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.
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HOMESERVICE MANUALSFORD2004FOCUS ZX5, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXCOMMUNICATION SYSTEM DTCS (U CODES)
2004 Ford Focus ZX5, 2.3 Z, Standard
Communication System DTCS (U Codes)
2004 Ford Focus ZX5, 2.3 Z, StandardSECTION Communication System DTCS (U Codes)
COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| U1009 | SCP (J1850) Bus Invalid or Missing Data for Engine Torque | ABS Module | REFER to ANTI-LOCK CONTROL or ANTI-LOCK CONTROL-TRACTION CONTROL . |
| U1027 | Invalid or Missing Data for Engine RPM | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U1027 | SCP (J1850) Bus Invalid or Missing Data for Engine RPM | ABS | REFER to ANTI-LOCK CONTROL or ANTI-LOCK CONTROL-TRACTION CONTROL . |
| U1041 | Invalid or Missing Data for Vehicle Speed | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U1073 | Invalid or Missing Data for Engine Coolant | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U1123 | Invalid or Missing Data for Odometer | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U1262 | Communication Bus Fault | Instrument Cluster | REFER to MODULE COMMUNICATIONS NETWORK . |
| U1900 | CAN Communication Bus Fault | Instrument Cluster | REFER to MODULE COMMUNICATIONS NETWORK . |
| U1901 | CAN Communication Bus Fault | Instrument Cluster | REFER to MODULE COMMUNICATIONS NETWORK . |
| U2027 | Left Side Crash Sensor Communication Fault (Non SCP) | RCM | REFER to AIR BAG RESTRAINT SYSTEMS . |
| U2028 | Right Side Crash Sensor Communication Fault (Non SCP) | RCM | REFER to AIR BAG RESTRAINT SYSTEMS . |
| U2196 | Invalid Data for Engine RPM | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U2197 | Invalid Data for Vehicle Speed | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U2199 | Invalid Data for Engine Coolant | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U2200 | Invalid Data for Odometer | Instrument Cluster | REFER to INSTRUMENT CLUSTER . |
| U2516 | CAN Bus Off | RCM | REFER to MODULE COMMUNICATIONS NETWORK . |
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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.