bogmanglen Posted Monday at 07:08 PM Report Share Posted Monday at 07:08 PM (edited) All of a sudden, the AC quit yesterday. Forscan shows U0401 in the HVAC module. Fan blows, compressor clutch not engaged. 2021 Edge SEL 2.0 Any help appreciated! Edited Monday at 08:03 PM by bogmanglen 2 Quote Link to comment Share on other sites More sharing options...
Haz Posted Monday at 07:59 PM Report Share Posted Monday at 07:59 PM @bogmanglen: The 2021 Edge Workshop Manual diagnostic Pinpoint Test AA directs to perform a Powertrain Control Module (PCM) Self Test scan-tool/Forscan procedure to see if any PCM DTC(s) are revealed. PINPOINT TEST AA: U0401:00, U0401:82, U0422:68, U0422:81, U0452:82 Introduction 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 Causes Suspect module AA1 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 section in the Workshop Manual. No DIAGNOSE the observable symptom present. REFER to the appropriate Symptom chart in this section. If yes. report the PCM DTC(s) back here. If no, then a symptom-based diagnostic Pinpoint Test L, which evaluates many potential contributing factors, will need to be employed. Pinpoint Test L and several -- but not all -- of its supporting documents are attached below for you to assess, if you wish to personally pursue the solution or if you might choose to have a professional technician address it on your behalf. Good luck! PINPOINT TEST L - THE A-C (AIR CONDITIONING) IS INOPERATIVE - NO DIAGNOSTIC TROUBLE CODES (DTCS) - 2021 Edge Workshop Manual.pdf Climate Control System - System Operation and Component Description - 2021 Edge Workshop Manual.pdf Refrigerant System Tests - 2.0L EcoBoost - General Procedures - 2021 Edge Workshop Manual.pdf 3 Quote Link to comment Share on other sites More sharing options...
bogmanglen Posted Thursday at 06:09 PM Author Report Share Posted Thursday at 06:09 PM Looks like I may need a compressor...Oh well, I have manifold gauges and a vacuum pump... Does anyone happen to have the workshop pages for compressor replacement? 2021 2.0 SEL Thanks! Quote Link to comment Share on other sites More sharing options...
Haz Posted Thursday at 07:03 PM Report Share Posted Thursday at 07:03 PM @bogmanglen: Relevant sections from the 2021 Edge Workshop Manual are attached below as PDF documents... Good luck! Air Conditioning (A-C) Compressor - 2.0L EcoBoost - Removal and Installation - 2021 Edge Workshop Manual.pdf Air Conditioning (A-C) Compressor Belt - 2.0L EcoBoost - Removal and Installation - 2021 Edge Workshop Manual.pdf Fender Splash Shield - Removal and Installation - 2021 Edge-MKX Workshop Manual.pdf 2 Quote Link to comment Share on other sites More sharing options...
bogmanglen Posted Thursday at 07:41 PM Author Report Share Posted Thursday at 07:41 PM Thank you for your terrific contributions to this community, Haz! 1 2 Quote Link to comment Share on other sites More sharing options...
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