Pinpoint Test Ad: DTC U0100:00

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

AD1 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0100 or DTC U0100:00 set in any modules?
- Yes : GO to AD2.
- No : The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
AD2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
  - APIM
  - PCM
  - Instrument Panel Cluster (IPC)
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
- Yes : For the APIM , REFER to DTC TABLES .
  For all other modules, REFER to the master list in MULTIFUNCTION ELECTRONIC MODULES .
- No : GO to AD3.
AD3 CHECK FOR DTC U0100 OR DTC U0100:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0100 or DTC U0100:00 set in more than one module?
- Yes : GO to AD4.
- No : If there is an observable symptom, GO to SYMPTOM TABLE - GENERAL AUDIO SYSTEM to diagnose the observed symptom.
  If there is no observable symptom, CHECK the wiring between the APIM and the PCM for an intermittent fault.
AD4 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Is the concern still present?
- Yes : INSTALL a new PCM. Refer to the appropriate Electronic Engine Controls article for the procedure.. CLEAR all continuous DTCs. REPEAT the APIM self-test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the APIM self-test.