Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The family of B2100 Diagnostic Trouble Codes (DTCs) typically describes ignition performance related faults. These are often caused by a contradiction of switch status information. For example, if an Electronic Control Unit (ECU) receives a bussed message indicating ignition switch position but the state of a hardwired ignition circuit indicates another switch position a B2100 series DTC would likely result.
These DTCs can be caused by a number of conditions including:
- loose connections
- missing or blown fuses
- faulty component
- vehicle no start or long crank time
Verify the proper operation of the starting system and verify that this DTC is active before proceeding with the diagnostic test.