C1440

What does C1440 mean?

C-code C1440 means "Pressure Transducer Main / Primary signal Faulted". It is a manufacturer-specific diagnostic trouble code (DTC) in the chassis / braking. The pressure reading from the pressure transducer main / primary signal faulted is outside the expected operating range. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.

Possible Causes

• Faulty pressure sensor or damaged sensor connector
• Fluid leak causing lower-than-expected pressure readings
• Blocked pressure port or contaminated sensing element
• Pump or actuator failure affecting system pressure

Recommended Actions

1. 1 Note the alert and schedule a diagnostic appointment when convenient
2. 2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside C1440
3. 3 Inspect the chassis / braking component and its wiring for visible damage
4. 4 Check for water intrusion in connector areas and clean contacts if corroded
5. 5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
6. 6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement

Related Chassis fault codes