IsItAGoodCar
Reliability Guide

Common Problems with the
2018 Porsche Cayenne (9Y0)

The 2018 launch of the third-generation Cayenne (9Y0) brought it onto the MLB-Evo platform shared with the Bentley Bentayga and Audi Q8. It introduced 48V active anti-roll bars, making this large SUV handle like a sports car.

What changed for 2018

  • •Debut of the all-new 9Y0 generation, featuring a lighter aluminium-intensive chassis.
  • •Introduction of completely new turbocharged V6 and V8 engines, and the dropping of all diesel options.

Common MOT watch-outs

  • !Too new for significant MOT failure trends, but check for early tyre wear on 21/22-inch wheels.
  • !Software glitches affecting the massive new PCM touchscreen and digital dials.
3
Known Issues
1
Serious
0
Moderate
2
Minor

All Known Issues

12V Lithium Battery Failure

SeriousElectrics & Electronics

The proprietary 12V Li-ion starter battery can fail if the car is left sitting, and is very costly to replace.

Est. Repair Cost: £1,500–£2,500
Warning Signs:

Total power loss, Dash warnings "Electrical system error"

What to Inspect:
  • Verify battery health or recent replacement
Verified by IsItAGoodCar Research Team

PCM Infotainment Freezes

MinorElectrics & Electronics

The PCM system can suffer from screen freezes, slow response, and software glitches requiring dealer updates.

Est. Repair Cost: £0–£200 (Software update)
Warning Signs:

Screen freeze, Slow system response, Navigation glitches

What to Inspect:
  • Ensure latest software updates are applied
  • Test all infotainment functions
Verified by IsItAGoodCar Research Team

Active Grille Shutter Failure

MinorCooling System

The active grille shutters can seize from road debris, causing warning lights and reduced cooling efficiency.

Est. Repair Cost: £300–£600
Warning Signs:

Grille shutter warning, Reduced cooling performance

What to Inspect:
  • Check for grille shutter warning lights
  • Inspect shutters for debris damage
Verified by IsItAGoodCar Research Team

Buying Tips for 2018 Porsche Cayenne (9Y0)

  • Verify all 'Over The Air' software updates have been applied, as early cars suffered from infotainment crashes.
  • Check the operation of the Porsche Surface Coated Brakes (PSCB - white calipers) if fitted; they can occasionally squeal.
2019–2022
Check a 2018 Porsche Cayenne (9Y0) by Registration