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.
2004 Mercury MontereyFACTORY OEM SERVICE PROCEDURE
Communication System DTCS (U Codes)
COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE CHART
| DTC | Description | Source | Action |
|---|---|---|---|
| U1016 | SCP Invalid Data Node 10 Fault | SJB | Go To PINPOINT TEST A: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1027 | SCP (J1850) Invalid or Missing Data for Engine RPM | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1027 | Missing or Invalid Throttle Message | Speed Control Actuator | Refer to SPEED CONTROL . |
| U1040 | SCP Invalid Data Node 28 Fault | SJB | Go To PINPOINT TEST A: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1041 | Missing or Invalid Speed Message | Speed Control Actuator | Refer to SPEED CONTROL . |
| U1041 | SCP (J1850) Invalid or Missing Data for Vehicle Speed | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1041 | SCP (J1850) Invalid or Missing Data for Vehicle Speed | SJB | Refer to ANTI-LOCK CONTROL . |
| U1042 | SCP (J1850) Invalid or Missing Data for Traction Control | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1043 | SCP (J1850) Invalid or Missing Data for Traction Control | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1050 | SCP (J1850) Invalid or Missing Data for Brakes | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1051 | SCP (J1850) Invalid or Missing Data for Brakes | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1051 | SCP (J1850) Invalid or Missing Data for Brakes | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1051 | Missing or Invalid Brake Message | Speed Control Actuator | Refer to SPEED CONTROL . |
| U1059 | SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1059 | SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1059 | SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL | SJB | Refer to AUTOMATIC TRANSAXLE/TRANSMISSION . . |
| U1059 | Missing or Invalid PRNDL Message | Speed Control Actuator | Refer to SPEED CONTROL . |
| U1073 | SCP (J1850) Invalid or Missing Data for Engine Coolant | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1073 | SCP (J1850) Invalid or Missing Data for Engine Coolant | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1075 | SCP (J1850) Invalid or Missing Data for Engine Oil | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1123 | SCP (J1850) Invalid or Missing Data for Odometer | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1130 | SCP (J1850) Invalid or Missing Data for Fuel System | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1135 | SCP (J1850) Invalid or Missing Data for Ignition Switch/Starter | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1136 | SCP (J1850) Invalid or Missing Data for Telltales | Instrument Cluster | Refer to INFORMATION, GAUGES & WARNING DEVICES . |
| U1147 | SCP (J1850) Invalid or Missing Data for Vehicle Security | SJB | Refer to ANTI-THEFT . |
| U1218 | SCP (J1850) Invalid or Missing Data for External Lamps | SJB | Refer to EXTERIOR LIGHTING . |
| U1222 | SCP (J1850) Invalid or Missing Data for Interior Lamps | Instrument Cluster | Refer to INTERIOR LIGHTING . . |
| U1243 | SCP (J1850) Invalid or Missing Data for Exterior Environment | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1249 | SCP (J1850) Invalid or Missing Data for Time/Date | ABS Module | Refer to ANTI-LOCK CONTROL . |
| U1262 | SCP Communication Bus Fault | Instrument Cluster | Go To PINPOINT TEST O: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION . |
| U1262 | SCP Communication Bus Fault | ABS Module | Go To PINPOINT TEST O: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION . |
| U1262 | SCP (J1850) Communication Bus Fault | SJB | Go To PINPOINT TEST O: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION . |
| U1950 | UBP Communication Bus Fault | DSM | Go To PINPOINT TEST M: NO UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) NETWORK COMMUNICATION . |
| U2051 | One or More Calibration Files Missing or Corrupt | Power Liftgate Module | Refer to MODULE CONFIGURATION . |
| U2051 | One or More Calibration Files Missing or Corrupt | SJB | Refer to MODULE CONFIGURATION . |
| U2362 | UBP Invalid Data from Node ID $98 | Climate Control Seat Module | Go To PINPOINT TEST J: THE DRIVER/PASSENGER CLIMATE CONTROLLED SEAT MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
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.