Code Definition

C211B (92) — Ignition Run/Start Input Performance or Incorrect Operation

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

About C211B

C211B is a generic (obd-ii standard) chassis diagnostic trouble code recorded for Jeep vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C211B is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C211B 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 ABS or Electronic Stability Control (ESC) module monitors the ignition run/start input from the BCM or ignition switch over the network to confirm correct system power state and operational readiness during driving and key cycles. DTC C211B is set when the ignition run/start input signal is present but behaves outside of expected parameters, such as an incorrect voltage level, a delayed transition between key positions, or inconsistent state changes compared to other ignition status signals on the network. This indicates a performance or plausibility fault rather than a complete circuit op...

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