AutoCodes – GMC – P10E3 2018 GMC Sierra

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

Quick Answer

The Engine Control Module (ECM) contains a microprocessor used to process input data to control outputs. Common causes include Faulty Engine Control Module Wake-Up Relay, Engine Control Module Wake-Up Relay harness is open or shorted, Engine Control Module Wake-Up Relay 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: P10E3 2018 GMC Sierra indicates Ignition On/Start Circuit Source Bypass Relay Control Circuit High Voltage.
Common causes: Common causes include Faulty Engine Control Module Wake-Up Relay, Engine Control Module Wake-Up Relay harness is open or shorted, Engine Control Module Wake-Up Relay 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.

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Code Popularity 170

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P10E3 2018 GMC Sierra Description

The Engine Control Module (ECM) contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly. Relays are used to control a high-power circuit with a low power signal. The output circuit is switched to the ground to activate the component. The Diagnostic Trouble Code (DTC) will be set when the Control Circuit is short to voltage for greater than 1 s.

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

What does this mean?

What are the Possible Causes of the DTC P10E3 2018 GMC Sierra?

Faulty Engine Control Module Wake-Up Relay
Engine Control Module Wake-Up Relay harness is open or shorted
Engine Control Module Wake-Up Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P10E3 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 P10E3 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.

Need more information about the P10E3 2018 GMC Sierra code?

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Need Help with the Code?

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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 vehicleâ€™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 isnâ€™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.