Code Definition

B10B4 — Cabin Heater 1 Control Circuit Low

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

About B10B4

B10B4 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 B10B4 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.

B10B4 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 the relays that supply power to the cabin PTC (positive temperature coefficient) heater elements, which provide supplemental cabin heat on diesel and hybrid applications when engine coolant is too cold to warm the cabin quickly. The TIPM monitors the voltage on the control circuit for Cabin Heater Relay 1 (K132) whenever the HVAC module commands the heater on. DTC B10B4 is set when the TIPM detects that the relay control circuit voltage has fallen below the expected threshold for the defined monitoring period, wh...

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