Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2019 Lincoln MKT BaseFACTORY OEM SERVICE PROCEDURE
HCM (Headlamp Control Module
| DTC | Description | Action |
|---|---|---|
| B103C:11 | Left Headlamp Control: Circuit Short To Ground | GO to Pinpoint Test J . |
| B103C:15 | Left Headlamp Control: Circuit Short To Battery or Open | GO to Pinpoint Test J . |
| B103C:49 | Left Headlamp Control: Internal Electronic Failure | DIAGNOSE all other DTCs first. If no other DTCs are present, INSTALL a new Headlamp Control Module (HCM). REFER to Headlamp Control Module (HCM) . |
| B103C:98 | Left Headlamp Control: Component or System Over Temperature | INSTALL a new LH headlamp assembly. REFER to Headlamp Assembly . |
| B103D:11 | Right Headlamp Control: Circuit Short To Ground | GO to Pinpoint Test K . |
| B103D:15 | Right Headlamp Control: Circuit Short To Battery or Open | GO to Pinpoint Test K . |
| B103D:49 | Right Headlamp Control: Internal Electronic Failure | DIAGNOSE all other DTCs first. If no other DTCs are present, INSTALL a new HCM. REFER to Headlamp Control Module (HCM) . |
| B103D:98 | Right Headlamp Control: Component or System Over Temperature | INSTALL a new RH headlamp assembly. REFER to Headlamp Assembly . |
| U0100:00 | Lost Communication With ECM /PCM "A": No Sub Type Information | GO to Pinpoint Test G . |
| U0121:00 | Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information | GO to Pinpoint Test H . |
| U0140:00 | Lost Communication With Body Control Module: No Sub Type Information | GO to Pinpoint Test I . |
| U0401:00 | Invalid Data Received from ECM /PCM A: No Sub Type Information | DTC U0401:00 is set when a module receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. REFER to Multifunction Electronic Modules . |
| U0415:00 | Invalid Data Received from Anti-Lock Brake System (ABS) Control Module: No Sub Type Information | DTC U0415:00 is set when a module receives invalid network data from another module with a faulted input. RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. REFER to Multifunction Electronic Modules . |
| U2100:00 | Initial Configuration Not Complete: No Sub Type Information | PROGRAM the HCM. REFER to Programmable Module Installation (PMI) in Module Configuration . REPEAT the HCM self-test. If the DTC is returns, INSTALL a new HCM. REFER to Headlamp Control Module (HCM) . |
| U3000:41 | Control Module: General Checksum Failure | INSTALL a new HCM. REFER to Headlamp Control Module (HCM) . |
Factory Service Tools
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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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