P20D6

Exhaust Aftertreatment Fuel Injector B Stuck Closed

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Increase in harmful emissions
Check Engine light comes on
Reduced efficiency of the exhaust gas cleaning system
Problems with diesel particulate filter regeneration
Possible errors related to the exhaust gas cleaning system

Causes

Dirty or clogged nozzle
Mechanical damage to the injector
Problems with the injector electrical circuit
Engine control unit malfunction
Low fuel quality

How to Fix

Check the electrical circuit of the injector for opens and shorts
Check injector resistance
Clean or replace fuel injector B
Check the operation of the engine control unit
Use quality fuel

Related codes

P20D5 P20D7 P20D8