P0276
Cylinder 6 Injector Circuit Low
If your vehicle's onboard computer has flagged the diagnostic trouble code P0276, it refers to a detected anomaly regarding "Cylinder 6 Injector Circuit Low". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
P0276 is triggered when the PCM detects an abnormal condition associated with cylinder 6 injector circuit low. On the road, this usually shows up as misfire code accompanied by injector code, poor drivability. Given the high severity of this code, continuing to drive risks significant mechanical damage. Have it diagnosed immediately.
Symptoms
Misfire code accompanied by injector code, poor drivability
Common Causes
- Short to ground in Cyl 6 injector circuit
- Electrically dead injector
- Loose connector
- Blown fuse
How to Fix
- 1 Perform continuity test and repair wire
- 2 Replace Cyl 6 injector
- 3 Ensure plug clicks into place
- 4 Replace fuse
Technical Explanation
The PCM triggers P0276 after its internal monitoring routine detects that a specific circuit or sensor has exceeded its acceptable operating range. The PCM monitors crankshaft rotational velocity via the CKP sensor at a resolution of individual tooth gaps on the reluctor ring. A combustion event in each cylinder produces a measurable acceleration spike; its absence or weakness is flagged as a misfire event within a 200-revolution or 1000-revolution test window. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
Driving with an active P0276 fault risks accelerating damage to short to ground in cyl 6 injector circuit and related components. The longer the fault persists, the more expensive the eventual repair becomes — what starts as a sensor or solenoid issue can escalate to major mechanical failure.
Mechanic's Pro Tip
When diagnosing P0276, always test fuel volume delivery in addition to static pressure — a pump that holds pressure at idle but delivers insufficient volume under load will cause the fault only during acceleration or high demand, making it difficult to replicate in the driveway. Use a fuel pressure gauge with a volume outlet port: a healthy pump should deliver at least 1 liter per minute. Replace the fuel filter first; it's the cheapest test and solves the fault in a significant percentage of cases.
Injector replacement: 200 - 450