Known faults for the Mercedes-Benz CLA (C118) / GLA (H247) / GLB.

Engine / equipment

Mercedes CLA C118, GLA H247 and GLB (petrol, diesel, plug-in hybrid and AMG)

Period mentioned

2019 onwards

Symptoms

Noises from the 7G-DCT (whine, hum, clunks) and jerks when shifting or pulling away; a clutch that wears faster with short trips or towing.

Possible cause described

The guide recommends a software update for jerky shifts. Recalls: an airbag cover that could come loose in a crash and A/C pipe connections on some cars.

Check for the garage

Ask for the gearbox software update; check the campaigns by VIN.

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

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

Engine / equipment

Mercedes-Benz with a capacitive steering wheel (code 266)

Period mentioned

Built from 2020

Symptoms

Messages on the cluster: "Active Emergency Stop Assist not available", "Active Lane Keeping Assist not available" or "Active steering assist not available".

Possible cause described

The steering wheel hands-on detection fails: the detection mat, its control unit, the contacts or the wiring. Mercedes-Benz releases new software and SCN coding for the HOSWD control unit (note LI46.10-P-078012).

Check for the garage

Ask the garage to apply note LI46.10-P-078012: do not replace the HOSWD control unit, update its software and check the steering wheel contacts, wires and ground connections.

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

Engine / equipment

OM607 and OM608 1.5 diesel of Renault origin (K9K): A 160/180 CDI and d, B 160/180, CLA 180 CDI and d, GLA 180 d, Citan

Period mentioned

2012–2026

Symptoms

Smoke, hesitation or hard starting (injectors); unstable idle, power loss and engine light (EGR); particulate filter warning in town use; oil consumption.

Possible cause described

It is Renault's 1.5 dCi with Mercedes electronics. On the OM607 the injectors are the main weak point; the OM608 that replaced it in 2018 has fewer problems. The EGR builds up carbon, mostly between 60,000 and 100,000 km, and the particulate filter clogs on short trips.

Check for the garage

Identify the engine (OM607 until 2018, OM608 after), measure injector balance rates, check the EGR and particulate filter status and watch the oil level.

Cost cited in the source

Depends on the part (injectors, EGR or turbo); the sources consulted give no reliable figuresA rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 60,000–100,000 km. This is not a maintenance interval and does not predict a failure.

Sources from the original database