OBD-II code · Powertrain (generic, extended)
P21E7 Cylinder 6 Injector B Circuit High
Cylinder 6 second-injector (B) drive line stuck high — short to B+. 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 P21E7?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Injector
Related codes
- P21D4Cylinder 6 Injector B Circuit/Open
- P21DCCylinder 1 Injector B Circuit High
- P21DFCylinder 2 Injector B Circuit High
- P21E1Cylinder 3 Injector B Circuit High
- P21E3Cylinder 4 Injector B Circuit High
- P21E5Cylinder 5 Injector B Circuit High
- P21E9Cylinder 7 Injector B Circuit High
- P21EBCylinder 8 Injector B Circuit High
- P21EDCylinder 9 Injector B Circuit High
- P21EFCylinder 10 Injector B Circuit High
- P21F1Cylinder 11 Injector B Circuit High
- P21F3Cylinder 12 Injector B Circuit High
- P21E4Cylinder 5 Injector B Circuit Low
- P21E6Cylinder 6 Injector B Circuit Low
- P21E8Cylinder 7 Injector B Circuit Low
- P21EACylinder 8 Injector B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.