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Engine-Codes – GMC – P103E 2016 GMC Sierra

P103E 2016 GMC Sierra Code - Auxiliary Coolant Pump Control Signal Message Counter Incorrect

Quick Answer

The P103E diagnostic trouble code (DTC) indicates that the auxiliary coolant pump control signal message counter is incorrect. Common causes include Faulty auxiliary coolant pump that is not functioning correctly, Damaged or corroded wiring and connectors related to the coolant pump, Software issues within the engine control module (ECM) that affect communication. 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 2016 GMC Sierra indicates Auxiliary Coolant Pump Control Signal Message Counter Incorrect.
Common causes
Common causes include Faulty auxiliary coolant pump that is not functioning correctly, Damaged or corroded wiring and connectors related to the coolant pump, Software issues within the engine control module (ECM) that affect communication.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 21, 2024
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Code P103E 2016 GMC Sierra Description

The P103E diagnostic trouble code (DTC) indicates that the auxiliary coolant pump control signal message counter is incorrect. This code is specific to the communication between the engine control module (ECM) and the auxiliary coolant pump, which plays a crucial role in managing the vehicle's cooling system, particularly in maintaining optimal engine temperatures and preventing overheating. The auxiliary coolant pump is typically used in vehicles with turbocharged engines or those equipped with additional cooling requirements, such as hybrid or electric vehicles.

OBDII Code P103E 2016 GMC Sierra - Auxiliary Coolant Pump Control Signal Message Counter Incorrect
P103E 2016 GMC Sierra Code - Auxiliary Coolant Pump Control Signal Message Counter Incorrect

Common Causes of P103E 2016 GMC Sierra

  1. Faulty auxiliary coolant pump that is not functioning correctly.
  2. Damaged or corroded wiring and connectors related to the coolant pump.
  3. Software issues within the engine control module (ECM) that affect communication.
  4. Low coolant levels or contamination affecting the pump's operation.
  5. Faulty sensors that provide feedback to the ECM regarding coolant temperature or pump operation.

Symptoms of P103E 2016 GMC Sierra

  1. Engine overheating, especially during heavy loads or in hot weather.
  2. Poor engine performance, including reduced power and acceleration.
  3. Warning lights on the dashboard, such as the check engine light.
  4. Unusual noises from the engine bay, potentially indicating pump failure.
  5. Fluctuating coolant temperatures, which may be observed on the temperature gauge.

How to Fix P103E 2016 GMC Sierra

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P103E code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the wiring and connectors associated with the auxiliary coolant pump for signs of damage, corrosion, or loose connections.
  3. Test the Auxiliary Coolant Pump: Use a multimeter to check the voltage and resistance of the auxiliary coolant pump to determine if it is functioning within specifications.
  4. Check Coolant Levels: Ensure that the coolant levels are adequate and that the coolant is clean and free of contaminants.
  5. ECM Update or Replacement: If the pump and wiring are in good condition, consider updating the ECM software or replacing the ECM if it is determined to be faulty.

Cost to Fix P103E 2016 GMC Sierra

The cost to repair the P103E code can vary widely based on the specific issue identified during diagnosis. Typical repair costs may range from $150 to $600, depending on whether the auxiliary coolant pump needs to be replaced, wiring repaired, or the ECM updated. Labor rates at auto repair shops typically range from $80 to $150 per hour, with metropolitan areas or dealerships often charging higher rates. Independent shops may offer lower rates. It's advisable to check local rates for a more precise estimate and to obtain a detailed quote after the diagnostic process is complete.

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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 P103E 2016 GMC Sierra Code

1. What does OBDII code P103E mean on a 2016 GMC Sierra?

P103E indicates an issue with the auxiliary coolant pump control signal, where the message counter is incorrect, suggesting a communication or electrical problem.

2. What are the common symptoms of code P103E in a 2016 GMC Sierra?

Symptoms may include a check engine light, reduced cooling system performance, engine overheating, or unusual noise from the auxiliary coolant pump.

3. What causes the P103E code in a GMC Sierra?

Common causes include a faulty auxiliary coolant pump, wiring or connector issues, a malfunctioning control module, or software-related communication errors.

4. Can I drive my 2016 GMC Sierra with a P103E code?

While the vehicle may still be drivable, ignoring this code could lead to engine overheating and potential damage, so it’s best to address the issue promptly.

5. How do I diagnose the P103E code on a 2016 GMC Sierra?

Diagnosis involves inspecting the auxiliary coolant pump and related wiring for damage, checking connectors for corrosion, and using a scan tool to monitor the control signal.

6. How do I fix the P103E code on my 2016 GMC Sierra?

Repairs may include replacing the auxiliary coolant pump, repairing damaged wiring or connectors, or reprogramming the control module if necessary.

7. Is the auxiliary coolant pump critical for engine performance?

Yes, the auxiliary coolant pump helps regulate engine temperature, especially during high-demand conditions, so it’s important for proper engine operation.

8. How much does it cost to fix the P103E code on a GMC Sierra?

Repair costs vary but may range from $150 to $500 or more depending on whether the issue involves the pump, wiring, or control module.

9. Can a software update resolve the P103E code on my 2016 GMC Sierra?

In some cases, a software update to the control module may resolve communication issues causing the P103E code.

10. How can I prevent the P103E code from returning?

Regular maintenance, inspecting the cooling system components, and addressing wiring issues promptly can help prevent the code from reoccurring.

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