P21DC

Cylinder 1 Injector B Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Increased fuel consumption
Misfire in cylinder 1
Difficulty starting the engine
Power Loss

Causes

Cylinder 1 injector malfunction
Open or short circuit in the injector control circuit
Poor contact in the injector connector
Engine control unit malfunction
Wiring harness damage

How to Fix

Check the resistance of the injector of cylinder 1
Inspect the injector wiring and connectors for damage.
Check the voltage in the injector control circuit
If necessary, replace the injector
Update ECU firmware (if required)

Related codes

P21DD P0201 P0261