Technical Service Bulletin
87 Air conditioning inoperative
87 13 44 2020124/11 August 26, 2013. Supersedes Technical Service Bulletin Group 87 number 13-43 dated July
12, 2013 for reasons listed below.
Model(s)

Year

VIN Range

A4

2009-2012

All

A4

2013

N000001 - N045670

A4

2013

A000001 – A231729

A5

2008-2012

All

A5

2013

000001 - 071355

S5 / RS5

2013

900000 - 902787

A5 Cab

2010-2012

All

A5 Cab

2013

000001 - 015616

S5 / RS5 Cab

2013

900000 - 900501

A6

2005-2012

All

A6

2013

000001 - 134357

A7

2012

All

A7

2013

000001 - 134357

A8

2004-2012

All

A8

2013

000001 - 029602

Q5

2009 - 2012

All

Q5

2013

000001 - 083307

© 2013 Audi of America, Inc.

Vehicle-Specific Equipment

Not Applicable

Page 1 of 8

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
Condition
REVISION HISTORY
Revision

Date

Purpose

11

-

Revised header data (Added models, model years, and DTCs)

10

7/12/2013

Revised Warranty (Changed service number)

9

6/11/2013

Revised header data (Added models and model years)

8

11/16/2012

Revised header data (added D3 pull ahead)
Revised Service
Revised Warranty (Additional SRT)

7

9/5/2012

Revised Service (Added labels a-d)
Revised Warranty

6

7/23/2012

Revised Service (Added an additional descriptive note and text)

5

8/15/2011

Revised Service (Added additional steps and images)
Revised Warranty

4

4/8/2011

Revised Condition, Technical Background, Production Solution

3

3/22/2011

Revised header data (Added models and model years)
Revised Technical Background, Production Solution, Service, and
Required Parts and Tools

2

4/23/2010

Revised Technical Background, Production Solution, and Service

1

2/27/2009

Original publication

• Air conditioning is inoperative.
• The HVAC blower functions normally.
• Battery discharged; however, when charged, there is no bus silence when vehicle ignition is off.

© 2013 Audi of America, Inc.

Page 2 of 8

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
Technical Background
• The A/C pressure/temperature sensor, G395, leaks refrigerant. This causes sensor G395 to show an incorrect
or implausible value when reading MVBs. An incorrect signal or a low refrigerant level in the system can cause
the air conditioning compressor to deactivate.
• The LIN cable connecting the vehicle electrical system control module, J519, to sensor G395 is pinched or cut.
This affects the A4/S4, A5/S5 Coupe and Cabriolet, and Q5 vehicles. The A6 and A8 are not affected by this
type of failure.
• The pressure sensor G395/G65 sends an incorrect signal that prevents bus silence and the battery is
discharged.
Tip: Sensor G395 is a LIN slave of the vehicle electrical system control module. The vehicle electrical
system control module transfers the information provided by the sensor via the comfort data bus to the climate
control module, J255.

Production Solution
An improved sensor G395 was introduced into series production and the wiring manufacturer’s processes were
optimized.

Service
For A4/S4 (8K), A5/S5 Coupe/Cabriolet (8T/8F), Q5, A6, A7, A8, R8:
If DTCs for sensor G395 are stored in the climate control module, J255, then check the system pressures and
refrigerant volume.
• If system pressures and refrigerant volume are low, check for refrigerant leaks at sensor G395. If a leak is
found, then replace sensor G395.
• If the system pressure and refrigerant volume are correct, perform guided fault finding (GFF). If an implausible
pressure value is found in MVB 1, field 4, then replace sensor G395.

Tip: Install only the improved G395. See part numbers in Required Parts and Tools.

© 2013 Audi of America, Inc.

Page 3 of 8

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
Only for A4/S4 (8K), A5/S5 Coupe/Cabriolet (8T/8F), Q5:
1. Check the diagnostic fault memory for two possible DTC scenarios:
DTC Scenario 1
08 - Climate Control Module - J255:
DTC 00457 - Vehicle Electrical System Control Module – J519- Please check DTC memory
DTC 00256 - A/C Pressure/temperature Sensor –G395- Incorrect Signal
-AND09 - Vehicle Electrical System Control Module – J519:
DTC 00256 - A/C Pressure/temperature Sensor –G395- No signal/communication

DTC Scenario 2
08 - Climate Control Module - J255:
DTC 00457 - Vehicle Electrical System Control Module – J519- Please check DTC memory
DTC 00256 - A/C Pressure/temperature Sensor –G395- Incorrect Signal
-AND09 - Vehicle Electrical System Control Module – J519:
DTC 01592 - Air Quality Sensor –G238- No signal/communication
DTC 00256 - A/C Pressure/temperature Sensor –G395- No signal/communication

If scenario 1 is the case, perform step 7.
If scenario 2 is the case, perform steps 2 – 6.
Tip: The existing LIN cable connecting the vehicle electrical system control module to sensor G395
could be pinched or cut if scenario 2 is the case.
2. Check the LIN cable connecting the vehicle electrical system control module to sensor G395 according to
GFF.
3. Check the wire terminals in the connector at sensor G395 for proper attachment, possible corrosion, and for
any pins that may be pushed back or widened.
4. Check to make sure there is proper voltage going to the sensor and verify the ground is not intermittently open
(wiggle test).

© 2013 Audi of America, Inc.

Page 4 of 8

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
5. Check the integrity of the wire harness.
There are two known sections in the wiring
harness that can be affected, but the potentially
affected areas are not limited to these two known
sections. One of the known sections is in the
driver’s footwell area where the wire harness
enters the interior of the car from the engine bay
(Figure 1).

Figure 1. Wire harness in driver footwell area.
The second known section is in the wire harness
located under the driver’s side headlight (Figure
2).

Figure 2. Wire harness under driver’s side headlight.
6. If a cut wire is found, install an overlay wire for the LIN bus signal. Do not attempt to repair the existing wire
harness.

© 2013 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
a. Route the new LIN bus wire from the vehicle
electrical system control module, J519, to the
sender for sensor G395 so that it enters the
interior of the vehicle through the driver’s side
fender/lower A-pillar area through the
grommet indicated in the images at right
(Figures 3 and 4).
Tip: Do not route the wire through the
same opening used by the existing wire
harness.

Figure 3. Grommet in driver’s side fender/lower A-pillar
area used for pass-through for new overlay wire.

Figure 4. Access hole in grommet.
Tip: The LIN bus between the vehicle electrical system control module and sensor G395 may
contain a junction point shared with other modules depending on the vehicle. Ensure that the junction
points are maintained when routing the overlay.

© 2013 Audi of America, Inc.

Page 6 of 8

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
On vehicles with a charisma switch (ride
selection switch located on the instrument
panel) route the new cable of the sender for
sensor G395 to junction B549 (Figure 5, red
arrow).

Figure 5. Cable routing with charisma switch option.
b. Seal off the opening around the wire with Butyl
sealant to prevent water intrusion (Figure 6).

Figure 6. Access hole in grommet to be sealed with Butyl
sealant.
7. Replace the sender for sensor G395.
© 2013 Audi of America, Inc.

Page 7 of 8

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
Warranty
Claim Type:

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

Service Number:

8757

Damage Code:

0010

Labor Operations:

Repair front left wiring loom

9715 9999

165 TU

Drain and refill refrigerant (if necessary)

8703 1700

50 TU

Check front left wiring loom

9715 9999

175 TU

Replace A/C Pressure/temperature Sensor –
G395-

8709 XXXX

XX TU

GFF

0150 0000

Time stated on
diagnostic
protocol (MAX 50
TU)

Road test prior to service procedure

No allowance

0 TU

Road test after service procedure

No allowance

0 TU

Diagnostic Time:

Claim Comment:

See ElsaWeb for
applicable labor
operations

As per TSB #2020124/11

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
Part Number

Part Description

Quantity

4H0959126A

Pressure sensor

1

Additional Information
All parts and service references provided in this TSB (2020124) are subject to change and/or removal. Always
check with your Parts Department and service manuals for the latest information.

© 2013 Audi of America, Inc.

Page 8 of 8

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.