Trouble codes · P2146

P2146 meaning

Fuel Injector Group A Supply Voltage Circuit/Open

The same first verdict Car Assist shows from this code alone, before a diagnosis. The code does not tell the app whether the warning light is flashing.

What this code doesn’t tell you

A code says where the car noticed a problem. It does not prove which part failed, whether the fault is still present, or what repair this car needs. The engine, other codes, freeze frame and live readings matter.

Usual causes, most likely first

The order is a starting point across cars; the exact engine and its readings can change it.

1. Shorted injector or injector wiring in that group
2. Damaged injector harness or connector
3. Injector driver fault in the engine computer

What you can check

Note misfires or rough running and any other injector codes. With the engine off and cold, look for a disturbed connector after recent work; have the circuit tested before replacing injectors.

Words the car uses

Stored codes

Faults the car has confirmed and saved. They help explain a check-engine light, but a code alone does not prove which part needs replacing.

Freeze frame

A snapshot of the engine's readings when a fault was recorded. It helps show the conditions that caused the fault, even if the car now seems fine.

Readiness monitors

The car's own checks of its emissions systems. An unfinished check means the car has not tested that system yet, so a clean code scan may miss a fault.

Fuel supply pressure

The pressure supplying fuel to the engine. Too little or too much can cause hard starting or poor running.

Battery and ECU volts

The electrical supply measured at the adapter or a car computer (ECU). Low readings can explain starting problems or unreliable diagnostic connections.

Find out what’s causing yours

Car Assist reads your car through an OBD-II adapter and your iPhone. Its assistant uses the codes, freeze frame and live readings to work through the likely cause with you.

Find out what’s causing yours