P1748: EPC Malfunction

What does P1748 mean?

P1748 is a diagnostic trouble code indicating "EPC Malfunction". A component in the engine/powertrain has been flagged as malfunctioning by the vehicle's ECU. This requires diagnosis to determine whether the part itself has failed or if there is a related wiring or control issue.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Noticeable change in engine performance
• Unusual sounds or vibrations
• Possible issues with engine/powertrain operation
• Vehicle may enter reduced power mode (limp mode)

Common causes

• Faulty engine/powertrain component
• Wiring or connector issue in the related circuit
• Failed sensor providing incorrect readings
• Software/calibration issue requiring ECU update
• Related component causing secondary fault

What should you do?

This is a significant issue that should be diagnosed and repaired soon. Avoid long trips or heavy driving until the problem is resolved. Continued driving may cause additional damage.