Code 57-43 P1 Sensor Lockout or 58-43 P2 Sensor Lockout - Pressure transducer sending incorrect value.

What does 57-43 / 58-43 mean?

This code signifies that pressure transducer P1 (57-43) or P2 (58-43) is sending an incorrect DC voltage value (specifically 4.84-4.95V DC) to the PCM, indicating a likely failure of the transducer part itself. The system will enter a lockout state.

• Failed pressure transducer part (P1 or P2).
• Faulty wiring to the transducer (less common if specific voltage range is reported).

Click steps to track your progress.

1. 1

   To confirm the faulty transducer, try switching the harnesses between the P1 and P2 transducer connections on the PCM.

2. 2

   If the fault code follows the transducer (e.g., 57-43 becomes 58-43 after switching), then that specific pressure transducer is likely faulty.

3. 3

   Carefully trace the wires from the PCM board connection to ensure you are replacing the correct pressure transducer.

4. 4

   Contact a qualified technician to replace the failed pressure transducer.