U01B5
Lost Communication With Catalyst Heater Control Module
U01B5 is an OBD-II diagnostic trouble code meaning: Lost Communication With Catalyst Heater Control Module. Common causes: open or short circuit in the heating module circuit, malfunction of the catalyst heating control module. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced catalytic converter efficiency
- Possible problems starting the engine in cold weather
- Increased fuel consumption
- Reduced engine power
Causes
- Open or short circuit in the heating module circuit
- Malfunction of the catalyst heating control module
- Module power problems
- Faulty relay or fuse
- ECU problems (rare)
How to Fix
- Check the integrity of fuses and relays associated with the system
- Check the condition of the wiring harness and module connectors
- Check the power supply and ground of the heating module
- Test the catalyst heating module
- If necessary, replace the heating module
Related codes
Error U01B5 by Vehicle Brand
FAQ
What does the U01B5 code mean?
U01B5 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Catalyst Heater Control Module
What causes a U01B5 error code?
The most common causes of U01B5 include: Open or short circuit in the heating module circuit; Malfunction of the catalyst heating control module; Module power problems; Faulty relay or fuse.
How do I fix a U01B5 diagnostic trouble code?
To fix U01B5: Check the integrity of fuses and relays associated with the system. Check the condition of the wiring harness and module connectors. 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 U01B5?
Yes, but get it checked soon
How much does it cost to fix U01B5?
The estimated repair cost for U01B5 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat