U02A5

Lost Communication With Reductant Heater Control Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
SCR system error message on dashboard
Increased emissions
Problems starting in cold weather

Causes

Open or short circuit in the heating module circuit
Malfunction of the reagent heating control module
Problems with the CAN bus
Faulty relay or fuse
Poor contact in connectors

How to Fix

Check fuses and relays associated with the system
Inspect the wiring harness and connectors for damage.
Check the power supply and ground of the heating module
Diagnose the CAN bus for communication errors
If necessary, replace the heating control module

Related codes

U02A4 U02A6 P20EE