P21EC

Cylinder 9 Injector B Circuit Low

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$28–94 (est.)

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

P21EB P21ED P0209