Smart P2403.40h |verified| May 2026

: Reduced power to prevent further mechanical damage.

Tell me your and engine type (Gas vs. Diesel). Share if you see three bars or a standard engine light . smart p2403.40h

: The "Check Engine" light or the infamous three bars appearing in the gear indicator. : Reduced power to prevent further mechanical damage

: A faulty leak detection pump or a break in the wiring to the sensor. smart p2403.40h

: On many Smart diesel or older gasoline models, users report this code alongside transmission "limp mode," where the car may show three horizontal bars on the dash and refuse to shift. Common Symptoms