TT 20 23 01

Technical Tip
20-23-01TT - EVAP Canister DTCs P0442, P0456
Transaction No:
2069238/1
Release date:
01/26/2023
Condition
ATTENTION:
THIS IS A TECH TIP, NOT A TECHNICAL BULLETIN AS TITLED.
TECH TIPS ARE NOT ASSOCIATED WITH WARRANTY CLAIMING.
Applicable Vehicles
Model(s)
Year
Eng. Code
Trans. Code
VIN Range From
VIN Range To
Atlas,
2022 - 2023
All
All
All
All
Atlas Cross Sport
Revision Table
Instance Number
Published Date
Version Number
2069238/1
01/26/ 2023
20-23-01TT
Reason For Update
Original publication.
Customer states MIL-ON, with either fault P0442 and/or P0456 stored in Engine/Motor Control Module -J623memory.
Technical Background
Some Model Year 2022 and 2023 Atlas vehicles built with EVAP canisters from supplier Leehan have been identified
having EVAP leaks due to manufacturing defects.
Service
Note:
Standard Guided Fault Finding process must still be followed for any EVAP leak diagnosis!
When performing a leak test for EVAP leak faults during Guided Fault Finding, pay close attention to the following
areas; EVAP leaks have been commonly found on the EVAP canister assembly, including (but not limited to) the
areas shown in the example pictures below (Figures 1, 2, and 3).
Soapy water may be used to assist in finding these leaks when the system is pressurized.
1
Technical Tip
20-23-01TT - EVAP Canister DTCs P0442, P0456
Transaction No:
2069238/1
Release date:
01/26/2023
Figure 1. EVAP leak along the upper seam, by the fresh air filter securing bracket.
Figure 2. EVAP leak along the right-hand seam, near a connecting hose.
2
Technical Tip
20-23-01TT - EVAP Canister DTCs P0442, P0456
Transaction No:
2069238/1
Release date:
01/26/2023
Figure 3. EVAP leak under a clip securing a connecting hose.
Additional Information
© 2023 Volkswagen Group of America, Inc. All rights reserved. Information contained in this document is based on
the latest information available at the time of printing and is subject to the copyright and other intellectual property
rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make
changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.
3