B2100 - FAULT CODE - OBD2

POST UPDATED IN October, 2021

B2100 Code failures by brands

B2100 CHRYSLER, DODGE, JEEP, RAM: IGNITION RUN/START INPUT CIRCUIT PERFORMANCE

Description of DTC code B2100

Internal combustion engines cannot start on their own. For vehicle engines (both diesel and gasoline), an electric motor known as a starter motor is used. The battery provides voltage to this motor once the driver turns the ignition switch or key. This action makes a gear in the starter motor cause the crankshaft to rotate.

A typical starting circuit includes the battery, starter motor, an activation system, ignition switch, starter solenoid or relay, wiring. For automatic transmission applications, a neutral safety switch is also included. The starting system of an automobile has two circuits: one that supplies power to the engine and the other that controls the starter. Although both are independent, they work together.

The Front Control Module monitors the ignition run/start input circuit. In case this controller detects that the CAN bus message and the wired ignition circuit do not match, it will set the B2100 OBD2 diagnostic code.

Symptoms of fault code B2100

  • Check Engine light ON.
  • Difficult or impossible to start the engine.

Causes of OBD2 B2100

The reasons for storing the B2100 OBDII fault code are:

  • Ignition switch wires may be damaged.
  • The ignition switch circuit may be faulty, resulting in a short or open circuit.
  • The ignition switch may be defective.
  • Possibly the Integrated Power Module is deficient.
  • The Front Control Module may be damaged.

Possible solutions of the DTC code B2100

The steps to follow to correct the DTC B2100 OBD2 code are:

  • Consult the TSB (Technical Service Bulletins).
  • Check if no additional DTCs to B2100 are stored. Note that if codes B2104 and B2105 are active, diagnose them first.
  • Inspect the ignition switch wiring for common damage caused by wear or burns. If one of these conditions is found, make repairs.
  • Perform electrical checks on the ignition switch output circuit to verify that it is in good condition. If after these tests you discover an open or short circuit, make the necessary corrections.
  • Check that the Integrated Power Module and the Front End Control Module are in good condition. For these checks follow the manufacturer's recommendations and if deficiencies are detected, make the appropriate adjustments.

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