P201A

Reductant Injection Valve Circuit Range/Performance Bank 2 Unit 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
SCR system error message on dashboard
Increased NOx emissions

Causes

Reagent injection valve malfunction
Open or short circuit in valve circuit
Problems with the wiring harness or connectors
Malfunction of the engine control unit (ECU)
Valve is dirty or clogged

How to Fix

Check the integrity of the valve circuit and connectors
Check valve resistance (compare with manufacturer's specifications)
Clean or replace the reagent injection valve if necessary
Check the operation of the SCR system using a diagnostic scanner
If necessary, replace the engine control unit

Related codes

P201B P201C P201D