P21EC
Cylinder 9 Injector B Circuit Low
P21EC is an OBD-II diagnostic trouble code meaning: Cylinder 9 Injector B Circuit Low. Common causes: damage to the injector circuit wiring, cylinder 9 injector malfunction. Estimated repair cost: $28–94.
Symptoms
- Rough engine operation
- Increased fuel consumption
- Reduced engine power
- Engine stalls at idle
Causes
- Damage to the injector circuit wiring
- Cylinder 9 injector malfunction
- Problems with the engine control unit
- Short circuit in the circuit
How to Fix
- Check the condition of the wiring and connectors of the injector
- Check injector resistance
- Check the control signal from the engine control unit
- Replace the injector if necessary
Related codes
Error P21EC by Vehicle Brand
FAQ
What does the P21EC code mean?
P21EC is an OBD-II diagnostic trouble code that indicates: Cylinder 9 Injector B Circuit Low
What causes a P21EC error code?
The most common causes of P21EC include: Damage to the injector circuit wiring; Cylinder 9 injector malfunction; Problems with the engine control unit; Short circuit in the circuit.
How do I fix a P21EC diagnostic trouble code?
To fix P21EC: Check the condition of the wiring and connectors of the injector. Check injector resistance. Check the control signal from the engine control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21EC?
Do not drive — repair immediately
How much does it cost to fix P21EC?
The estimated repair cost for P21EC is $28–94. Actual cost depends on your vehicle, location, and labor rates.
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