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

Quick Answer

The P0650 code for Mercedes-Benz indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit. Common causes include Faulty wiring or connectors in the control circuit, Malfunctioning Malfunction Indicator Lamp, Issues with the engine control module (ECM). 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 wiring or connectors in the control circuit, Malfunctioning Malfunction Indicator Lamp, Issues with the engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0650 Mercedes-Benz Description

The P0650 code for Mercedes-Benz indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit. The Malfunction Indicator Lamp, also known as the Check Engine Light, is an important component of a vehicle's onboard diagnostics system. When this light illuminates, it typically signifies an issue with the vehicle's emissions system, engine performance, or other critical systems.

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

Common Causes of P0650 Mercedes-Benz

  1. Faulty wiring or connectors in the control circuit.
  2. Malfunctioning Malfunction Indicator Lamp.
  3. Issues with the engine control module (ECM).
  4. Corrosion or damage to the control circuit components.
  5. Electrical shorts or open circuits in the system.

Symptoms of P0650 Mercedes-Benz

  1. Check Engine Light does not illuminate when starting the vehicle.
  2. Check Engine Light stays on constantly, regardless of driving conditions.
  3. Loss of communication with the onboard diagnostic system.
  4. Decreased fuel efficiency.

How to Fix P0650 Mercedes-Benz

  1. Diagnose the specific cause of the P0650 code using a diagnostic scanner.
  2. Inspect the wiring and connectors in the control circuit for any damage or corrosion.
  3. Test the Malfunction Indicator Lamp to ensure it is functioning correctly.
  4. Check the engine control module (ECM) for any malfunctions or errors.
  5. Repair or replace any faulty components in the control circuit as needed.

Cost to Fix P0650 Mercedes-Benz

The cost of repairing a P0650 code on a Mercedes-Benz can vary depending on the specific cause of the issue and the labor rates of the repair shop. On average, the repair cost for this issue can range from $150 to $400, including parts and labor. It's important to note that diagnostic time and labor rates can vary based on location, vehicle make and model, and the expertise of the mechanic. It is recommended to get a detailed estimate from a qualified repair shop to determine the exact cost for addressing this code.

When is the Code Detected?

- An excessively high voltage is sent to Engine Control Module (ECM) through the MIL circuit under the condition that calls for MIL light up.
- An excessively low voltage is sent to ECM through the MIL circuit under the condition that calls for MIL not to light up.

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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.

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