Code Definition

B10B8 — Cabin Heater 2 Control Circuit Low

System: Body  |  Type: Manufacturer-Specific  |  Make: Jeep

About B10B8

B10B8 is a manufacturer-specific body diagnostic trouble code recorded for Jeep vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B10B8 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B10B8 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Totally Integrated Power Module (TIPM) on Jeep and Chrysler vehicles controls a bank of relays that supply power to the cabin PTC (positive temperature coefficient) heater elements, providing supplemental cabin heat on diesel and plug in hybrid applications during cold starts. Cabin Heater Relay 2 (identified as K232 or K361 depending on platform) drives the second stage of the PTC heater array and engages when the HVAC module requires additional heating capacity beyond what the first stage supplies. DTC B10B8 is set when the TIPM detects that the voltage on the Cabin Heater 2 relay contro...

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