Fault code P0268 – a step-by-step guide to diagnosing and fixing it

Error code P0268 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the injection valve of cylinder 3, which is classified as "Injector Circuit High". This DTC P0268 trouble code indicates excessive voltage or a short circuit in the electrical circuit of the third injector. This fault code may have slightly different names for different manufacturers, but always refers to the same problem.

What causes can this fault code have?

• Defective injection valve cylinder 3
• Short circuit in the wiring to the injector
• Damaged plug connection on the injection valve
• Defective engine control unit (ECU)
• Corroded or oxidized contacts
• Broken ground wire
• Faulty fuel pump with excessive pressure
• Defective fuel pressure regulator

What symptoms occur in parallel with fault code P0268?

• Engine running unsteadiness: Uneven idling and jerky engine
• Loss of power: Reduced engine power, especially when accelerating
• Increased fuel consumption: Poorer fuel efficiency due to incomplete combustion
• Misfiring: Misfiring in the third cylinder
• Starting problems: Difficulty starting the engine, especially in cold weather
• Black smoke: Dark exhaust fumes due to incomplete combustion

How to fix the problem of error code P0268?

• Repairing EOBD error code P0268 requires a systematic approach to identify the exact cause.
• Replace the defective injection valve of cylinder 3 with a new or reconditioned valve after checking the wiring
• Repair damaged cables or connectors in the injector circuit by replacing the affected cables and using new connectors
• Clean corroded contacts with contact spray and seal the connections with dielectric grease to prevent future corrosion
• Check and replace the engine control unit if all other components are working properly and the code persists
• Measure the fuel pressure and replace the fuel pressure regulator or fuel pump if necessary
• Perform a complete diagnosis of the fuel system and replace the fuel filter if clogged