Pinpoint Test Ad: DTC U0126

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

AD1 REPEAT THE HCM SELF-TEST
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: HCM Self-Test.
- Clear the DTCs and repeat the HCM self-test.
- Is DTC U0126 retrieved again?
- Yes: GO to AD2 .
- No: The vehicle is operating correctly at this time. The HCM may have temporarily lost communication with the SASM .
AD2 CHECK THE ABS MODULE FOR DTC U0126
- Enter the following diagnostic mode on the scan tool: ABS Module Self-Test.
- Carry out the self-test for the ABS module.
- Is DTC U0126 retrieved?
- Yes: REFER to MODULE COMMUNICATIONS NETWORK .
- No: GO to AD3 .
AD3 CHECK FOR CORRECT HCM OPERATION
- Disconnect the HCM connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the HCM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new HCM . REFER to HEADLAMP CONTROL MODULE (HCM) . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.