P0207
Injector Circuit/Open - Cylinder 7
If your vehicle's onboard computer has flagged the diagnostic trouble code P0207, it refers to a detected anomaly regarding "Injector Circuit/Open - Cylinder 7". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
The diagnostic trouble code P0207 indicates an active fault in the injector circuit/open - cylinder 7 circuit or component. In practice, this fault causes engine shaking, loss of power, check engine light. Given the high severity of this code, continuing to drive risks significant mechanical damage. Have it diagnosed immediately.
Symptoms
Engine shaking, loss of power, check engine light
Common Causes
- Faulty fuel injector on Cylinder 7
- Wiring harness issue
- Corroded injector terminals
- Failed engine computer
How to Fix
- 1 Replace fuel injector
- 2 Repair wiring
- 3 Clean terminals with specialized cleaner
- 4 Replace PCM
Technical Explanation
The ECM detects code P0207 by continuously monitoring the relevant sensor circuit against calibrated threshold values stored in its non-volatile memory. 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. The MIL illuminates after the fault is confirmed on two consecutive drive cycles, and the freeze frame data captured at first detection is stored in the PCM's memory for diagnostic reference.
Is It Safe to Drive?
Driving with an active P0207 fault risks accelerating damage to faulty fuel injector on cylinder 7 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 P0207, 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: $200 - $450