DTC U0424-81: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC OUTPUT (AIR CONDITIONER)
Pre-procedure1
- None.
- Check if DTCs related to the air conditioning system (A/C) are output.
Body Electrical > Air Conditioner > Trouble Codes
Result
Result Proceed to DTCs are not output A DTCs are output B
Post-procedure1
- Turn the ignition switch off.
Result:
A
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
B
GO TO DTC CHART (AIR CONDITIONING SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ]