Pinpoint Test Ab: U0401:00, U0401:82, U0422:68, U0422:81, U0452:82
WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
- DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition HVAC U0401:00 Invalid Data Received from ECM/PCM A: No Sub Type Information Sets when the HVAC control module receives invalid network data from the PCM. HVAC U0401:82 Invalid Data Received from ECM/PCM A: Alive/Sequence Counter Incorrect/Not Updated Sets when the HVAC control module receives invalid network data from the PCM. HVAC U0422:68 Invalid Data Received From Body Control Module: Event Information Sets when the HVAC control module receives invalid network data from the BCM. HVAC U0422:81 Invalid Data Received From Body Control Module: Invalid Serial Data Received Sets when the HVAC control module receives invalid network data from the BCM. HVAC U0452:82 Invalid Data Received From Restraints Control Module: Alive/Sequence Counter Incorrect/Not Updated Sets when the HVAC control module receives invalid network data from the RCM. Possible Sources
- Suspect module
- AB1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE MODULE SENDING INVALID DATA
- Ignition ON.
- Using a diagnostic scan tool, carry out the self-test for the module in question sending the invalid data.
Are any Diagnostic Trouble Codes (DTCs) present from the module sending the invalid data?
Yes DIAGNOSE the module sending the invalid data. REFER to the appropriate Service Article. No DIAGNOSE the observable symptom present. REFER to the appropriate Symptom chart.