Pinpoint Test E: U0137:87
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.
- Refer to MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Module Controlled Functions - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCM U0137:87 Lost Communication With Trailer Brake Control Module: Missing Message A continuous memory DTC that sets in the BCM if messages from the TBM through the GWM are missing. Possible Sources
- Communication network concern
- Battery voltage concern
- GWM concern
- TBM
- BCM
- E1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Connect the diagnostic tool.
- Using a diagnostic scan tool, perform a network test.
Does the TBM pass the network test?
Yes GO to E2 No REFER to: Module Controlled Functions - System Operation and Component Description . - E2 CHECK THE BCM (BODY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCM CMDTCs.
Is DTC B11D9:16, B11D9:17, U3006:16, U3006:17, U3007:16, U3007:17, U3013:16, U3013:17, U3014:16 or U3014:17 recorded?
Yes For DTC B11D9:16, U3006:16, U3007:16, U3013:16 or U3014:16, GO to Pinpoint Test Y For DTC B11D9:17, U3006:17, U3007:17, U3013:17 or U3014:17, GO to Pinpoint Test Z No GO to E3 - E3 RETRIEVE THE TBM (TRAILER BRAKE CONTROL MODULE) DTCS
- Using a diagnostic scan tool, perform the TBM self-test.
Are any TBM DTCs recorded?
Yes REFER to: Auxiliary Brake System . No GO to E4 - E4 RECHECK THE BCM (BODY CONTROL MODULE) CMDTCS
- Using a diagnostic scan tool, clear the DTCs.
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCM CMDTCs.
Is DTC U0137:87 still present?
Yes GO to E5 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - E5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0137:87 SET IN OTHER MODULES
- Using a diagnostic scan tool, clear the DTCs.
- Ignition OFF.
- Wait 10 seconds.
- Ignition ON.
- Using a diagnostic scan tool, retrieve all CMDTCs.
Is DTC U0137:87 set in other modules?
Yes GO to E6 No GO to E7 - E6 CHECK FOR CORRECT TBM (TRAILER BRAKE CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect the TBM connector.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the TBM connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new TBM. 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. - E7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect the BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. 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 service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles 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.