P21DB

Cylinder 1 Injector B Circuit Low

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
Check Engine Light Illuminates
Reduced engine power

Causes

Malfunction of injector B of cylinder 1
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 injector B of cylinder 1
Inspect the injector control circuit for damage.
Check the contacts in the injector connector
Scan the engine control module for additional errors
If necessary, replace the injector or repair the wiring

Related codes

P21DA P21DC P21DD