Coolant Pump Control Signal Message Counter is Incorrect. Common causes include Faulty auxiliary coolant pump, Defective control module, Wiring or connector issues. 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
- P103E 2018 GMC Sierra indicates Auxiliary Coolant Pump Control Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty auxiliary coolant pump, Defective control module, Wiring or connector issues.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P103E 2018 GMC Sierra Description
The P103E diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Auxiliary Coolant Pump Control Signal Message Counter is Incorrect. This code typically points to a communication issue between the vehicle's engine control module (ECM) and the auxiliary coolant pump control module. The auxiliary coolant pump is responsible for circulating coolant through the engine to help regulate its temperature, especially during idle or low-speed driving conditions. When the ECM detects that the signal message counter is incorrect, it means that there is a discrepancy in the communication between these modules, potentially leading to improper coolant circulation and engine overheating.
Common Causes of P103E 2018 GMC Sierra
- Faulty auxiliary coolant pump
- Defective control module
- Wiring or connector issues
- ECM communication error
- Software glitches or updates
Symptoms of P103E 2018 GMC Sierra
- Engine overheating
- Reduced fuel efficiency
- Illuminated check engine light
- Rough idling or stalling
- Poor heater performance
How to Fix P103E 2018 GMC Sierra
- Begin by conducting a visual inspection of the auxiliary coolant pump, control module, wiring, and connectors for any visible damage or corrosion.
- Use a scan tool to check for any stored fault codes and to monitor the communication between the ECM and the auxiliary coolant pump control module.
- Test the auxiliary coolant pump for proper functionality by applying power directly to it and checking for coolant circulation.
- Replace any faulty components such as the auxiliary coolant pump, control module, or damaged wiring and connectors.
- Clear the DTC and perform a test drive to ensure that the issue has been resolved and that the code does not reappear.
Cost to Fix P103E 2018 GMC Sierra
The cost of repairing a P103E code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, replacing the auxiliary coolant pump or control module can range from $200 to $500, while addressing wiring or connector issues may cost an additional $100 to $300. Overall, the total repair cost for this issue could range from $300 to $800, including parts and labor. It's important to note that labor rates can vary significantly based on location, with rates typically ranging from $80 to $150 per hour. It's advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on your specific circumstances.
Need more information about the P103E 2018 GMC Sierra code?
Need more information on how to fix the P103E 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P103E 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P103E 2018 GMC Sierra Code
What does the OBDII code P103E mean on a 2018 GMC Sierra?
The P103E code indicates an issue with the auxiliary coolant pump control signal, specifically that the message counter is incorrect.
What are the symptoms of the P103E code in a 2018 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced engine cooling efficiency, or issues with the auxiliary cooling system.
What causes the P103E code to appear?
Causes can include a faulty auxiliary coolant pump, wiring or connector issues, a malfunctioning control module, or software glitches in the vehicle's ECU.
Can I drive my 2018 GMC Sierra with a P103E code?
While you may still be able to drive, it's not recommended, as cooling system issues could lead to engine overheating and potential damage.
How do I diagnose the P103E code on a 2018 GMC Sierra?
Diagnosing involves using an OBDII scanner to confirm the code, inspecting the auxiliary coolant pump and its wiring, and testing the control module for proper operation.
What is the function of the auxiliary coolant pump in a 2018 GMC Sierra?
The auxiliary coolant pump helps circulate coolant through the engine and auxiliary systems to maintain proper operating temperatures.
How do I fix the P103E code on my 2018 GMC Sierra?
Repairs may include replacing the auxiliary coolant pump, repairing or replacing damaged wiring or connectors, or updating/reprogramming the ECU if a software issue is present.
What tools do I need to troubleshoot the P103E code?
You’ll need an OBDII scanner, a multimeter to test electrical connections, and possibly specialized tools for accessing and replacing the auxiliary coolant pump.
How much does it cost to repair a P103E code issue?
Repair costs can vary but typically range from $150 to $500, depending on whether the issue is with the pump, wiring, or control module.
Can a software update fix the P103E code?
Yes, if the issue is related to a software glitch in the ECU, a software update or reprogramming may resolve the problem.
Discuss the causes and fixes for P103E 2018 GMC Sierra OBDII Code
Code P103E 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.