Injector Circuit/Open Cylinder 3
Table of contents
P0203 MERCEDES-BENZ Possible 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)
How do I fix code P0203 MERCEDES-BENZ?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- Mercedes Benz Code = 0311 The injection valve output stage of cylinder 3 detects a line discontinuity. (P0203)
Cost of diagnosing the P0203 MERCEDES-BENZ code
The cost of diagnosing the P0203 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- The engine may be harder to start
- Engine hesitation
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.