P21F3
Cylinder 12 Injector B Circuit High
P21F3 is an OBD-II diagnostic trouble code meaning: Cylinder 12 Injector B Circuit High. Common causes: injector circuit short circuit to power, broken or damaged wiring to the injector. Estimated repair cost: $22–89.
Symptoms
- Uneven engine operation
- Power Loss
- Increased fuel consumption
- Check Engine Light Is On
- Possible misfire in cylinder 12
Causes
- Injector circuit short circuit to power
- Broken or damaged wiring to the injector
- Malfunction of the injector itself
- Problems with the engine control unit
- Corrosion or poor contact in the injector connector
How to Fix
- Check the integrity of the wiring harness to the injector
- Measure the injector resistance
- Check the voltage in the injector control circuit
- If necessary, replace the injector
- Check connectors and contacts for corrosion
Related codes
Error P21F3 by Vehicle Brand
FAQ
What does the P21F3 code mean?
P21F3 is an OBD-II diagnostic trouble code that indicates: Cylinder 12 Injector B Circuit High
What causes a P21F3 error code?
The most common causes of P21F3 include: Injector circuit short circuit to power; Broken or damaged wiring to the injector; Malfunction of the injector itself; Problems with the engine control unit.
How do I fix a P21F3 diagnostic trouble code?
To fix P21F3: Check the integrity of the wiring harness to the injector. Measure the injector resistance. Check the voltage in the injector control circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21F3?
Yes, but get it checked soon
How much does it cost to fix P21F3?
The estimated repair cost for P21F3 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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