AutoCodes – GMC – P0650 GMC

P0650 GMC Code - Malfunction Indicator Lamp Control Circuit

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: P0650 GMC indicates Malfunction Indicator Lamp Control Circuit.
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 40,006

How popular is this code, among other codes? Medium

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0650 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 P0650 GMC - Malfunction Indicator Lamp Control Circuit - AutoCodes.com — P0650 GMC Code - Malfunction Indicator Lamp Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0650 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 P0650 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 P0650 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.

Need more information about the P0650 GMC code?

Need more information on how to fix the P0650 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0650 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0650 2014 GMC Sierra — Malfunction Indicator Lamp Control Circuit
P0650 2015 GMC Sierra — Malfunction Indicator Lamp Control Circuit
P0650 2016 GMC Sierra — Malfunction Indicator Lamp Control Circuit
P0650 2017 GMC Sierra — Malfunction Indicator Lamp Control Circuit
P0650 2018 GMC Sierra — Malfunction Indicator Lamp Control Circuit

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 P0650 GMC Code

1. What are common symptoms of OBDII code P0650 in a GMC vehicle?

The most common symptom is the Malfunction Indicator Lamp (MIL) or Check Engine Light staying illuminated on the dashboard.

2. What does the OBDII code P0650 indicate in a GMC vehicle?

Code P0650 indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit.

3. What are possible causes of OBDII code P0650 in a GMC vehicle?

Possible causes include a faulty Malfunction Indicator Lamp (MIL), damaged wiring or connectors in the control circuit, or a malfunctioning PCM (Powertrain Control Module).

4. How serious is OBDII code P0650 in a GMC vehicle?

While the vehicle may still operate, it is important to address this code promptly as it indicates a problem with the control circuit of the Malfunction Indicator Lamp (MIL).

5. Can OBDII code P0650 be fixed by resetting the check engine light?

Simply resetting the check engine light will not fix the underlying issue causing code P0650. Proper diagnostics and repairs are necessary to address the root cause.

6. How can I diagnose OBDII code P0650 in my GMC vehicle?

Diagnosis typically involves using an OBDII scanner to read the code, checking the wiring and connectors related to the Malfunction Indicator Lamp (MIL), and testing the PCM for proper function.

7. Is it safe to continue driving with OBDII code P0650 present in a GMC vehicle?

While the vehicle may still be operational, it is recommended to address the issue promptly to prevent potential problems and ensure proper functioning of the Malfunction Indicator Lamp (MIL).

8. Can I repair OBDII code P0650 in my GMC vehicle myself?

The complexity of the repair depends on the underlying cause. Simple fixes like checking and repairing wiring connections may be DIY-friendly, but diagnosing and replacing a faulty PCM may require professional assistance.

9. Will OBDII code P0650 cause my GMC vehicle to fail an emissions test?

Since the code indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit, it is possible that it may cause the vehicle to fail an emissions test due to improper monitoring of emissions-related systems.

10. How much does it typically cost to repair OBDII code P0650 in a GMC vehicle?

Repair costs can vary depending on the cause of the issue. Simple fixes like repairing wiring connections may be relatively inexpensive, while replacing a faulty PCM can be more costly. It is advisable to obtain a professional diagnosis for an accurate cost estimate.

1. What does OBDII code P0650 GMC mean?

The P0650 code in a GMC vehicle indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit.

2. What are the common symptoms of OBDII code P0650 GMC?

Common symptoms of code P0650 include the Check Engine Light staying illuminated or the MIL indicator not working correctly.

3. What are the possible causes of OBDII code P0650 GMC?

Possible causes of code P0650 can include a faulty MIL control circuit, a blown fuse, a malfunctioning PCM, or wiring issues.

4. How do I diagnose OBDII code P0650 GMC?

Diagnosing code P0650 involves using a diagnostic scanner to read the code, checking the MIL circuit for continuity, inspecting the wiring, and testing the PCM for proper operation.

5. Can I continue driving with OBDII code P0650 GMC?

While the vehicle may still be operable with code P0650, it is recommended to address the issue promptly to prevent potential performance problems or further damage to the vehicle.

6. How do I repair OBDII code P0650 GMC?

Repairing code P0650 may involve replacing a faulty MIL control circuit, repairing damaged wiring, replacing blown fuses, or addressing any PCM issues.

7. Can I reset the OBDII code P0650 GMC on my own?

You can reset the P0650 code using an OBDII scanner, but it is important to diagnose and fix the underlying issue first to prevent the code from reappearing.

8. Will OBDII code P0650 GMC cause my vehicle to fail an emissions test?

Code P0650 can potentially cause your vehicle to fail an emissions test, as it is related to the functionality of the Malfunction Indicator Lamp, which is crucial for emissions monitoring.

9. How much does it cost to repair OBDII code P0650 GMC at a mechanic?

The cost of repairing code P0650 can vary depending on the specific underlying issue, parts needed, labor costs, and the mechanic's hourly rate.

10. Are there any preventive measures to avoid OBDII code P0650 GMC in the future?

To prevent code P0650 in the future, it is recommended to regularly inspect and maintain the vehicle's electrical system, including checking fuses, wiring, and components related to the Malfunction Indicator Lamp circuit.