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OBD-II code · manufacturer-specific

B1850

Climate Control Temperature Differential Circuit Open

System
B — Body electronics
Severity
Low (1/5)
Can I keep driving?
Usually safe to drive
01

What does B1850 mean?

B1850 is defined as “Climate Control Temperature Differential Circuit Open”.

You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.

02

Manufacturer-specific meanings

The same code can mean something different on some makes.

  • Mercedes: Electric seat adjustment front right: CAN communication interrupted with DCM
03

Related codes

04

Look up another code

This page is general information; an exact diagnosis needs measurements and a technician’s check.