P21DC
Cylinder 1 Injector B Circuit High
P21DC is an OBD-II diagnostic trouble code meaning: Cylinder 1 Injector B Circuit High. Common causes: cylinder 1 injector malfunction, 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
- Difficulty starting the engine
- Power Loss
Causes
- Cylinder 1 injector malfunction
- 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 the injector of cylinder 1
- Inspect the injector wiring and connectors for damage.
- Check the voltage in the injector control circuit
- If necessary, replace the injector
- Update ECU firmware (if required)
Related codes
Error P21DC by Vehicle Brand
FAQ
What does the P21DC code mean?
P21DC is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Injector B Circuit High
What causes a P21DC error code?
The most common causes of P21DC include: Cylinder 1 injector malfunction; Open or short circuit in the injector control circuit; Poor contact in the injector connector; Engine control unit malfunction.
How do I fix a P21DC diagnostic trouble code?
To fix P21DC: Check the resistance of the injector of cylinder 1. Inspect the injector wiring and connectors for damage.. Check the voltage in the injector control circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21DC?
Limited driving only, diagnose soon
How much does it cost to fix P21DC?
The estimated repair cost for P21DC is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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