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P103E 2017 GMC Sierra Code - Auxiliary Coolant Pump Control Signal Message Counter Incorrect

Quick Answer

The P103E code indicates that the auxiliary coolant pump control signal message counter is incorrect in a 2017 GMC Sierra. Common causes include Faulty auxiliary coolant pump that fails to operate or respond to control signals, Damaged or corroded wiring and connectors related to the auxiliary coolant pump, Malfunctioning engine control module (ECM) that misinterprets data from the pump. 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 2017 GMC Sierra indicates Auxiliary Coolant Pump Control Signal Message Counter Incorrect.
Common causes
Common causes include Faulty auxiliary coolant pump that fails to operate or respond to control signals, Damaged or corroded wiring and connectors related to the auxiliary coolant pump, Malfunctioning engine control module (ECM) that misinterprets data from the pump.
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 2017 GMC Sierra Description

The P103E code indicates that the auxiliary coolant pump control signal message counter is incorrect in a 2017 GMC Sierra. This code is part of the vehicle's onboard diagnostics (OBD-II) system, which monitors various components to ensure optimal performance and emissions control. The auxiliary coolant pump is responsible for circulating coolant through the engine and the heating system, particularly when the engine is cold or under heavy load. An incorrect signal message counter suggests that the engine control module (ECM) is not receiving the expected data from the auxiliary coolant pump, which can lead to improper coolant circulation.

OBDII Code P103E 2017 GMC Sierra - Auxiliary Coolant Pump Control Signal Message Counter Incorrect
P103E 2017 GMC Sierra Code - Auxiliary Coolant Pump Control Signal Message Counter Incorrect

Common Causes of P103E 2017 GMC Sierra

  1. Faulty auxiliary coolant pump that fails to operate or respond to control signals.
  2. Damaged or corroded wiring and connectors related to the auxiliary coolant pump.
  3. Malfunctioning engine control module (ECM) that misinterprets data from the pump.
  4. Software issues within the ECM that require updates or reprogramming.
  5. Blockages in the coolant system that prevent proper circulation, leading to erroneous readings.

Symptoms of P103E 2017 GMC Sierra

  1. Engine overheating, especially during heavy load or high ambient temperatures.
  2. Poor cabin heating performance, leading to discomfort during colder weather.
  3. Warning lights illuminated on the dashboard, particularly the check engine light.
  4. Decreased engine performance, including reduced power and acceleration.
  5. Unusual noises from the engine compartment, indicating potential pump or wiring issues.

How to Fix P103E 2017 GMC Sierra

  1. Diagnostic Scan: Start by using an OBD-II scanner to confirm the P103E code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a thorough visual inspection of 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 test the auxiliary coolant pump for proper voltage and functionality. If the pump is found to be defective, it will need to be replaced.
  4. Check the ECM: If the pump is functioning correctly, the next step is to check the ECM for software updates or potential internal failures. Reprogramming or replacing the ECM may be necessary.
  5. Coolant System Flush: If blockages are suspected, perform a coolant system flush to remove any debris or contaminants that could be affecting the pump's operation.

Cost to Fix P103E 2017 GMC Sierra

The typical repair costs for addressing a P103E code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $200 and $800. This estimate includes parts such as the auxiliary coolant pump (which can range from $100 to $300) and labor costs, which can vary from $80 to $150 per hour. The total labor time for diagnosis and repair may take anywhere from 2 to 4 hours, depending on the complexity of the issue. It's important to note that labor rates can differ significantly based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. Always check local rates for a more precise estimate.

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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 2017 GMC Sierra Code

1. What does the OBDII code P103E mean on a 2017 GMC Sierra?

Code P103E indicates an issue related to the Auxiliary Coolant Pump Control Signal Message Counter being incorrect, which may point to a communication or signal error between the auxiliary coolant pump and the vehicle’s control module.

2. What are the common symptoms of code P103E in a 2017 GMC Sierra?

Symptoms may include an illuminated check engine light, reduced cooling performance, overheating during heavy loads or idling, and possible issues with cabin temperature control.

3. What causes the P103E code to appear on a GMC Sierra?

Common causes include a malfunctioning auxiliary coolant pump, faulty wiring or connectors in the pump circuit, a defective powertrain control module (PCM), or software-related communication errors.

4. Can I drive my 2017 GMC Sierra with a P103E code?

It’s not recommended to drive for extended periods with this code, as it may lead to engine overheating or reduced cooling system efficiency, potentially causing further damage.

5. How is the P103E code diagnosed?

A technician will typically use a scan tool to verify the code, inspect the wiring and connectors for damage, test the auxiliary coolant pump for proper operation, and check for any software updates for the PCM.

6. What repairs can fix the P103E code on a GMC Sierra?

Repairs may include replacing the auxiliary coolant pump, repairing or replacing damaged wiring or connectors, updating the PCM software, or in rare cases, replacing the PCM if it is faulty.

7. How much does it cost to fix the P103E code on a 2017 GMC Sierra?

Repair costs can vary depending on the exact issue but typically range from $150 to $500, including parts and labor, with auxiliary coolant pump replacement being on the higher end.

8. Can a software update resolve the P103E code?

Yes, in some cases, a PCM software update can resolve communication errors and clear the P103E code without requiring hardware replacements.

9. How do I prevent the P103E code from returning?

Regular maintenance, checking the coolant system for leaks or blockages, and ensuring all electrical connections are secure can help prevent the code from reoccurring.

10. Does the P103E code affect fuel economy on a GMC Sierra?

While this code primarily affects the cooling system, it could indirectly impact fuel economy if the engine operates less efficiently due to overheating or thermal management issues.

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