U1299
Door Multiplex Control Unit Lost Communication With Climate Control Unit
U1299 is an OBD-II diagnostic trouble code meaning: Door Multiplex Control Unit Lost Communication With Climate Control Unit. Common causes: broken wires in the harness, oxidation of connector contacts. Estimated repair cost: $6–167.
Symptoms
- Climate control does not work
- Error on the instrument panel
- Malfunctions of electric windows
- Incorrect operation of automatic door functions
- Lack of communication between blocks in diagnostics
Causes
- Broken wires in the harness
- Oxidation of connector contacts
- Malfunction of the door control unit
- Problems with the climate control module
- Multiplex bus failure
How to Fix
- Check the integrity of the wiring harness between the modules
- Clean connector contacts
- Check power and ground of modules
- Scan other modules for communication errors
- Replace the faulty control unit if necessary
Related codes
FAQ
What does the U1299 code mean?
U1299 is an OBD-II diagnostic trouble code that indicates: Door Multiplex Control Unit Lost Communication With Climate Control Unit
What causes a U1299 error code?
The most common causes of U1299 include: Broken wires in the harness; Oxidation of connector contacts; Malfunction of the door control unit; Problems with the climate control module.
How do I fix a U1299 diagnostic trouble code?
To fix U1299: Check the integrity of the wiring harness between the modules. Clean connector contacts. Check power and ground of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1299?
Yes, but get it checked soon
How much does it cost to fix U1299?
The estimated repair cost for U1299 is $6–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat