U1091
Invalid Or Missing Data For Non-Legislated Diagnostics
U1091 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Non-Legislated Diagnostics. Common causes: problems with the can bus (open or short circuit), malfunction of one of the electronic modules. Estimated repair cost: ~$278.
Symptoms
- Check Engine light comes on
- Problems connecting diagnostic equipment
- Some non-essential vehicle functions do not work
- Intermittent failures in the infotainment system
Causes
- Problems with the CAN bus (open or short circuit)
- Malfunction of one of the electronic modules
- Problems with module software
- Poor contact in CAN bus connectors
- After flashing or replacing the module
How to Fix
- Check the integrity of the CAN bus and the connection of connectors
- Read all error codes to identify the problematic module
- Update module software (if available)
- Check the power and grounding of the problematic module
- If necessary, replace the faulty module
Related codes
FAQ
What does the U1091 code mean?
U1091 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Non-Legislated Diagnostics
What causes a U1091 error code?
The most common causes of U1091 include: Problems with the CAN bus (open or short circuit); Malfunction of one of the electronic modules; Problems with module software; Poor contact in CAN bus connectors.
How do I fix a U1091 diagnostic trouble code?
To fix U1091: Check the integrity of the CAN bus and the connection of connectors. Read all error codes to identify the problematic module. Update module software (if available). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1091?
Yes, but get it checked soon
How much does it cost to fix U1091?
The estimated repair cost for U1091 is ~$278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat