Code Definition

B212C — Ignition Run/Start Input Circuit Open

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Jeep

About B212C

B212C is a generic (obd-ii standard) 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 B212C is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

Because B212C is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) monitors a hard wired ignition run/start input from the ignition switch to determine the current key position and coordinate ignition state across the vehicle network. DTC B212C is set when the BCM detects an open circuit or absent voltage signal on the ignition run/start input while the BCM otherwise expects the ignition to be in RUN or START. The input is typically a switched battery feed from the ignition switch contacts that pulls the BCM input high when the key is turned, so the fault indicates a loss of continuity between the ignition switch and the BCM. Sym...

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