P3109
Cylinder 3 High-Pressure Fuel Injector Low Side Circuit Low
P3109 is an OBD-II diagnostic trouble code meaning: Cylinder 3 High-Pressure Fuel Injector Low Side Circuit Low. Common causes: short circuit in injector control circuit, malfunction of the fuel injector of cylinder 3. Estimated repair cost: $28–167.
Symptoms
- Misfire in cylinder 3
- Loss of engine power
- Increased fuel consumption
- Check Engine Light Is On
- Rough engine idling
Causes
- Short circuit in injector control circuit
- Malfunction of the fuel injector of cylinder 3
- Damage to the wiring to the injector
- Problems with the engine control unit (ECU)
- Corrosion of contacts or connectors
How to Fix
- Check the resistance of the injector of cylinder 3
- Inspect the injector wiring and connectors for damage.
- Check injector control circuit for short circuit
- If necessary, replace the fuel injector
- Update engine control unit software (if available)
Related codes
FAQ
What does the P3109 code mean?
P3109 is an OBD-II diagnostic trouble code that indicates: Cylinder 3 High-Pressure Fuel Injector Low Side Circuit Low
What causes a P3109 error code?
The most common causes of P3109 include: Short circuit in injector control circuit; Malfunction of the fuel injector of cylinder 3; Damage to the wiring to the injector; Problems with the engine control unit (ECU).
How do I fix a P3109 diagnostic trouble code?
To fix P3109: Check the resistance of the injector of cylinder 3. Inspect the injector wiring and connectors for damage.. Check injector control circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P3109?
Do not drive — repair immediately
How much does it cost to fix P3109?
The estimated repair cost for P3109 is $28–167. Actual cost depends on your vehicle, location, and labor rates.
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