AutoCodes – Chevrolet – P263B Chevrolet

P263B Chevrolet 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 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: P263B Chevrolet indicates Malfunction Indicator Lamp Control Circuit High 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 1,501

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 Chevrolet 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 Chevrolet - Malfunction Indicator Lamp Control Circuit High Voltage - AutoCodes.com — P263B Chevrolet Code - Malfunction Indicator Lamp Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P263B Chevrolet?

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 P263B Chevrolet?

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 Chevrolet 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 Chevrolet code?

Need more information on how to fix the P263B Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Chevrolet Models

P263B 2014 Chevrolet Silverado — Malfunction Indicator Lamp Control Circuit High Voltage
P263B 2015 Chevrolet Silverado — Malfunction Indicator Lamp Control Circuit High Voltage
P263B 2016 Chevrolet Silverado — Malfunction Indicator Lamp Control Circuit High Voltage
P263B 2017 Chevrolet Silverado — Malfunction Indicator Lamp Control Circuit High Voltage
P263B 2018 Chevrolet Silverado — Malfunction Indicator Lamp Control Circuit High 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 P263B Chevrolet Code

What does the OBDII code P263B mean for a Chevrolet vehicle?

The P263B code indicates a problem with the Malfunction Indicator Lamp (MIL) control circuit, specifically that there is high voltage detected in the circuit.

What are the common symptoms of the P263B code?

Common symptoms include the illumination of the check engine light, malfunction indicator lamp not turning on, and possibly reduced engine performance.

What could cause the P263B code to set?

Possible causes include a faulty MIL control circuit, a defective engine control module (ECM), wiring issues, or a short circuit in the MIL circuit.

How can I diagnose the P263B code?

Start by using an OBDII scanner to confirm the code. Inspect the wiring and connectors for damage, check the voltage at the MIL circuit, and test the ECM for faults.

What are some common repairs for the P263B code?

Repairs may include fixing or replacing damaged wiring or connectors, replacing a faulty MIL bulb, or replacing the ECM if it is determined to be defective.

Can I drive my car with the P263B code?

While it's possible to drive the vehicle, it is not recommended as the check engine light may indicate other underlying issues, and it could lead to further damage.

How do I reset the P263B code after repairs?

After addressing the issue, you can reset the code using an OBDII scanner or by disconnecting the battery for a few minutes, though this may also reset other stored codes.

Is the P263B code specific to certain Chevrolet models?

The P263B code can be found in various Chevrolet models but may not be exclusive to them; it can apply to other manufacturers as well.

What should I do if the P263B code keeps returning?

If the code persists after repairs, further diagnostics may be necessary to identify underlying issues such as intermittent wiring faults or a malfunctioning ECM that wasn't initially detected.