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.
2005 Mercury Montego Base, FWDFACTORY OEM SERVICE PROCEDURE
Module Communications Network DTCS
MODULE COMMUNICATIONS NETWORK DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| U0001 | High Speed Communication Bus | DEM | GO to PINPOINT TEST M . |
| U0002 | High Speed Communication Bus Performance | Instrument Cluster | GO to PINPOINT TEST M . |
| U0020 | Low Speed Communication Bus Performance | Instrument Cluster | GO to PINPOINT TEST N . |
| U0073 | High Speed Communication Bus | Transmission Control Module (TCM) | GO to PINPOINT TEST M . |
| U1900 | CAN Communication Bus Fault | ABS Module | GO to PINPOINT TEST M . |
| U1900 | CAN Communication Bus Fault | Audio Unit | GO to PINPOINT TEST N . |
| U1900 | CAN Communication Bus Fault | DSM | GO to PINPOINT TEST N . |
| U1900 | CAN Communication Bus Fault | RCM | GO to PINPOINT TEST M . |
| U1900 | CAN Communication Bus Fault | SJB | GO to PINPOINT TEST N . |
| U1900 | CAN Communication Bus Fault - Receive Error (high speed CAN) | Instrument Cluster | GO to PINPOINT TEST M . |
| U1901 | CAN Network #2 Communication BUS Fault - Receive Error (medium speed CAN) | Instrument Cluster | GO to PINPOINT TEST N . |
Factory Service Tools
Use the Manual With the Right Hardware
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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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