P1305

What does P1305 mean?

P-code P1305 means "Boost Calibration Fault". It is a manufacturer-specific diagnostic trouble code (DTC) in the powertrain. A calibration or relearn procedure is required for the boost calibration fault before normal operation can resume. 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

• Component replacement without performing the required calibration procedure
• Battery disconnect or power interruption cleared calibration data
• Software update changed calibration parameters
• Mechanical adjustment required after part replacement or repair

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 P1305
3. 3 Perform the required calibration or relearn procedure using a compatible scan tool
4. 4 Follow the manufacturer's specific calibration sequence for this component
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

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