OBD-II code · Powertrain (generic, extended)
P2147 Fuel Injector Group A Supply Voltage Circuit Low
The supply voltage measured at injector group A is below the calibrated threshold. Either the supply is shorted to ground or the source voltage has collapsed during cranking or load.
Is it safe to drive with P2147?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySupply wire shorted to ground
- PossibleWeak battery, low cranking voltage
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Injector, Injector Supply Relay, Injector Wiring
Related codes
- P2150Fuel Injector Group B Supply Voltage Circuit Low
- P2153Fuel Injector Group C Supply Voltage Circuit Low
- P2156Fuel Injector Group D Supply Voltage Circuit Low
- P216BFuel Injector Group E Supply Voltage Circuit Low
- P216EFuel Injector Group F Supply Voltage Circuit Low
- P217BFuel Injector Group G Supply Voltage Circuit Low
- P217EFuel Injector Group H Supply Voltage Circuit Low
- P2144EGR Vent Control Circuit Low
- P2145EGR Vent Control Circuit High
- P2146Fuel Injector Group A Supply Voltage Circuit/Open
- P2148Fuel Injector Group A Supply Voltage Circuit High
- P2149Fuel Injector Group B Supply Voltage Circuit/Open
- P214ASCR NOx Catalyst Inlet Temperature Too High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.