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

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.