P0285
Cylinder 9 Injector A Circuit Low
P0285 is an OBD-II diagnostic trouble code meaning: Cylinder 9 Injector A Circuit Low. Common causes: injector wire short circuit to ground, broken injector power wire. Estimated repair cost: $33–222.
Symptoms
- Misfire in cylinder 9
- Engine vibration
- Power reduction
- Check Engine light comes on (possibly flashing)
- Smell of unburned fuel from the exhaust
Causes
- Injector wire short circuit to ground
- Broken injector power wire
- Internal short circuit of the injector winding
- Damage to the wiring harness near the exhaust manifold
- ECU transistor switch malfunction
How to Fix
- Read codes and record misfire codes (P0309)
- Measure the resistance of the injector of cylinder 9 (standard 12–16 Ohms)
- Check the supply voltage at the injector connector
- Inspect the injector wiring harness for thermal damage.
- Check the harness for breaks and short to ground
- If wiring and injectors are excluded - ECU diagnostics
Related codes
Error P0285 by Vehicle Brand
FAQ
What does the P0285 code mean?
P0285 is an OBD-II diagnostic trouble code that indicates: Cylinder 9 Injector A Circuit Low
What causes a P0285 error code?
The most common causes of P0285 include: Injector wire short circuit to ground; Broken injector power wire; Internal short circuit of the injector winding; Damage to the wiring harness near the exhaust manifold.
How do I fix a P0285 diagnostic trouble code?
To fix P0285: Read codes and record misfire codes (P0309). Measure the resistance of the injector of cylinder 9 (standard 12–16 Ohms). Check the supply voltage at the injector connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0285?
Yes, but get it checked soon
How much does it cost to fix P0285?
The estimated repair cost for P0285 is $33–222. Actual cost depends on your vehicle, location, and labor rates.
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