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
Cruise Control System DTCS
CRUISE CONTROL SYSTEM POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTCs | Description | Source | Perform Test |
|---|---|---|---|
| P0500 | Vehicle Speed Error | PCM | REFER to ANTI-LOCK CONTROL . |
| P0579 | Cruise Control Multifunction Input A Circuit Range/Performance | PCM | Go To PINPOINT TEST A . |
| P0581 | Cruise Control Multifunction Circuit High | PCM | Go To PINPOINT TEST A . |
| P0703 | Brake On/Off Failure | PCM | REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE . |
| P1572 | Brake On/Off Failure | PCM | REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE |
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.
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