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 Mustang Mach 1, AutomaticFACTORY OEM SERVICE PROCEDURE
Anti-Theft Systems DTCS
INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Perform Test |
|---|---|---|
| B1202 | Fuel Sender Open Circuit | REFER to INSTRUMENT CLUSTER . |
| B1204 | Fuel Sender Short to Ground | REFER to INSTRUMENT CLUSTER . |
| B1213 | Anti-Theft Number of Programmed Keys is Below Minimum | GO to PINPOINT TEST D . |
| B2103 or B1232 | Antenna Not Connected - Defective Transceiver | GO to PINPOINT TEST E . |
| B1317 | Battery Voltage High | REFER to GENERATORS & REGULATORS . |
| B1318 | Battery Voltage Low | REFER to GENERATORS & REGULATORS . |
| B1342 | ECU Is Defective | REFER to INSTRUMENT CLUSTER . |
| B1356 | Ignition Run Circuit Open | REFER to STEERING COLUMN SWITCHES . |
| B1364 | Ignition Start Circuit Open | REFER to STEERING COLUMN SWITCHES . |
| B1600 | PATS Ignition Key Transponder Signal Is Not Received - Damaged Key or Non-PATS Key | F |
| B1601 | PATS Received Incorrect Key-Code From Ignition Key Transponder (Unprogrammed Encoded Ignition Key) | G |
| B1602 | PATS Received Invalid Format Of Key-Code From Ignition Key Transponder (Partial Key Read) | H |
| B1681 | PATS Transceiver Signal Is Not Received (Not Connected, Damaged, or Wiring) | I |
| B2139 | PCM ID Does Not Match Between Instrument Cluster and PCM | J |
| B2141 | NVM Configuration Failure (No PCM ID Exchange Between Instrument Cluster and PCM) | K |
| B2143 | NVM Memory Failure | REFER to INSTRUMENT CLUSTER . |
| C1284 | Oil Pressure Switch Failure | REFER to INSTRUMENT CLUSTER . |
| U1147 | SCP Invalid or Missing Data for Vehicle Security | C |
| U1262 | Missing SCP Message | REFER to MODULE COMMUNICATIONS NETWORK . |
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.