Common Problems with the
2014–2019 Mercedes-Benz GLA (X156)

We've identified 2 known issues that can affect the 2014–2019 Mercedes-Benz GLA (X156). 1 of these are serious faults that could be expensive to repair.

Known Issues

Serious

Moderate

Minor

The 2014–2019 period has 1 more issue than the Mercedes-Benz GLA (X156) average across all year periods.

All Known Issues

Timing Chain Stretch (M270/M274 Engines)

SeriousEngine

Petrol models can suffer from timing chain stretch, which if ignored, can lead to catastrophic engine failure.

Most affected: GLA 180, GLA 200, GLA 250

Estimated cost: £800–£1,800Affects: 2014–2019Often appears around: 60k-100k miles

Typical symptoms

•Rattling sound on cold start
•Engine management light (timing codes)

What to inspect before you buy

✓Listen carefully during a cold start
✓Check for consistent oil change history

7G-DCT Gearbox Hesitation

ModerateGearbox & Transmission

The dual-clutch transmission can be clunky or hesitant, especially when cold or in stop-start traffic.

Most affected: GLA 200d, GLA 220d, GLA 250

Estimated cost: £300–£2,500Affects: 2014–2020Often appears around: 50k-80k miles

Typical symptoms

•Jerky low-speed shifts
•Hesitation when pulling away

What to inspect before you buy

✓Test drive from cold
✓Check service history for gearbox oil changes

Buying Tips for the 2014 Mercedes-Benz GLA (X156)

✓Ensure the DCT gearbox fluid was changed at 60,000 miles; without it, shifts can become jerky.
✓Listen for a metallic rattle on cold starts, which can indicate timing chain stretch on petrol engines.
✓Check the inner edges of the front tyres for excessive wear, indicating alignment issues common on UK roads.

2020 Mercedes-Benz GLA (X156)