P20EA

Reductant Control Module Power Relay De-Energized Performance - Too Early

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Reducing engine power (limp home mode)
Increased emissions of nitrogen oxides (NOx)
SCR system error message on dashboard
Problems with passing technical inspection

Causes

Faulty reagent module power relay
Problems in the relay power circuit (open, short circuit)
Corrosion of relay contacts or connectors
SCR control module software errors
Damage to the wiring harness to the reagent module

How to Fix

Check the condition of the power relay and its contacts
Test the relay power circuit for open circuit and short circuit.
Update SCR module software
Replace the faulty relay if necessary
Check the integrity of the wiring harness to the reagent module

Related codes

P20EE P20E9 P20EB