01 Coolant Loss From Coolant Valve, Engine Warning Light On, "Limp Home" Mode Active, Cabin Heating Is Insufficient (GROUP 80, NO. 14-07)

01 COOLANT LOSS FROM COOLANT VALVE, ENGINE WARNING LIGHT ON, "LIMP HOME" MODE ACTIVE, CABIN HEATING IS INSUFFICIENT

TECHNICAL SERVICE BULLETIN

APPLICABLE MODELS AND YEARS

01 19 99 2033806/9 January 10, 2019. Supersedes Technical Service Bulletin Group 01 number 16-80 dated October 13, 2016 for reasons listed below.

CONDITION

The customer may have one or more of the following concerns:

• MIL on.
• Climate system heating performance is insufficient.
• Coolant level warning is on.
• Engine temperature is elevated.
• "Limp Home" mode is active.

Workshop findings: 

The results of the diagnosis based on the customer concern may reveal one or more of the following:

One of the following faults may be stored in the transmission control module (TCM), J217 (address word 0002):

• DTC P275300  (Transmission Fluid Cooler Control Circuit Open)
• DTC P275500  (Transmission Fluid Cooler Control Circuit High)
• Coolant loss is found from one or more control valves: N82, N509, or N488. Coolant may have migrated into the wiring harness through the connector and into various control units.
• Climate system heating performance is insufficient due to coolant loss as a result of coolant migration in the electrical harness, faults in 08-Heating and Air Conditioning Electronics that result from coolant migration in the electrical harness, or a faulty N82 control valve.

TECHNICAL BACKGROUND

Inspection of the coolant control valves N82, N509, or N488 reveals the presence of coolant inside the electrical connector as shown in the illustration (Figure 1).

The connectors, wiring harness, and/or connected control units may have been damaged from exposure to coolant (Figure 2).

PRODUCTION SOLUTION

Improved coolant control valves are installed in production.

SERVICE

1. Diagnose the defective coolant valve (N82, N509, or N488) using Guided Fault Finding (GFF) where the stored DTCs are found.
2. Replace the defective coolant valve.

   Tip:  Check the connectors, wiring harness, and connected control units for coolant damage. Perform repairs as necessary.

WARRANTY

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual  . Claims are subject to review or audit by Audi Warranty.

REQUIRED PARTS AND TOOLS

Please reference ETKA using the VIN of the subject vehicle to ensure that the correct valve is being ordered. 

ADDITIONAL INFORMATION

All parts and service references provided in this TSB (2033806) are subject to change and/or removal. Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.

©2019 Audi 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 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.