P21D7
Cylinder 9 Injector B Circuit/Open
P21D7 is an OBD-II diagnostic trouble code meaning: Cylinder 9 Injector B Circuit/Open. Common causes: open or short circuit in the injector circuit, cylinder 9 injector malfunction. Estimated repair cost: $17–89.
Symptoms
- Misfire in cylinder 9
- Reduced engine power
- Increased fuel consumption
- Unstable engine idling
- Check Engine Light Illuminates
Causes
- Open or short circuit in the injector circuit
- Cylinder 9 injector malfunction
- Wiring harness damage
- Problems with the engine control unit
- Oxidation of injector connector contacts
How to Fix
- Check the integrity of the injector wiring and connectors
- Test injector resistance
- Check for voltage at the injector connector
- Replace the faulty injector if necessary
- Clean or replace oxidized contacts
Related codes
Error P21D7 by Vehicle Brand
FAQ
What does the P21D7 code mean?
P21D7 is an OBD-II diagnostic trouble code that indicates: Cylinder 9 Injector B Circuit/Open
What causes a P21D7 error code?
The most common causes of P21D7 include: Open or short circuit in the injector circuit; Cylinder 9 injector malfunction; Wiring harness damage; Problems with the engine control unit.
How do I fix a P21D7 diagnostic trouble code?
To fix P21D7: Check the integrity of the injector wiring and connectors. Test injector resistance. Check for voltage at the injector connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21D7?
Do not drive — repair immediately
How much does it cost to fix P21D7?
The estimated repair cost for P21D7 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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