U01B9
Lost Communication With Switch Input Module C
U01B9 is an OBD-II diagnostic trouble code meaning: Lost Communication With Switch Input Module C. Common causes: open or short circuit in the communication circuit, switch input module c faulty. Estimated repair cost: $33–167.
Symptoms
- Incorrect operation of switches in the cabin
- Lack of response to pressing some switches
- The indicator light on the dashboard comes on
- Loss of some comfort features
- Errors in the operation of vehicle electronic systems
Causes
- Open or short circuit in the communication circuit
- Switch input module C faulty
- Connector problems or contact corrosion
- ECU malfunction
- Module power problems
How to Fix
- Check the integrity of the communication circuit between the ECU and the module
- Inspect and clean connector contacts
- Check the power supply and ground of the module
- Test or replace switch input module C
- Check and, if necessary, update the ECU software
Related codes
Error U01B9 by Vehicle Brand
FAQ
What does the U01B9 code mean?
U01B9 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Switch Input Module C
What causes a U01B9 error code?
The most common causes of U01B9 include: Open or short circuit in the communication circuit; Switch input module C faulty; Connector problems or contact corrosion; ECU malfunction.
How do I fix a U01B9 diagnostic trouble code?
To fix U01B9: Check the integrity of the communication circuit between the ECU and the module. Inspect and clean connector contacts. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U01B9?
Yes, but get it checked soon
How much does it cost to fix U01B9?
The estimated repair cost for U01B9 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat