P21D4
Cylinder 6 Injector B Circuit/Open
P21D4 is an OBD-II diagnostic trouble code meaning: Cylinder 6 Injector B Circuit/Open. Common causes: cylinder 6 injector malfunction, broken or damaged injector wires. Estimated repair cost: $28–89.
Symptoms
- Unstable engine operation
- Misfire in cylinder 6
- Power Loss
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Cylinder 6 injector malfunction
- Broken or damaged injector wires
- Poor contact in the injector connector
- Control module malfunction
- Short circuit in the circuit
How to Fix
- Check injector resistance
- Inspect wiring and connectors for damage
- Check the presence of a control signal from the ECU
- Replace the injector if necessary
- Clear contacts and restore connections
Related codes
Error P21D4 by Vehicle Brand
FAQ
What does the P21D4 code mean?
P21D4 is an OBD-II diagnostic trouble code that indicates: Cylinder 6 Injector B Circuit/Open
What causes a P21D4 error code?
The most common causes of P21D4 include: Cylinder 6 injector malfunction; Broken or damaged injector wires; Poor contact in the injector connector; Control module malfunction.
How do I fix a P21D4 diagnostic trouble code?
To fix P21D4: Check injector resistance. Inspect wiring and connectors for damage. Check the presence of a control signal from the ECU. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21D4?
Limited driving only, diagnose soon
How much does it cost to fix P21D4?
The estimated repair cost for P21D4 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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