AutoCodes – GMC – P263A GMC

P263A GMC Code - Malfunction Indicator Lamp Control Circuit Low 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 Malfunction Indicator Lamp Bulb, Malfunction Indicator Lamp Bulb harness is open or shorted, Malfunction Indicator Lamp Bulb 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: P263A GMC indicates Malfunction Indicator Lamp Control Circuit Low Voltage.
Common causes: Common causes include Faulty Malfunction Indicator Lamp Bulb, Malfunction Indicator Lamp Bulb harness is open or shorted, Malfunction Indicator Lamp Bulb 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 1,214

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 P263A GMC 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 low voltage during the MIL control circuit driver OFF state. This indicates either a shorted to ground or an open MIL control circuit.

OBDII Code P263A GMC - Malfunction Indicator Lamp Control Circuit Low Voltage - AutoCodes.com — P263A GMC Code - Malfunction Indicator Lamp Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P263A GMC?

Faulty Malfunction Indicator Lamp Bulb
Malfunction Indicator Lamp Bulb harness is open or shorted
Malfunction Indicator Lamp Bulb circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P263A GMC?

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 P263A GMC 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.

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Information for Specific GMC Models

P263A 2014 GMC Sierra — Malfunction Indicator Lamp Control Circuit Low Voltage
P263A 2015 GMC Sierra — Malfunction Indicator Lamp Control Circuit Low Voltage
P263A 2016 GMC Sierra — Malfunction Indicator Lamp Control Circuit Low Voltage
P263A 2017 GMC Sierra — Malfunction Indicator Lamp Control Circuit Low Voltage
P263A 2018 GMC Sierra — Malfunction Indicator Lamp Control Circuit Low Voltage

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 P263A GMC Code

1. What does the OBDII code P263A mean on a GMC?

P263A indicates a low voltage issue in the Malfunction Indicator Lamp (MIL) Control Circuit, which is responsible for illuminating the check engine light.

2. What are the common symptoms of a P263A code on a GMC vehicle?

Symptoms include the check engine light not functioning properly, potential drivability issues, and stored error codes that may not trigger the MIL.

3. What causes the P263A code to appear on a GMC?

Common causes include a faulty MIL bulb or LED, wiring issues such as short circuits or corrosion, a failing engine control module (ECM), or poor electrical connections in the MIL circuit.

4. How do I diagnose the P263A code on my GMC?

Start by checking the MIL bulb or LED for proper operation, inspect wiring for damage or loose connections, and test the voltage in the MIL control circuit using a multimeter.

5. Can I still drive my GMC with a P263A code?

While the vehicle may still be drivable, the check engine light may not work as intended, potentially masking other issues. Itâ€™s best to address the code promptly.

6. How do I fix the P263A code on a GMC?

Repairs may include replacing a burnt-out MIL bulb, repairing or replacing damaged wiring, cleaning corroded connections, or, in rare cases, replacing the ECM.

7. How much does it cost to repair a P263A code on a GMC?

Costs vary depending on the repair, but replacing a bulb or fixing a wiring issue is typically inexpensive, while ECM replacement could cost several hundred dollars.

8. Can a dead battery cause the P263A code on a GMC?

Yes, a weak or dead battery can lead to low voltage in the MIL control circuit, triggering the P263A code.

9. Will clearing the code fix the P263A issue on my GMC?

Clearing the code will turn off the check engine light temporarily, but if the underlying issue isnâ€™t resolved, the code will return.

10. Is the P263A code specific to GMC vehicles?

No, the P263A code can appear on vehicles from other manufacturers, but the diagnostics and repairs may vary slightly depending on the make and model.