OBD-II code · Powertrain (generic, extended)
P2148 Fuel Injector Group A Supply Voltage Circuit High
The injector group A supply voltage exceeds the calibrated upper limit. Often a sign of a short to battery voltage on the supply line, an over-charging alternator or an internal driver failure.
Is it safe to drive with P2148?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to battery voltage
- Less likelyCharging system overvoltage
- 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 Wiring, Alternator
Related codes
- P2151Fuel Injector Group B Supply Voltage Circuit High
- P2154Fuel Injector Group C Supply Voltage Circuit High
- P2157Fuel Injector Group D Supply Voltage Circuit High
- P216CFuel Injector Group E Supply Voltage Circuit High
- P216FFuel Injector Group F Supply Voltage Circuit High
- P217CFuel Injector Group G Supply Voltage Circuit High
- P217FFuel Injector Group H Supply Voltage Circuit High
- P2145EGR Vent Control Circuit High
- P2146Fuel Injector Group A Supply Voltage Circuit/Open
- P2147Fuel Injector Group A Supply Voltage Circuit Low
- P2149Fuel Injector Group B Supply Voltage Circuit/Open
- P214ASCR NOx Catalyst Inlet Temperature Too High
- P214BSCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.