P21D9
Cylinder 11 Injector B Circuit/Open
P21D9 is an OBD-II diagnostic trouble code meaning: Cylinder 11 Injector B Circuit/Open. Common causes: broken or damaged injector circuit wires, cylinder 11 injector malfunction. Estimated repair cost: $17–89.
Symptoms
- Misfire in cylinder 11
- Reduced engine power
- Unstable engine idling
- Increased fuel consumption
- Check Engine light comes on
Causes
- Broken or damaged injector circuit wires
- Cylinder 11 injector malfunction
- Problems with the injector connector
- Malfunction of the engine control unit (ECU)
- Blown fuse or faulty relay
How to Fix
- Check the integrity of the injector circuit wires
- Check the condition of the injector connector
- Check injector resistance
- Replace the faulty injector if necessary
- Check and replace fuses or relays
Related codes
Error P21D9 by Vehicle Brand
FAQ
What does the P21D9 code mean?
P21D9 is an OBD-II diagnostic trouble code that indicates: Cylinder 11 Injector B Circuit/Open
What causes a P21D9 error code?
The most common causes of P21D9 include: Broken or damaged injector circuit wires; Cylinder 11 injector malfunction; Problems with the injector connector; Malfunction of the engine control unit (ECU).
How do I fix a P21D9 diagnostic trouble code?
To fix P21D9: Check the integrity of the injector circuit wires. Check the condition of the injector connector. Check injector resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21D9?
Limited driving only, diagnose soon
How much does it cost to fix P21D9?
The estimated repair cost for P21D9 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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