P2146Fuel Injector Group A Supply Voltage Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Direct-injection and common-rail injectors are fed by a high-side driver in the engine module, often shared by several injectors. P2146 is the open or general fault of the first such supply. GM's 2009 Duramax diesel pairs injectors 1 and 4 in group 1 and sets P2146 when the driver sees an open, short or missing load for 6 ms, type A. VW's 2014 TSI and VR6 engines check the high-side current: below 2.6 A or above 14.9 A. GM petrol direct injection assigns the code to a single cylinder, the high-side control line of cylinder 1; in the Saab 9-5 2.0T a supply fault shared by cylinders 1 and 4 sets P2146 and P2155 together, after 1 s, type B, and the injector is shut off. GM bulletin PIP4924D links it to chafed V6 injector harnesses. Expect misfire and rough running.
- What you may notice
- Misfire on one or more cylinders
- Rough running and loss of power
- Check engine lamp on
- Likely causes
- LikelyInjector harness chafed through or wire open inside insulation
- PossibleLoose, wet or corroded injector connector
- PossibleOpen coil or piezo stack in an injector of the group
- RareFaulty high-side driver in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.