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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Wire shorted to battery voltageCommon
- Charging system overvoltageLess likely
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Fuel Injector
- Injector Wiring
- Alternator
P2148 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.