TT 201304

Technical Tips
Technical Tip
Topic
20-13-04TT - MIL ON with DTCs P2400 or P2404
Market area
United States 444 Volkswagen of America, Inc. (6444)
Brand
Volkswagen
Date
September 01, 2017
Condition
ATTENTION:
THIS IS A TECH TIP, NOT A TECHNICAL BULLETIN.
TECH TIPS ARE NOT ASSOCIATED WITH WARRANTY CLAIMING.
MIL ON with DTCs P2400 or P2404
Model(s)
Year
Touareg
2011-2014
Eng. Code
3.6L
(CGRA)
Trans. Code
VIN Range From
VIN Range To
All
All
All
Technical Background
The following DTCs P2400 and/or P2404 may be set by faulty Coolant Pump Change Over Valve.
Service
The coolant pump has a vacuum controlled servo to control the flow of coolant. If the diaphragm fails, coolant can get
into the vacuum supply line for the Leak Detection Pump (LDP). With a hand held vacuum tool, apply vacuum to the
coolant pump vacuum port. If it will not hold vacuum, replace the coolant pump and the vacuum supply line as
necessary and retest operation.
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Technical Tips
Example of coolant in the vacuum supply line.
Additional Information
Revision History
Revision Number
Released Date
Reason For Update
2035922/3
9/1/17
Update to information.
2035922/2
7/12/17
Update to latest standard
2035922/1
11/29/13
Original publication
© 2017 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.
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