P1C64

What does P1C64 mean?

P-code P1C64 means "Drive Motor Phase A Cable Circuit Open". It is a manufacturer-specific diagnostic trouble code (DTC) in the electric motor / drive system. The circuit is open (broken/disconnected), meaning no electrical continuity exists in the drive motor phase a cable circuit open wiring path. 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

• Broken, frayed, or corroded wiring harness causing an open circuit
• Disconnected or damaged electrical connector at the sensor or module
• Faulty sensor or actuator with an internal open circuit
• Corrosion at connector pins due to moisture or road salt exposure

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 P1C64
3. 3 Inspect wiring harness and connectors for breaks, corrosion, or disconnection in the affected circuit
4. 4 Use a multimeter to test for continuity in the signal wire from sensor to module
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