2018 Ford Fiesta SE, 4D Hatchback, Standard TransFACTORY OEM SERVICE PROCEDURE

Possible Causes

  • Network communication concern
  • TCM
  • ABS module
  1. Q1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
    • Retrieve the continuous memory DTCs.
    • Does the TCM pass the Network Test? 
      Yes No
      Go to  Q2. DIAGNOSE the scan tool does not communicate with the TCM. Refer to Module Communications Network article.
  2. Q2: CHECK THE ABS MODULE DTCS 
    • Carry out the ABS self-test.
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Is DTC U0100:xx or U0402:xx retrieved again? 
      Yes No
      Go to  Q3. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  3. Q3: CHECK FOR ABS MODULE DTC U3003:16 AND U3003:17 
    • Review the results 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  Q4.
  4. Q4: CHECK FOR DTCS IN THE TCM 
    • Carry out the TCM self-test.
    • Are any DTCs present? 
      Yes No
      DIAGNOSE the TCM DTC. REFER to Automatic Transmission article. Go to  Q5.
  5. Q5: CHECK FOR DTC U0101:XX, U0402:XX SET IN OTHER MODULES 
    • Retrieve the continuous memory DTCs.
    • Is DTC U0100:xx or U0402:xx set in any module in addition to the ABS module? 
      Yes No
      CHECK OASIS for any applicable Technical Service Bulletins TSBs.
      If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.
      If no TSBs address this concern, INSTALL a new TCM.
      REFER to Automatic Transmission article      		 INSTALL a new ABS module.
      CHECK OASIS for any applicable Technical Service Bulletins TSBs.
      If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.
      If no TSBs address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) and Stability Control article
      ORDER a replacement ABS module and INCLUDE the RVC on the form.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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