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P0268 is a diagnostic trouble code (DTC) for "Cylinder number 3 Injector Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Cylinder number 3 Injector Circuit High
P0268 is an OBD-II diagnostic trouble code that is stored when the engine control module (ECM) detects that the cylinder number 3 injector circuit has a high resistance short circuit to power or short to ground.
The number three cylinder injector circuit has a short somewhere in the circuit from the ECM to the injector. This includes the wiring and connections.
The number three injector is shorted electrically internally causing the circuit high current condition.
The fuel injector pins are bent or broken in the injector or harness connection causing a short to power or ground.
The injector wiring is shorted to power or ground (this may also short out components).
The injector control module or ECM has a shorted internal circuit.
The Check Engine Light will be illuminated and code P0268 set in ECM memory and freeze frame.
The engine will run rough and low on power due to the inoperative injector.
The engine will have a misfire causing a buck or jerk and a rough idle.
The engine may lack some power during acceleration when the misfire is active if the short is intermittent.
The Engine may stall or have other drivability symptoms related to a misfiring defective injector.
If the short is on a main harness, then there may be other circuits having issues if the short is to another circuit.
Scans codes and documents the freeze frame data in order to verify the problem
Clears the engine trouble codes and road tests the vehicle to verify concern and code returns
Runs an injector electrical self test to verify fault to number 3 injector or harness circuit (following the pinpoint test procedures for the vehicle’s application)
Disconnects the injector and measure resistances of the injector to see if the injector is shorted internally (following the pinpoint tests for the vehicle)
Disconnects the ECM or injector module and measures the wires’ resistances from the injector connector to the ECM or injector module connector and ground to see if harness is shorted
Replaces the injector or ECM injector module as needed if the failure is inside the injector or control module (following the pinpoint tests)
Replacing the injector if it has shorted and failed the resistance tests (should be installed with new injector seals)
Repairing the wiring or connections between the injector and ECM or injector module for a shorted harness
Replacing the ECM or injector module, depending on application, for an internal short or if the injector shorted the internal circuit
Code P0268 is triggered when the ECM or injector module sees the number 3 injector resistance or milliamp draw is high due to a circuit short and turns on the light and sets the code. On some shorts the injector may short internally and also short out the control module. This would require the replacement of the injector and control module plus verification that the harness is not shorted.
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