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Engine-Codes – GMC – P10E3 2018 GMC Sierra

P10E3 2018 GMC Sierra Code - Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage

Quick Answer

The diagnostic trouble code P10E3 for a 2018 GMC Sierra indicates a problem with the Ignition On/Start Circuit Source Bypass Relay Control Circuit having high voltage. Common causes include Faulty relay control module, Wiring issues such as shorts or open circuits, Corrosion or poor connections in the relay control circuit. 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
P10E3 2018 GMC Sierra indicates Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage.
Common causes
Common causes include Faulty relay control module, Wiring issues such as shorts or open circuits, Corrosion or poor connections in the relay control circuit.
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 Sep 17, 2024
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Code P10E3 2018 GMC Sierra Description

The diagnostic trouble code P10E3 for a 2018 GMC Sierra indicates a problem with the Ignition On/Start Circuit Source Bypass Relay Control Circuit having high voltage. This code typically points to an issue with the relay control circuit that bypasses the ignition source during the starting process. The relay control circuit is responsible for managing the flow of electricity to various components during the ignition and starting sequence.

OBDII Code P10E3 2018 GMC Sierra - Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage
P10E3 2018 GMC Sierra Code - Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage

Common Causes of P10E3 2018 GMC Sierra

  1. Faulty relay control module
  2. Wiring issues such as shorts or open circuits
  3. Corrosion or poor connections in the relay control circuit
  4. Electrical system malfunctions
  5. Faulty ignition switch

Symptoms of P10E3 2018 GMC Sierra

  1. Intermittent starting issues
  2. Stalling while driving
  3. Complete failure to start
  4. Illumination of the check engine light
  5. Reduced fuel efficiency

How to Fix P10E3 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the high voltage in the relay control circuit using a multimeter and wiring diagrams.
  2. Inspect the relay control module for any signs of damage or malfunction and replace if necessary.
  3. Check all wiring connections in the circuit for corrosion, damage, or poor connections and repair as needed.
  4. Test the ignition switch for proper functionality and replace if found to be faulty.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the vehicle to ensure the issue has been resolved.

Cost to Fix P10E3 2018 GMC Sierra

The cost of repairing the Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage issue can vary depending on the specific cause of the problem. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost is estimated to be between $150 and $500. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at the auto repair shop. It's recommended to consult with a professional mechanic for a more accurate cost 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 P10E3 2018 GMC Sierra Code

1. What does the OBDII code P10E3 mean on a 2018 GMC Sierra?

The P10E3 code indicates a high voltage issue in the Ignition On/Start Circuit Source Bypass Relay Control Circuit, which could affect the vehicle’s ignition system.

2. What are the common symptoms of code P10E3 on a 2018 GMC Sierra?

Symptoms may include difficulty starting the engine, intermittent stalling, a no-start condition, or the Check Engine Light being illuminated.

3. What causes the P10E3 code on a 2018 GMC Sierra?

Common causes include a faulty bypass relay, damaged wiring or connectors in the circuit, a malfunctioning ignition switch, or a failing powertrain control module (PCM).

4. Can a faulty battery cause the P10E3 code on a 2018 GMC Sierra?

Yes, a weak or failing battery can cause electrical issues, potentially triggering this code.

5. How can I diagnose the P10E3 code on my 2018 GMC Sierra?

Start by using an OBDII scanner to confirm the code, inspect the bypass relay and its wiring for damage, check for loose connectors, and test the ignition switch for proper operation.

6. Is it safe to drive with the P10E3 code on a 2018 GMC Sierra?

Driving with this code is not recommended, as it may lead to starting issues or sudden stalling, which can be unsafe.

7. How do I fix the P10E3 code on my 2018 GMC Sierra?

Repairs may involve replacing the bypass relay, repairing or replacing damaged wiring, cleaning or securing connectors, or reprogramming/replacing the PCM if necessary.

8. Can clearing the P10E3 code solve the problem?

Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue isn’t resolved, the code will likely return.

9. How much does it cost to fix the P10E3 code on a 2018 GMC Sierra?

Repair costs vary depending on the cause. Replacing a relay or fixing wiring may cost $50-$200, while PCM repairs or replacements can exceed $500.

10. Can I repair the P10E3 code on my 2018 GMC Sierra myself?

If you are comfortable working with electrical systems, you may be able to inspect and repair wiring or replace a relay. However, complex issues like PCM reprogramming should be handled by a professional.

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