Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC U0424-81: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received [11/2015 - ]: Procedure
- CHECK DTC OUTPUT (AIR CONDITIONER)
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
- Check if DTCs related to the air conditioning system (A/C) are output.
Body Electrical > Air Conditioner > Trouble Codes
Result
Result Proceed to DTCs related to A/C are not output. A DTCs related to A/C are output. B - Turn the power switch off.
Result:
A
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [11/2015 - ]
Result:
B
GO TO DTC CHART (AIR CONDITIONING SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 11/2017] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2017 - 12/2018] , or refer to DIAGNOSTIC TROUBLE CODE CHART [12/2018 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - 07/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ]
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.