OBD-II code · Powertrain (generic)
P0279 Cylinder 7 Injector A Circuit Low
Cylinder 7 injector A control voltage below expected range. A flow-deviating injector throws off cylinder balance — adjacent cylinders run leaner/richer to compensate, often masking the root cause until the trim limit is hit.
Is it safe to drive with P0279?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Injector Cyl7, Injector Wiring
Related codes
- P0276Cylinder 6 Injector A Circuit Low
- P0282Cylinder 8 Injector A Circuit Low
- P0285Cylinder 9 Injector A Circuit Low
- P0288Cylinder 10 Injector A Circuit Low
- P0291Cylinder 11 Injector A Circuit Low
- P0294Cylinder 12 Injector A Circuit Low
- P21DBCylinder 1 Injector B Circuit Low
- P21DECylinder 2 Injector B Circuit Low
- P21E0Cylinder 3 Injector B Circuit Low
- P21E2Cylinder 4 Injector B Circuit Low
- P21E4Cylinder 5 Injector B Circuit Low
- P21E6Cylinder 6 Injector B Circuit Low
- P0277Cylinder 6 Injector A Circuit High
- P0278Cylinder 6 Contribution/Balance
- P027AFuel Pump Module B Control Circuit/Open
- P027BFuel Pump Module B Control Circuit Range/Performance
- P027CFuel Pump Module B Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.