P21D1
Cylinder 3 Injector B Circuit/Open
P21D1 is an OBD-II diagnostic trouble code meaning: Cylinder 3 Injector B Circuit/Open. Common causes: open or short circuit in the injector circuit, cylinder 3 injector malfunction. Estimated repair cost: $17–67.
Symptoms
- Uneven engine operation
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Is On
- Possible misfire in cylinder 3
Causes
- Open or short circuit in the injector circuit
- Cylinder 3 injector malfunction
- Problems with the injector connector
- Engine control unit malfunction
- Wiring harness damage
How to Fix
- Check the resistance of the injector of cylinder 3
- Inspect wiring and connectors for damage
- Check for voltage at the injector
- Replace the faulty injector if necessary
- Reset the error code and check if it returns
Related codes
Error P21D1 by Vehicle Brand
FAQ
What does the P21D1 code mean?
P21D1 is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Injector B Circuit/Open
What causes a P21D1 error code?
The most common causes of P21D1 include: Open or short circuit in the injector circuit; Cylinder 3 injector malfunction; Problems with the injector connector; Engine control unit malfunction.
How do I fix a P21D1 diagnostic trouble code?
To fix P21D1: Check the resistance of the injector of cylinder 3. Inspect wiring and connectors for damage. Check for voltage at the injector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21D1?
Limited driving only, diagnose soon
How much does it cost to fix P21D1?
The estimated repair cost for P21D1 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
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