AutoCodes – GMC – P263B 2018 GMC Sierra

P263B 2018 GMC Sierra Code - Malfunction Indicator Lamp Control Circuit High Voltage

Quick Answer

The Malfunction Indicator Lamp (MIL) illuminates to inform the driver that an emission system fault has occurred, and the powertrain control system requires service. Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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: P263B 2018 GMC Sierra indicates Malfunction Indicator Lamp Control Circuit High Voltage.
Common causes: Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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 240

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 Jul 18, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P263B 2018 GMC Sierra Description

The Malfunction Indicator Lamp (MIL) illuminates to inform the driver that an emission system fault has occurred, and the powertrain control system requires service. Ignition voltage is supplied directly to the MIL. The Engine Control Module (ECM) turns the MIL ON by grounding the MIL control circuit when the emission system fault occurs. Under normal operating conditions, the MIL should be ON only when the ignition is ON, and the engine is OFF. The Diagnostic Trouble Code (DTC) will be set when the ECM detects high voltage on the MIL control circuit during the driver ON state. This indicates a shorted to voltage MIL control circuit.

OBDII Code P263B 2018 GMC Sierra - Malfunction Indicator Lamp Control Circuit High Voltage - AutoCodes.com — P263B 2018 GMC Sierra Code - Malfunction Indicator Lamp Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P263B 2018 GMC Sierra?

Faulty Instrument Cluster
Instrument Cluster harness is open or shorted
Instrument Cluster circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P263B 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 does this mean?

Code Tech Notes

If the condition is intermittent, move the related harnesses and connectors while monitoring the scan tool MIL control circuit status parameters. Perform this test with the ignition ON and the engine OFF, and with the engine running. The MIL control circuit status parameters change from OK or Not Run to Malfunction if there is a condition with a circuit or a connection.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P263B 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 P263B 2018 GMC Sierra 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 P263B 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P263B in a 2018 GMC Sierra?

The common symptoms associated with code P263B include the illumination of the Malfunction Indicator Lamp (MIL) or Check Engine Light on the vehicle's dashboard.

2. What does the OBDII code P263B indicate in a 2018 GMC Sierra?

Code P263B indicates a high voltage condition in the Malfunction Indicator Lamp (MIL) control circuit of the vehicle.

3. What are the possible causes of OBDII code P263B in a 2018 GMC Sierra?

Possible causes of code P263B in a 2018 GMC Sierra may include a faulty Malfunction Indicator Lamp (MIL) control circuit, wiring issues, or a malfunctioning control module.

4. How serious is OBDII code P263B in a 2018 GMC Sierra?

While code P263B may not cause immediate drivability issues, it is important to address the underlying problem to prevent potential issues with the vehicle's diagnostics system.

5. How can I diagnose OBDII code P263B in a 2018 GMC Sierra?

Diagnosing code P263B typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connections related to the Malfunction Indicator Lamp (MIL) control circuit, and testing the control module.

6. Can I continue driving my 2018 GMC Sierra with OBDII code P263B?

It is generally safe to drive your vehicle with code P263B, but it is recommended to have the issue diagnosed and repaired at your earliest convenience to prevent any potential problems with the vehicle's diagnostics system.

7. How can I repair OBDII code P263B in a 2018 GMC Sierra?

Repairing code P263B may involve repairing or replacing the Malfunction Indicator Lamp (MIL) control circuit, addressing any wiring issues, or replacing a faulty control module as necessary.

8. Will resetting the OBDII code P263B in a 2018 GMC Sierra make it go away permanently?

Simply resetting the code may temporarily turn off the Malfunction Indicator Lamp (MIL), but if the underlying issue is not addressed, the code is likely to reappear. It is recommended to diagnose and repair the root cause of the code.

9. Can a DIY enthusiast fix OBDII code P263B in a 2018 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing complex electrical issues like code P263B may require specialized tools and expertise. It is advisable to consult a professional mechanic for proper diagnosis and repair.

10. How much can I expect to pay to fix OBDII code P263B in a 2018 GMC Sierra?

The cost of repairing code P263B can vary depending on the specific cause of the issue, labor rates in your area, and whether any parts need to be replaced. It is advisable to obtain quotes from reputable mechanics to get an accurate estimate.