Technical Service Bulletin
01 Coolant loss from coolant valve, engine warning light on, "Limp Home" mode active, cabin heating is
insufficient
01 15 31 2033806/7 July 21, 2015. Supersedes Technical Service Bulletin Group 80 number 14-07 dated August
11, 2014 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A6, A7

2012

All

Not Applicable

A6, A7

2013

000001 - 155596

Not Applicable

A8

2010 - 2012

All

Not Applicable

A8

2013

000001 - 034562

Not Applicable

Q7

2011 - 2013

All

Not Applicable

Q7

2014

000001 - 000973

Not Applicable

A5 Cabriolet

2012 - 2013

All

Not Applicable

A5 Cabriolet

2014

000001 - 000174
900000 - 900019

Not Applicable

TT

2012 - 2014

All

Not Applicable

A4

2012 - 2013

All

Not Applicable

A4

2014

N000001 - N000184
A000001 – A247958

Not Applicable

Q5

2012 - 2014

All

Not Applicable

A5

2012

All

Not Applicable

A5

2013

000001 - 077920
900000 - 903086

Not Applicable

Condition
REVISION HISTORY
Revision

Date

Purpose

7

-

Revised title (Changed prefix to “01”)
Revised Production Solution (Updated to show that solution is now
implemented)

6

8/11/2014

Revised Warranty (Updated service number and labor operations)

5

3/11/2014

Revised title

© 2015 Audi of America, Inc.

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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
• The customer may have one or more of the following concerns:
• MIL is on.
• Climate system heating performance is insufficient.
• Coolant level warning is on.
• Engine temperature is elevated.
• “Limp Home” mode is active.
• The results of the diagnosis based on the customer complaint may reveal one or more of the following:
• One of the following faults may be stored in the transmission control module (address word 02):
- 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).

Figure 1. Coolant residue in the connector housing of the
coolant regulating valve.

© 2015 Audi of America, Inc.

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

Figure 2. Corrosion formation on the connector pins.

Production Solution
Improved coolant control valves are installed in production.

© 2015 Audi of America, Inc.

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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
Service
1. Diagnose the defective coolant valve (N82, N509, or N488) using Guided Fault Finding (GFF) where 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
Claim Type:

Use applicable claim type. If vehicle is outside any warranty, this Technical Service
Bulletin is informational only.

Service Number:

When servicing N82: 8015
When servicing N488 or N509: 1945

Damage Code:

0050

Labor Operations:

See Elsa for the specific model being serviced for this concern:
For solenoid valve N82:
See Elsa for specific labor operations

8015 9999

Use actual time

See Elsa for specific labor operations

1945 9999

Use actual time

GFF

0150 0000

Time stated on
diagnostic protocol

For solenoid valves N488 or N509:

Diagnostic Time:

(Max 50 TU)
Road test prior to service procedure

No allowance

0 TU

Road test after service procedure

No allowance

0 TU

Technical diagnosis at dealer’s discretion
(Refer to Section 2.2.1.2 and Audi Warranty Online for DADP allowance details)
Claim Comment:

As per TSB #2033806/7

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.

© 2015 Audi of America, Inc.

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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
Required Parts and Tools
Please reference ETKA using the VIN of the subject vehicle to ensure that the correct valve is being
ordered.
Part Number

Part Description

Quantity

4H0121670A

Solenoid valve

1

4H0121671D

Solenoid valve

1

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 service manuals for the latest information.

© 2015 Audi of America, Inc.

Page 5 of 5

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.