P21DB
Cylinder 1 Injector B Circuit Low
P21DB is an OBD-II diagnostic trouble code meaning: Cylinder 1 Injector B Circuit Low. Common causes: malfunction of injector b of cylinder 1, open or short circuit in the injector control circuit. Estimated repair cost: $17–89.
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Misfire in cylinder 1
- Check Engine Light Illuminates
- Reduced engine power
Causes
- Malfunction of injector B of cylinder 1
- Open or short circuit in the injector control circuit
- Poor contact in the injector connector
- Engine control unit malfunction
- Wiring harness damage
How to Fix
- Check the resistance of injector B of cylinder 1
- Inspect the injector control circuit for damage.
- Check the contacts in the injector connector
- Scan the engine control module for additional errors
- If necessary, replace the injector or repair the wiring
Related codes
Error P21DB by Vehicle Brand
FAQ
What does the P21DB code mean?
P21DB is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Injector B Circuit Low
What causes a P21DB error code?
The most common causes of P21DB include: Malfunction of injector B of cylinder 1; Open or short circuit in the injector control circuit; Poor contact in the injector connector; Engine control unit malfunction.
How do I fix a P21DB diagnostic trouble code?
To fix P21DB: Check the resistance of injector B of cylinder 1. Inspect the injector control circuit for damage.. Check the contacts in the injector connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21DB?
Limited driving only, diagnose soon
How much does it cost to fix P21DB?
The estimated repair cost for P21DB is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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