LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2021 >> Escape SE Plug-In Hybrid >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Abs Guided Routine - Pinpoint Tests C - F >> Pinpoint Tests D: Lost Communication With BCM (Body Control Module) >> Possible Causes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Possible Causes

Fig 1: Anti-Lock Brake System-A (ABS-A) Module Connector - C135A
G13726293Courtesy of FORD MOTOR CO.

Harness Side

Fig 2: Anti-Lock Brake System-B (ABS-B) Module Connector - C135B
G13726294Courtesy of FORD MOTOR CO.

Harness Side

Fig 3: Body Control Module-E (BCM-E) Connector - C2280E
G13726295Courtesy of FORD MOTOR CO.

Harness Side

Fig 4: Gateway Module A (GWM) Connector - C2431
G13726296Courtesy of FORD MOTOR CO.

Harness Side

  1. D1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON.
    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle. NOTE: DTC s may bedisplayed from previous diagnostic actions.

    Does the BCM pass the network test? 

    Yes No
    Diagnose all BCM DTC  s. Refer to BODY CONTROL MODULE (BCM)
    If there are no DTCs in the BCM, Go to  D3.    		 Go to  D2.
  2. D2: CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION 
    • Ignition ON.
    • Using a diagnostic scan tool, carry out the network test.
    • Using a diagnostic scan tool, retrieve the DTCs from the vehicle.
      NOTE: DTCs may be displayed from previous diagnostic actions.

    Does the GWM pass the network test? 

    Yes No
    DIAGNOSE all BCM DTC does not communicate with the diagnostic scan tool. REFER to Module Communications Network article. DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to Module Communications Network article.
  3. D3: RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) s 
    • Carry out the ABS  self-test
    • Record all ABS  module DTC  s.
    • Clear the ABS DTC  s.
    • Put the ABS  module in sleep mode by performing the following steps:
      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
    • Ignition ON.
    • Carry out the ABS self-test.

    Are any of the DTCs listed in the Fault Trigger Conditions Table retrieved again? 

    Yes No
    Go to  D4. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  4. D4: CHECK FOR VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE) S IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE 
    • Review the recorded DTC  s from the ABS  module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes No
    For DTC U3003:16, GO to PINPOINT TEST A.
    FOR DTC U3003:17, GO to PINPOINT TEST F.     		 Go to  D5.
  5. D5: RETRIEVE ALL DTC (DIAGNOSTIC TROUBLE CODE) S FROM THE GWM (GATEWAY MODULE A) 
    • Using a diagnostic scan tool, carry out the GWM  self-test.
    • Record all DTC  s from the GWM  self-test.

    Are any DTCs present in the GWM? 

    Yes No
    DIAGNOSE the GWM DTC  . REFER to CONTROLLER AREA NETWORK (CAN) MODULE COMMUNICATIONS NETWORK . Go to  D6.
  6. D6: RETRIEVE ALL DTC (DIAGNOSTIC TROUBLE CODE) S FROM THE BCM (BODY CONTROL MODULE) 
    • Carry out the BCM  self-test.
    • Record all DTC  s from the BCM  self-test.

    Are any DTCs present in the BCM? 

    Yes No
    DIAGNOSE the BCM DTC  . REFER to BODY CONTROL MODULE (BCM) . Go to  D7.
  7. D7: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN 
    NOTE: If new modules were installed prior to the DTC  being set, the module configuration can be incorrectly set during the PMI  or the PMI  may not have been carried out.
    • Check the vehicle service history for recent service actions related to the BCM or the ABS module. If recent service history is found:
      • Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
      • Verify the configuration of replacement module was correct. Re-configure the 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 No
    Go to  D8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. D8: CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S IN OTHER MODULES 
    • Ignition ON.
    • Using a diagnostic scan tool, retrieve the DTC  s from the vehicle.
      NOTE: DTCs may bedisplayed from previous diagnostic actions.

    Is DTC U0140:xx, U0422:xx or U3003:08 set in 1 or more modules in addition to the ABS module? 

    Yes No
    Go to  D9 Go to  D10
  9. D9: CHECK FOR CORRECT BCM (BODY CONTROL MODULE) MODULE OPERATION 
    • Ignition OFF.
    • Put the ABS module in sleep mode by performing the following steps:
      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
    • Disconnect BCM  connectors.
    • Disconnect GWM  connectors.
    • Disconnect ABS  module connector.
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Connect BCM  module connectors. Make sure the connectors seat and latch correctly.
    • Connect GWM  module connectors. Make sure the connectors seat and latch correctly.
    • Connect ABS  module connectors. Make sure the connectors seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new BCM.
    Refer to BODY CONTROL MODULE (BCM) .    		 The system is operating correctly at this time. The concern may have been caused bya loose or corroded connector. ADDRESS the root cause of any connector or pinissues.
  10. D10: CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION 
    • Put the ABS module in sleep mode by performing the following steps:
      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
    • Ignition OFF.
    • ABS Module connector disconnected. C135 .
    • BCM connectors disconnected.
    • GWM connectors disconnected.
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • ABS Module connector C135 . Make sure the connector seats and latches correctly.
    • BCM Module connectors. Make sure the connectors seat and latch correctly.
    • GWM Module connector. Make sure the connectors seat and latch correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes No
    CHECK OASIS for any 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 services articles address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) and Stability Control article.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
scientia non olet · About LEMON Manuals