Intermittent no start, with the engine light and several warnings, caused by the 8G-DCT wake-up line (CLA, GLA and GLB)

Engine / equipment

Mercedes-Benz CLA (118), GLA and GLB (247) with the 8G-DCT dual-clutch gearbox

Period mentioned

Model years 2024 onwards (US)

Symptoms

Now and then the car will not start, with the engine warning light on and several warning messages on the cluster.

Possible cause described

The dual-clutch gearbox control unit stores code P24F100 (wake-up line short to positive); the likely cause is signal timing between the ignition control unit (EZS) and the gearbox control unit. Mercedes-Benz fixes it with new SCN coding of the EZS control unit (note LI27.19-P-080869).

Check for the garage

Ask the garage to read the gearbox fault memory and, if P24F100 appears, to apply note LI27.19-P-080869 (SCN coding of the EZS) before replacing the gearbox control unit or the battery.

Cost cited in the source

No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Sources from the original database