P21CF
Cylinder 1 Injector B Circuit/Open
P21CF is an OBD-II diagnostic trouble code meaning: Cylinder 1 Injector B Circuit/Open. Common causes: open or short circuit in the injector circuit, poor contact in the injector connector. Estimated repair cost: $17–89.
Symptoms
- Unstable engine idling
- Misfire in cylinder 1
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Open or short circuit in the injector circuit
- Poor contact in the injector connector
- Malfunction of the injector itself
- Problems with the engine control unit
- Wiring harness damage
How to Fix
- Check the integrity of the wires to the injector of cylinder 1
- Inspect the injector connectors for oxidation or damage.
- Check injector resistance (compare with other cylinders)
- If necessary, replace the injector
- Check the power supply and control signal from the ECU
Related codes
Error P21CF by Vehicle Brand
FAQ
What does the P21CF code mean?
P21CF is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Injector B Circuit/Open
What causes a P21CF error code?
The most common causes of P21CF include: Open or short circuit in the injector circuit; Poor contact in the injector connector; Malfunction of the injector itself; Problems with the engine control unit.
How do I fix a P21CF diagnostic trouble code?
To fix P21CF: Check the integrity of the wires to the injector of cylinder 1. Inspect the injector connectors for oxidation or damage.. Check injector resistance (compare with other cylinders). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21CF?
Limited driving only, diagnose soon
How much does it cost to fix P21CF?
The estimated repair cost for P21CF is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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