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.
Headlamp Control Module (HCM) DTC Table
2010 Mercury Mariner Hybrid, AWDSECTION Headlamp Control Module (HCM) DTC Table
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.
NOTE:
This module utilizes a 5-character DTC followed by a 2-character failure-type code. The failure-type code provides information about specific fault conditions such as opens, or shorts to ground. Continuous memory DTCs have an additional 2-character DTC status code suffix to assist in determining DTC history.
HEADLAMP CONTROL MODULE (HCM) DTC TABLE
| DTC | Description | Action |
|---|---|---|
| B1A98:88 | LIN Bus Circuit #1: Bus off | Go To PINPOINT TEST AA . |
| B1D64:01 | Left Headlamp Swivelling Motor: General Electrical Failure | INSTALL a new LH headlamp assembly. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test. |
| B1D64:87 | Left Headlamp Swivelling Motor: Missing Message | Go To PINPOINT TEST AB . |
| B1D65:01 | Right Headlamp Swivelling Motor: General Electrical Failure | INSTALL a new RH headlamp assembly. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test. |
| B1D65:87 | Right Headlamp Swivelling Motor: Missing Message | Go To PINPOINT TEST AB . |
| U0001:88 | High Speed CAN Communication Bus: Bus off | REFER to MODULE COMMUNICATIONS NETWORK . |
| U0100:87 | Lost Communication With ECM/PCM "A": Missing Message | Go To PINPOINT TEST AC . |
| U0101:87 | Lost Communication With TCM: Missing Message | Go To PINPOINT TEST AD . |
| U0121:87 | Lost Communication With Anti-Lock Brake System (ABS) Control Module: Missing Message | Go To PINPOINT TEST AE . |
| U0126:87 | Lost Communication With Steering Angle Sensor Module: Missing Message | Go To PINPOINT TEST AF . |
| U0155:87 | Lost Communication with Instrument Panel Cluster (IPC) Control Module: Missing Message | Go To PINPOINT TEST AG . |
| U0401:86 | Invalid Data Received From ECM/PCM A: Signal Invalid | DTC U0401:86 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 PCM and other modules on the network. REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U0402:86 | Invalid Data Received from TCM: Signal Invalid | DTC U0401:86 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 TCM and other modules on the network. REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U0415:86 | Invalid Data Received From Anti-Lock Brake System (ABS) Control Module: Signal Invalid | DTC U0401:86 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 ABS module and other modules on the network. REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U0423:86 | Invalid Data Received From Instrument Panel Control Module: Signal Invalid | DTC U0401:86 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 Instrument Panel Cluster (IPC) and other modules on the network. REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U0428:86 | Invalid Data Received From Steering Angle Sensor Module: Signal Invalid | DTC U0401:86 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 Power Steering Control Module (PSCM) and other modules on the network. REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U3000:04 | Control Module: System Internal Failure | INSTALL a new Headlamp Control Module (HCM). REFER to Removal and Installation . |
| U3000:46 | Control Module: Calibration/Parameter Memory Failure | INSTALL a new Headlamp Control Module (HCM). REFER to Removal and Installation . |
| U3003:16 | Battery Voltage: Circuit Voltage Below Threshold | Go To PINPOINT TEST AH . |
| U3003:17 | Battery Voltage: Circuit Voltage Above Threshold | Go To PINPOINT TEST AI . |
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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.