U02A5
Lost Communication With Reductant Heater Control Module
U02A5 is an OBD-II diagnostic trouble code meaning: Lost Communication With Reductant Heater Control Module. Common causes: open or short circuit in the heating module circuit, malfunction of the reagent heating control module. Estimated repair cost: $56–278.
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
Error U02A5 by Vehicle Brand
FAQ
What does the U02A5 code mean?
U02A5 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Reductant Heater Control Module
What causes a U02A5 error code?
The most common causes of U02A5 include: 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.
How do I fix a U02A5 diagnostic trouble code?
To fix U02A5: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U02A5?
Limited driving only, diagnose soon
How much does it cost to fix U02A5?
The estimated repair cost for U02A5 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat