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P0203 Mercedes-Benz Code - Injector Circuit/Open Cylinder 3

- Code Popularity: 18,603 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0203 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Injector #3
  • Fuel Injector 3 harness is open or shorted
  • Fuel Injector #3 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P0203 Mercedes-Benz?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

Mercedes Benz Code = 0311 The injection valve output stage of cylinder 3 detects a line discontinuity. (P0203)

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0203 Mercedes-Benz code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/Loss of Power
  • The engine may be harder to start
  • Engine hesitation

Code P0203 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when the injector control circuit does not behave as expected. The ECM uses the induced voltage from the injector to indicate that the fuel injector circuit is operating correctly electrically. It does not signal the mechanical condition of the injector. When the ECM opens the ground circuit for an injector (to cease current flow) a voltage is induced into the winding. This voltage shows the electrical integrity of the injector and associated wiring. Absence of this induced voltage results in a fault code being stored in the ECM. This code is generated if the fault is associated with cylinder 3.

OBDII Code P0203 Mercedes-Benz - Injector Circuit/Open Cylinder 3 - AutoCodes.com
P0203 Mercedes-Benz Code - Injector Circuit/Open Cylinder 3

Need More Information on the Code?

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