P0277
Cylinder 6 Injector Circuit High
If your vehicle's onboard computer has flagged the diagnostic trouble code P0277, it refers to a detected anomaly regarding "Cylinder 6 Injector Circuit High". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
Your vehicle's computer logged P0277 after detecting a malfunction in the cylinder 6 injector circuit high system. Drivers typically experience flashing check engine light, poor fuel economy when this code is active. Stop driving as soon as it is safe to do so. This fault can lead to expensive secondary damage if left unaddressed.
Symptoms
Flashing check engine light, poor fuel economy
Common Causes
- Short to power in Cyl 6 injector circuit
- Failed fuel injector
- Damaged wiring near hot exhaust components
- Internal PCM short
How to Fix
- 1 Locate and fix shorted wire
- 2 Replace Cyl 6 injector
- 3 Reroute wiring away from heat
- 4 Test PCM voltage
Technical Explanation
Detection of P0277 occurs when the ECM cross-references multiple sensor inputs and determines that the reported values are physically inconsistent or out-of-range. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
Driving with an active P0277 fault risks accelerating damage to short to power 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 P0277, 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.
Related Fault Codes
Frequently Asked Questions
What does OBD2 code P0277 mean?
OBD2 code P0277 refers to Cylinder 6 Injector Circuit High. If your vehicle's onboard computer has flagged the diagnostic trouble code P0277, it refers to a detected anomaly regarding "Cylinder 6 Injector Circuit High". This systemic engine fault needs a targeted check before symptoms expand.
What are the most common symptoms of DTC P0277?
Drivers experiencing code P0277 typically report: Flashing check engine light, poor fuel economy.
Is it safe to drive with trouble code P0277 active?
Driving with an active P0277 fault risks accelerating damage to short to power 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.
How much does it cost to fix code P0277?
The estimated repair cost for P0277 ranges from $100 to $450 USD. Injector: 200 - 450
Injector: 200 - 450
Need Professional Diagnostic Assistance?
Always verify sensor signals and wiring integrity with an OBD2 scanner before purchasing replacement parts.
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