What does it mean?
P1295 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Injector Circuit High to Low Current Transition Time Bank 1 .
Symptoms
- MIL (check engine lamp) on
- Misfire, rough idle and noticeable vibration
- Rich exhaust smell or smoke, since the injector stays open longer than commanded
- Higher fuel consumption and sooty spark plugs or nozzle tips
- Hesitation and hard starting
Likely causes
- Partially shorted turns inside a Bank 1 injector solenoid
- Chafed harness leaking current to ground as the injector switches off
- Faulty flyback or quench circuit in the injector driver module
- Corroded, loose or wet injector connector terminals
- Poor module ground or low system voltage distorting the switching waveform
- Aftermarket wiring, added devices or a poor repair splice in the injector circuit
How to fix it
- Record the freeze frame and check for related injector and misfire codes
- Inspect the Bank 1 injector harness for chafe points, poor splices and moisture in the connectors
- Measure each injector's resistance and also check for continuity between the winding and the injector body
- Voltage drop test the injector ground path and verify the driver module ground is clean and tight
- Capture an injector current waveform and compare the turn-off slope between cylinders where a scope is available
- Replace the injector with abnormal switching behaviour, or repair the harness fault
- Re-check the driver module only after the injectors, wiring and grounds are proven