Pinpoint Test K: U0140:87

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions

The RGTM and the BCM communicate through the CAN. Messages are exchanged between the modules for the purposes of determining what functions are carried out.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
RGTM U0140:87	Lost Communication With Body Control Module: Missing Message	Sets by the RGTM if expected data messages received from the BCM over the CAN are missing.

Possible Sources

Network communication concern
RGTM
BCM

K1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to K2

No	CLEAR the DTC. The system is operating correctly at this time. The DTC may have been set due to high network traffic or intermittent fault condition.

K2 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, carry out the network test.
Does the BCM pass the network test?

Yes GO to K3

No REFER to: Controller Area Network (CAN) Module Communications Network . REFER to: Ethernet Module Communications Network .

K3 CARRY OUT THE BCM (BODY CONTROL MODULE) SELF-TEST
- Using a diagnostic scan tool, carry out the BCM self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs). REFER to: Body Control Module (BCM) .

No GO to K4

K4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RGTM (REAR GATE TRUNK MODULE) SELF-TEST
- Review the results from the RGTM self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes DIAGNOSE all non-network DTCs. REFER to the appropriate RGTM DTC Chart.

No GO to K5

K5 RECHECK THE RGTM (REAR GATE TRUNK MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the RGTM Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, carry out the continuous memory self-test.

Check the RGTM Diagnostic Trouble Codes (DTCs).

Is DTC U0140:87 still present?

Yes

GO to K6

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or intermittent fault condition.

K6 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

Check the vehicle service history for recent service actions related to the BCM. If recent service history is found:
- verify correct replacement module was installed
  - HVBOM may be used to verify correct part number
- verify the configuration of replacement module was correct
  - re-configure module using as-built data if prior configuration is suspect
- verify the module was not obtained from a like vehicle and installed into customer vehicle
  - return the swapped module to source vehicle and obtain new replacement module

Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes

GO to K7

No	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

K7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect all the BCM connectors and make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM, REFER to: Body Control Module (BCM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.