AutoCodes – Mercedes-Benz – P0650 Mercedes-Benz

P0650 Mercedes-Benz Code - Malfunction Indicator Lamp Control Circuit Malfunction

Quick Answer

Malfunction Indicator Lamp (MIL) is located on the instrument panel. 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 Mercedes-Benz indicates Malfunction Indicator Lamp Control Circuit Malfunction.
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 8,538

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0650 Mercedes-Benz Description

Malfunction Indicator Lamp (MIL) is located on the instrument panel. When the ignition switch is turned ON without engine running, MIL will light up. This is a bulb check. When the engine is started, MIL should go off. If MIL remains on, the on board diagnostic system has detected an engine system malfunction.

OBDII Code P0650 Mercedes-Benz - Malfunction Indicator Lamp Control Circuit Malfunction - AutoCodes.com — P0650 Mercedes-Benz Code - Malfunction Indicator Lamp Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0650 Mercedes-Benz?

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 Mercedes-Benz?

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 P0650 Mercedes-Benz 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 Mercedes-Benz 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 P0650 Mercedes-Benz Code

1. What does the OBDII code P0650 mean on a Mercedes-Benz?

P0650 indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit, which is responsible for illuminating the check engine light when an issue is detected.

2. What are the common symptoms of a P0650 code on a Mercedes-Benz?

Symptoms may include the check engine light not turning on during startup, the MIL remaining off even when problems exist, or erratic illumination of the warning light.

3. What causes the P0650 code on a Mercedes-Benz?

Common causes include a faulty MIL bulb or LED, damaged wiring or connectors in the MIL circuit, a defective instrument cluster, or issues with the engine control module (ECM).

4. Can I drive my Mercedes-Benz with a P0650 code?

While a P0650 code may not immediately impact drivability, it can prevent the check engine light from signaling other critical issues. Prompt diagnosis and repair are recommended.

5. How do I diagnose a P0650 code on a Mercedes-Benz?

Start by checking the MIL bulb or LED for proper function, inspect the wiring and connectors for damage or corrosion, and use a diagnostic scanner to test the ECM and instrument cluster.

6. How is the P0650 code typically fixed on a Mercedes-Benz?

Repairs may include replacing a burnt-out MIL bulb, repairing or replacing damaged wiring or connectors, reprogramming or replacing the ECM, or addressing faults in the instrument cluster.

7. Does a P0650 code always mean the ECM is faulty?

No, the ECM is only one possible cause. The issue could also be related to the MIL bulb, instrument cluster, or wiring in the control circuit.

8. How much does it cost to repair a P0650 code on a Mercedes-Benz?

Repair costs vary depending on the cause. Replacing a MIL bulb or repairing wiring may cost under $100, while ECM or instrument cluster replacements can cost hundreds or more.

9. Can a faulty MIL bulb trigger a P0650 code on a Mercedes-Benz?

Yes, a burnt-out or malfunctioning MIL bulb or LED is a common cause of this code.

10. Will clearing the P0650 code fix the problem on a Mercedes-Benz?

Clearing the code may temporarily turn off the warning but will not fix the underlying issue. Proper diagnosis and repair are necessary to resolve the problem permanently.