U0100 CHRYSLER Lost Communication With ECM/PCM

U0100 CHRYSLER Lost Communication With ECM/PCM - The primary communication network between electronic control modules is the Controller Area Network (CAN) data bus system. The CAN data bus allows all electronic modules connected to the bus to share information with each other. Regardless of whether a message originates from a module on the higher speed CAN C (500K) bus or on the lower speed bus, CAN interior High Speed (IHS) (125K) bus, the message structure and layout is similiar, which allows the Body Control Module/Central gateway (BCM or BCMCGW) to process and transfer messages between the CAN buses.
An additional gateway module, the Telematics Gateway (TGW) module is used to transfer messages between the CAN IHS Bus and the CAN Audio and Telematics (AT) Bus. The BCM stores DTC for certain bus network faults on the CAN C Bus and CAN IHS Bus. The TGW stores DTCs for certain bus network faults on the CAN AT Bus.

All modules transmit and receive messages over one of these buses. Data exchange between the modules is archived by serial transmission of encoded data messages (a from of transmission in which data bits are sent sequentially, one at a time, over a single line. Each module can both send and receive serial data simultaneously. Each data bit of a CAN Bus message is carried over the bus as a voltage differential between the two bus circuits which, when strung together, from a message. Each module uses arbitration to sort the message priority if two competing messages are attempting to be broadcast at the same time.
Corruption of a single bit within a message will corupt the entire message. Each message contains a cyclic redundancy check(CRC) which specifies the message size exactly. If the message datected conflicts with the CRC the ECU receiving it will determine the message to be an error and consider that communication has not been possible. Diagnosis of this condition using a lab scope may reveal activity that appears to be bus data messages even if no actual communication is possible. Communication problems that effect the whole bus, as a result of opens and terminal push outs are more likely to occur on data busses that operate at a high speed than a data bus that operates at a lower speed.

When a open circuit or terminal push out occurs one or more modules can become isolated from the reminder of the bus. The isolated module will attempt to communicate, but will not be able to receive messages or determine arbitration from other modules. Each time the isolated module attempts to communicate it alters the bus voltage on the intact bus circuit. Without functioning arbitration the isolated module alters the bus voltage while other bus messages are being sent thereby corrupting the messages on the remainder of the bus.

The CAN bus modules are connected in parallel to the two-wire bus using a twisted pair, where the wires are wrapped around each other to provide shielding from unwanted electromagnetic induction, thus preventing interference with the relatively low voltage signals being carried through them. While the CAN bus is operating (Active), one of the bus wires will carry a higher voltage and is referred to as the CAN High or CAN bus (+) wire, while the other bus wire will carry a lower voltage and is referred to as the CAN low or CAN bus (-) wire.

Possible causes code U0100 Lost communication with ECM/PCM

  • (D65) CAN C bus (+) circuit shorted to voltage.
  • (D64) CAN C bus (-) circuit shorted to ground.
  • DTCs related to battery voltage, ignition, or VIN Messages.
  • BCM not configured correctlt.
  • PCM power and ground.
  • Powertrain Control Module (PCM).
  • Module that set this DTC.

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