IsItAGoodCar
Reliability Guide

Common Problems with the
2025 Peugeot 408

We've identified 2 known issues that can affect the 2025 Peugeot 408. 1 of these are serious faults that could be expensive to repair.

2
Known Issues
1
Serious
1
Moderate
0
Minor

All Known Issues

PHEV On-Board Charger and Traction Battery Faults

SeriousElectrics & Electronics

Plug-in hybrid 408 models can experience on-board charger (OBC) and traction battery faults, with documented failure codes such as P12F03. The charging system may stop working entirely, leaving the car driveable only on its petrol engine. Spare parts lead times can be extended, and traction battery replacement costs are very high. PHEV buyers should verify that any charging cable recall has been completed and that the HV battery has no fault history.

Est. Repair Cost: £1,500–£5,000
Warning Signs:

Charging session fails or aborts unexpectedly, Fault code P12F03 or charging system warning, Car runs on petrol engine only despite charged battery, Drivetrain warning light illuminated

What to Inspect:
  • Plug into a Type 2 AC charger and verify continuous charging without interruption
  • Ask for evidence of completed charging cable recall work
  • Check for any stored high-voltage or charging system fault codes
Verified by IsItAGoodCar Research TeamUpdated

e-EAT Automatic Gearbox Hesitation

ModerateGearbox & Transmission

The eight-speed e-EAT automatic gearbox fitted to plug-in hybrid models can be a weak link, with hesitant or unsmooth transitions between electric and petrol power. The gearbox may drop two or three ratios when extra acceleration is requested, sending revs and noise levels soaring without a proportional pick-up in pace. The issue is most noticeable during brisk acceleration or when the hybrid system switches between power sources.

Est. Repair Cost: £300–£1,500
Warning Signs:

Hesitation when switching between electric and petrol power, Gearbox drops multiple ratios under acceleration, Rev levels rise without proportional acceleration

What to Inspect:
  • Test firm acceleration from low speed to check for gearbox hesitation
  • Drive in hybrid mode to feel transitions between electric and petrol
  • Ask whether any gearbox software calibration updates have been applied
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2025 Peugeot 408

  • Check for a comprehensive service history with invoices—wet-belt longevity depends on correct oil and strict intervals.
  • Ensure all electronics and dashboard displays function correctly; test the i-Cockpit touchscreen for lag or freezing.
  • Test drive the car on various road surfaces to check for suspension noise.
  • Verify the hybrid system (if fitted) operates smoothly—early e-HYBRID models had software-related drivability niggles.
  • Check the frameless windows for wind noise and smooth operation—seal deterioration is a known issue.
  • Inspect the alloy wheels for corrosion—diamond-cut finishes are prone to lacquer lifting on UK roads.
2023–20242026
Check a 2025 Peugeot 408 by Registration