P103E 2018 GMC Sierra Code - Auxiliary Coolant Pump Control 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 Auxiliary Coolant Pump Control Module, Auxiliary Coolant Pump Control Module harness is open or shorted, Auxiliary Coolant Pump Control Module 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
- P103E 2018 GMC Sierra indicates Auxiliary Coolant Pump Control Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Auxiliary Coolant Pump Control Module, Auxiliary Coolant Pump Control Module harness is open or shorted, Auxiliary Coolant Pump Control Module 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 P103E 2018 GMC Sierra Description
What are the Possible Causes of the DTC P103E 2018 GMC Sierra?
- Faulty Auxiliary Coolant Pump Control Module
- Auxiliary Coolant Pump Control Module harness is open or shorted
- Auxiliary Coolant Pump Control Module circuit poor electrical connection
How to Fix the DTC P103E 2018 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 P103E 2018 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 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
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