IsItAGoodCar
Reliability Guide

Common Problems with the
2023 Lexus RX (Mk5)

The launch of the fifth-generation RX brought a complete redesign, moving to the new GA-K platform. It introduced a new 'spindle body' design, a vastly superior touchscreen interface, and a range of new hybrid powertrains including a PHEV and a performance-focused turbo-hybrid.

What changed for 2023

  • •Debut of the all-new Mk5 RX on the GA-K platform.
  • •Introduction of the RX 450h+ (Plug-in Hybrid) and the high-performance RX 500h (Turbo Hybrid).

Common MOT watch-outs

  • !Too new for MOT data, but check for early software glitches affecting the new infotainment system.
  • !Minor issues with the new 'e-Latch' electronic door handles.
3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

Rear Motor Cable Corrosion ("Cablegate")

SeriousElectrics & Electronics

The latest RX models continue to use an exposed high-voltage connector for the rear motor that can suffer from corrosion in harsh UK winters, potentially leading to expensive electrical repairs.

Est. Repair Cost: £3,000–£5,000
Warning Signs:

Hybrid System Malfunction warning, AWD system disabled, Corrosion visible on the motor connector housing

What to Inspect:
  • Confirm if the latest improved cable and protective cover have been fitted
  • Check for any history of hybrid system alerts
Verified by IsItAGoodCar Research Team

CAN-Bus Security Vulnerability

SeriousElectrics & Electronics

While improved over the previous generation, high-end SUVs like the RX are targets for CAN-bus injection theft in the UK. Lexus has released plates and software to mitigate this.

Est. Repair Cost: Warranty / £150 for plates
Warning Signs:

Car stolen without keys, Headlight trim showing signs of tampering

What to Inspect:
  • Check if the Lexus security update/plates have been fitted by a main dealer
Verified by IsItAGoodCar Research Team

12V Battery Parasitic Drain

ModerateElectrics & Electronics

Similar to the NX, the latest RX can struggle to maintain 12V charge if the car is not used for several days.

Est. Repair Cost: £0 (Warranty / £150 AGM battery)
Warning Signs:

"Entry system failure" messages, Car won't start/dead battery, Settings resetting

What to Inspect:
  • Check the 12V battery health status
  • Ask if the owner has experienced any "dead car" scenarios
Verified by IsItAGoodCar Research Team

Buying Tips for 2023 Lexus RX (Mk5)

  • ✓Ensure the new 'Lexus Link Pro' touchscreen system operates quickly and doesn't freeze.
  • ✓On the RX 500h, check the seamless integration of the turbocharged engine and the DIRECT4 electric drive system.
20222024
Check a 2023 Lexus RX (Mk5) by Registration