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TuningBot DTC Database · v4.37.14

U0100 Diagnostic Trouble Code (2 variants)

Generic (OBD-II) interpretation + 1 manufacturer-specific in the TuningBot DTC database.

U · NetworkNetworkOBD2
Brand pages:Ford

Generic (OBD-II) interpretation

U0100
Lost Communication With engine control module (ECM) A Generic · network Data confidence 65%

The control module stopped receiving expected network messages from the engine control module (ECM) A node on the vehicle communication bus.

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Manufacturer-specific interpretations

Ford

3 interpretations
U0100:00
Lost Communication With ECM/PCM "A" — No Sub Type Information Ford · network Data confidence 96%

The Ford Explorer PSCM detected lost communication with ecm/pcm "a" with failure type 00, no sub type information. This interpretation is specific to the documented EPAS controller and model years.

Recommended checks

  • Perform a full module scan
  • Verify battery voltage and PSCM power supplies
  • Inspect EPAS wiring and connectors
  • Review PSCM snapshot and extended data
  • Follow the Ford EPAS diagnostic procedure
Applies to Ford Explorer 2011-2012 Power Steering Control Module (PSCM)|Electric Power Assisted Steering (EPAS)
U0100:87
Lost Communication With ECM/PCM A — Missing Message Ford · network Low Data confidence 98%

During the documented diagnostic self-test, the telematics control unit did not receive a valid PCM message over CAN. Under the bulletin criteria, this stored DTC does not indicate a driveability fault.

Possible causes

Diagnostic self-test message timing condition

Recommended checks

  • Perform a full PCM and telematics-control-unit scan
  • Confirm that no other PCM or TCU DTC is present
  • Confirm that the MIL is off with the engine running
  • Confirm that no driveability concern is present
  • Apply Ford SSM 51488 criteria
Applies to Ford F-Super Duty 2023 Telematics Control Unit (TCU)
U0100:87
Lost Communication With ECM/PCM A — Missing Message Ford · network Low Data confidence 97%

Ford SSM 51578 documents U0100:87 as a BCM self-test history DTC on the 2023 F-Super Duty. When all bulletin criteria are met, it reflects the self-test sequence rather than a confirmed module failure.

Possible causes

Incorrect internal measurement sequence during diagnostic self-test

Recommended checks

  • Perform a full BCM scan
  • Confirm that no other BCM DTC is present
  • Confirm that the MIL is off with the engine running
  • Confirm that no driveability concern is present
  • Apply Ford SSM 51578 criteria
Applies to Ford F-Super Duty P708 2023 Body Control Module (BCM)

Related and nearby codes

U01 range
U0101U0102U0103U0104U0105U0106U0107U0108U0109U010AU010BU010CU010DU010EU010FU0110U0111U0112

How to read U0100

U

Network: communication between control units.

0

Generic SAE-standard code: same meaning on every make.

100

Specific fault index within the subsystem.

Frequently asked questions about U0100

What does U0100 mean?

Diagnostic Trouble Code (2 variants). The control module stopped receiving expected network messages from the engine control module (ECM) A node on the vehicle communication bus.

Is U0100 generic or manufacturer-specific?

U0100 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.

Can TuningBot remove U0100 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0100 is removable in your case.

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