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.
2003 Ford ThunderbirdFACTORY OEM SERVICE PROCEDURE
Communication System DTCS (U Codes)
DIAGNOSTIC TROUBLE CODE (DTC) CHART
| DTC | Description | Source | Action |
|---|---|---|---|
| U1009 | SCP (J1580) Invalid or Missing Data for Engine RPM | ABS | CARRY OUT the PCM self-test. For any engine related DTC's refer to ENGINE CONTROLS - SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If there are no engine related DTC's, go to PINPOINT TEST K: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1027 | SCP (J1850) Invalid or Missing Data for Engine RPM. | ABS | CARRY OUT the PCM elf test. For any engine related DTC's refer to ENGINE CONTROLS - SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE . If there are no engine related DTC's, go to PINPOINT TEST J: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1041 | SCP (J1850) Invalid or Missing Data for Vehicle Speed | Instrument Cluster | CARRY OUT ANTI-LOCK CONTROL -- TRACTION CONTROL testing. |
| U1059 | Missing or Invalid PRNDL Message | ANS | CARRY OUT the PCM self-test. For any transmission related DTC's refer to Automatic TransmissionDIAGNOSIS AND TESTING . If there are no transmission related codes go to PINPOINT TEST J: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1073 | SCP (J1850) Invalid or Missing Data for Engine Coolant | Instrument Cluster | CARRY OUT the PCM self-test. For any engine coolant temperature (ECT) related DTC's refer to ENGINE CONTROLS - SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If there are no engine related codes go to PINPOINT TEST J: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1123 | SCP (J1850) Invalid or Missing Data for Odometer | Instrument Cluster | Check the PCM Calibration. For any engine related DTC's refer to ENGINE CONTROLS - SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If PCM calibration is correct, go to PINPOINT TEST J: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1147 | SCP (J1850) Invalid or Missing Data for Vehicle Security | Instrument Cluster | Check the PCM Calibration. For any engine coolant temperature (ECT) related DTC's refer to ENGINE CONTROLS - SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If PCM calibration is correct, go to PINPOINT TEST J: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL . |
| U1262 | SCP (J1850) Communication Bus Fault | Instrument Cluster | Refer to MODULE COMMUNICATIONS NETWORK SYSTEM article. |
| U1262 | SCP (J1850) Communication Bus Fault | ABS Module | Refer to MODULE COMMUNICATIONS NETWORK SYSTEM article. |
| U2017 | Driver Side Crash Sensor Communication Fault | RCM | Refer to SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM article. |
| U2018 | Driver Side Crash Sensor Communication Fault | RCM | Refer to SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM article. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.