Smart P2403.40h Guide

Tell me your and engine type (Gas vs. Diesel). Share if you see three bars or a standard engine light .

: This is a sub-code used by Mercedes-Benz/Smart internal systems (like STAR/Xentry). It often denotes a functional failure or a "signal defect".

: Reduced power to prevent further mechanical damage. smart p2403.40h

: A faulty leak detection pump or a break in the wiring to the sensor.

: Inspect the electrical connectors on the transmission actuator for corrosion or loose pins. Re-teaching or "learning" the transmission via a STAR diagnostic tool often resolves software-based blockages. 2. EVAP System Failure If the car is a gasoline model where the code is literal: Tell me your and engine type (Gas vs

Mention any made to the battery or transmission.

: Frayed wires near the gearbox or a failing Ground (GND) connection . : This is a sub-code used by Mercedes-Benz/Smart

Automotive diagnostics use complex strings to pinpoint exact failures. Here is what this specific sequence usually means for a Smart owner: