IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

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IK1900228
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Title : 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)
Applies To : Post 2010 NGV

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
06/01/2016 ‐ Corrected diagnostic table layout
09/01/2015 ‐ Repaired iKNow link in step 7
06/30/2015 ‐ Changed formatting of tables in Diagnostic section to fit on one page when printed.
08/31/2015 ‐ Fixed hyperlink.
06/24/2015 ‐ Changed all occurences of reference to IK1900198 to reference IK1900235 instead.
05/26/2015 ‐ Fixed link on step 6 to properly route viewer to IK1900226

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DESCRIPTION
This document addresses Air Conditioning issues on the following 2010 to 2014 vehicles with a BCM.
The following procedures will guide the user through : Common Air Conditioning failure areas, diagnostic tools,
SRTs, and warranty filing.
Note: For anything Pre-2010, reference the Pre-2010 A/C HVAC Resource Center located IK1900156.

SYMPTOM
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN

FMI Description

2609

16

A/C High Pressure Protection

2609

15

Low Charge Protection

1079

1

5 volt sensor supply below normal

3985

9

A/C Control Head Circuit Failed To Communicate With Body Controller

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IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

1552

2

A/C Control Head Temperature Mix DM1

3981

2

A/C Control Head Mode Fault DM1

3984

2

A/C Control Head Air Inlet DM1

2058

9

Rear A/C Data Link Communication Failure

2058

14

Rear A/C Data Link Communication Failure

3982

2

A/C Rear Blower Speed Control Switch Error

3983

2

Rear A/C Temperature Control Switch Error

520465 2

Page 2 of 7

A/C Control Head Multiple Motor Faults

Customer Observations or Concerns:
•
•
•
•
•
•

Malfunction Indicator Light (MIL)
No cab air conditioning
"Warm" A/C
No air flow through vents
No rear A/C
Inoperative MaxxPro no-idle A/C system

SPECIAL TOOLS / SOFTWARE
Tool Description

Tool
Number

Comments

Robinair Air Conditioning Machine
or equivalent

34988

A/C recovery, vac, and
performance test

Instructions

SERVICE PARTS INFORMATION
Due to variety of configurations, reference the parts catalog for vehicle being repaired.
Parts Catalog

PROCEDURE OVERVIEW
Do not start engine until steps 2-4 have been completed. If the engine has been run
recently, allow the vehicle to sit for one hour so system pressures can stabilize.
Consider the following before beginning:
• Are any Air Conditioning related AFC’s open?
• Was the vehicle recently in for an Air Conditioning repair, in which the system was not properly filled or
serviced?
• Were A/C repairs made recently, and fault codes not cleared properly?
If the A/C issue is known (blown off hose, visible dye, inoperative blower motor) go directly to the respective
steps or iKNow articles listed below. Otherwise, go to step 1.
•
•
•
•
•

IK1900226 A/C Control Head Issues
IK1900225 A/C Mechanical Pressures diagnostics
IK1900223 A/C Sensor/ Electronic Issues
IK1900235 No-Idle HVAC Operational Check - STARTING POINT
IK1900227 Rear A/C Electrical and Mechanical Diagnostics

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IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

Page 3 of 7

DIAGNOSTIC STEPS
Step Action

Decision

Customer Interview:
Review the Repair Order to determine the following:

1

• What is the Air Conditioning System doing specifically? (No cold
air, not cold enough, no air flow at vent, or no defrost?
• When does the concern occur? Vehicle stationary, when idling
overnight, or going down the road?
• Is the problem intermittent, or happen consistently?
• Have you had the vehicle serviced recently? When and where?
Was there an A/C related service performed during that
service?
• Does issue concern the passenger compartment, the sleeper, or
both?
• If equipped with a No-Idle system does the issue only happen
when utilizing the No-Idle System?

Yes: Cab A/C works correctly
but rear A/C does not: Go to
step 7.

Yes: Concern is with MaxxPro
No-Idle HVAC unit: Go to
IK1900235

Is the problem confined to the rear A/C system while the Cab A/C
works correctly?
Is the problem confined to the operation or performance of the
MaxxPro No Idle system?

Step Action
2

No: Go to step 2.

Decision

Preliminary checks:

Yes: Repair as necessary.
Restore system to operational
Note: Do not start engine until steps 2-4 have been completed. If the condition and operate the A/C
engine has been run recently, allow the vehicle to sit for one hour to system to determine if the
allow system pressures to stabilize.
complaint was corrected.
Perform a visual check of the A/C system to verify that no obvious
problems are present. With the engine off, inspect the following
items:

No: Go to step 3.

•
•
•
•
•
•
•
•
•
•
•
•

Compressor and clutch mounting
Compressor clutch coil wiring and connection
Compressor drive belt and belt tensioner
A/C hoses and connections
Condenser mounting
Condenser fins (blockage by debris)
Receiver-drier mounting
Expansion valve mounting
Filter element
Fresh air module drains
Fresh air module mounting and overall condition
Electrical connections to pressure transducer and low pressure
switch
• Electrical connections to actuators for airflow doors (recirculate,
temperature, and mode doors)
• Fan speeds and mode door operation

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