A011512 2024344-

Technical Service Bulletin
01 MIL on, loss of performance (DTCs P0234, P0235, P0299, and/or P100D stored) (TDI Only)
01 15 12 2024344/3 March 3, 2015. Supersedes Technical Service Bulletin Group 01 number 13-80 dated March
25, 2013 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
Q7
2009 - 2015
All
TDI clean diesel
Condition
REVISION HISTORY
Revision
Date
Purpose
3
-
Revised title
Revised header data (Added models and model years)
Revised Service (Updated to ODIS instructions)
2
3/25/2013
Revised header data (Added MY and applicable models)
1
5/17/2010
Original publication
• MIL on.
• Vehicle has reduced performance (in “limp mode”).
• Various entries may be logged in the engine control module (ECM), J623 (address word 01):
• DTC P0234 (Turbo/Super Charger Overboost Condition)
• DTC P0235 (Turbo/Super Charger Boost Sensor A Circ.)
• DTC P0299 (Turbo/Super Charger Underboost)
• DTC P100D (Turbocharger adjustment difficulty of movement or blocked)
Technical Background
After recognizing that the boost pressure is too low or too high, the engine control module switches to emergency
operation and the engine performance is reduced via the injected fuel quantity (“limp mode”).
Variances in boost pressure can be caused by:
• Dirty or clogged air intake.
• Leak in charge air pipes (boost air hoses, intercooler) caused by physical damage or a loose connection.
• Exhaust manifold or compensator pipe (the pipe between turbo charger and exhaust manifold) is damaged.
The inner pipe of these components may be broken, allowing particles to get to the turbine adjustment.
© 2015 Audi of America, Inc.
Page 1 of 2
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
Audi 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.
Technical Service Bulletin
Production Solution
Not applicable.
Service
1. Try to reproduce the customer complaint so that it can be clearly assigned to this bulletin.
2. Check air filter and snow mesh for dirt.
3. Perform pressure test on boost air system. If a boost leak is found, repair the leak and proceed to Step 4.
Otherwise, proceed to Step 5.
4. Using the test tool, select OBD >> 01 – Engine Control Module 1 >>Basic Setting >> Service regeneration of
particle filter. Follow the steps given by the test tool to burn off excess soot trapped by the filter due to the boost
leak. The regeneration may cancel automatically if the prerequisite conditions are not met or the regeneration
is not necessary.
Tip: A leak will increase the amount of soot produced. This can cause the diesel particle filter to be filled
much quicker than normal.
5. Perform visual check for leaks on connections and damage through animal bites.
6. Check the turbine adjustment of the turbocharger via final control diagnosis.
7. The rods for the turbine adjustment must move freely; otherwise, perform a visual check of the turbo charger or
remove it for a check.
If the adjustment is stiff, remove and carefully check the exhaust manifold (cylinder bank 1 and 2) with the
compensator pipe.
Tip: If rust particles or metal parts enter the turbine fan of the turbo charger, the adjustment mechanism
of the turbine blades becomes damaged and material on the turbine dislodges.
8. If the exhaust manifolds or compensator pipes are damaged, replace them.
9. To avoid repeat damage, replace the turbocharger, exhaust manifolds, and compensator pipes.
Tip: With repeat damage on the turbocharger, it is possible that foreign bodies entered the turbine of the
turbocharger.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB (2024344) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information.
© 2015 Audi of America, Inc.
Page 2 of 2
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
Audi 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.