Nissan Sentra manuals

Nissan Sentra Service Manual: U0140 Lost communication (BCM)

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms [Trouble diagnosis content]

DTC detection condition

Possible causes

U0140 LOST COMM (BCM) [Lost Communication With Body Control Module] When the ignition switch is ON, TCM is unable to receive the CAN communications signal from BCM continuously for 2 seconds or more.
  • BCM
  • Harness or connector (CAN communication line is open or shorted)

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT


  1. Start the engine and wait for at least 5 seconds.
  2. Check the DTC.

Is “U0140” detected? YES >> Go to TM-154, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

For the diagnosis procedure, refer to LAN-16, "Trouble Diagnosis Flow Chart".

U0141 LOST COMMUNICATION (BCM A)

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms [Trouble diagnosis content]

DTC detection condition

Possible causes

U0141 LOST COMM (BCM A) [Lost Communication With Body Control Module A] When the ignition switch is turned ON, TCM continues no reception of the CAN communication signal from IPDM E/R for 2 seconds or more.
  • IPDM E/R
  • Harness or connector (CAN communication line is open or shorted)

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT


  1. Start the engine and wait for at least 5 seconds.
  2. Check the DTC.

Is “U0141” detected? YES >> Go to TM-155, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

For the diagnosis procedure, refer to LAN-16, "Trouble Diagnosis Flow Chart".

DTC/Circuit diagnosis
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Other materials:

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Service equipment
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Symptom diagnosis
CVT CONTROL SYSTEM Symptom Table The diagnosis item number indicates the order of check. Start checking in the order from 1. ...

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