Hummer H2. Manual - part 2214

DTC C0712 

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you perform the Air Suspension Diagnostic System 
Check?

Go to Step 2

Go to Diagnostic 

System Check - Air 

Suspension

2

1. Install a scan tool.  

2. Turn ON the ignition, with the engine ON.  

3. With a scan tool, command the compressor relay ON 

and OFF.  

Does the compressor relay turn ON and OFF with each 
command?

IMPORTANT:

Be sure all doors are closed and engine is running for this 
test.

Go to 

Diagnostic 

Aids

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the compressor relay.  

3. Turn ON the ignition, with the engine ON.  

4. Connect a test lamp to ground.  

5. Probe the control circuit of the compressor relay with a 

test lamp that is connected to ground.  

6. With a scan tool, command the compressor relay ON 

and OFF.  

Does the test lamp turn ON and OFF with each command?

IMPORTANT:

Be sure all doors are closed and engine is running for this 
test.

Go to Step 4

Go to Step 5

4

1. Connect a test lamp between the control circuit of the 

compressor relay and the ground circuit of the 
compressor relay.  

2. With a scan tool, command the compressor relay ON 

and OFF.  

Does the test lamp turn ON and OFF with each command?

IMPORTANT:

Be sure all doors are closed and engine is running for this 
test.

Go to Step 8

Go to Step 10

5

Does the test lamp remain illuminated with each command?

Go to Step 7

Go to Step 6

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

DTC C0713 

Circuit Description 

The air suspension compressor has a temperature sensor. The overtemperature sensor is a thermal limit switch 

6

Test the control circuit of the compressor relay for a short to 
ground or an open. Refer to Circuit Testing and to Wiring 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 

13

Go to Step 9

7

Test the control circuit of the compressor relay for a short to 
voltage. Refer to Circuit Testing and to Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 

13

Go to Step 9

8

Inspect for poor connections at the compressor relay. Refer to 
Testing for Intermittent Conditions and Poor Connections 
and to Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 

13

Go to Step 11

9

Inspect for poor connections at the harness connector of the 
Air Suspension Module. Refer to Testing for Intermittent 
Conditions and Poor Connections and to Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 

13

Go to Step 12

10

Repair the ground circuit of the air suspension relay. Refer to 
Wiring Repairs in Wiring Systems. 
Did you complete the repair?

Go to Step 

13

-

11

Replace the air suspension relay. 
Did you complete the replacement?

Go to Step 

13

-

12

1. Replace the air suspension module. Refer to Module 

Assembly Electronic Suspension Control 
Replacement .  

2. Perform the trim height calibration procedure for the air 

suspension module, if necessary, after check trim height 
procedure.  

Did you complete the replacement?

IMPORTANT:

Always perform the check trim height procedure after air 
suspension module replacement.

Go to Step 

13

-

13

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within the Conditions for Running 

the DTC.  

Does the DTC reset?

Go to Step 2

System OK

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

that is in the normally closed position. This provides a ground signal to the air suspension module. The air 
suspension module monitors the temperature sensor for a compressor overtemperature condition. On receipt of 
a compressor overtemperature condition the air suspension module switches off the compressor relay. The relay 
cannot be switched on again until at least three minutes after removal of the overtemperature condition. 

Conditions for Running the DTC 

Ignition ON. 

Conditions for Setting the DTC 

Air suspension module senses a compressor overtemperature condition. 

Action Taken When the DTC Sets 

z

Air suspension functionality is suspended.  

z

SERVICE AIR SUSPENSION message is displayed.  

Conditions for Clearing the DTC 

The DTC will clear when the condition for setting the DTC is removed. 

Diagnostic Aids 

z

This DTC is set when the compressor has run so long that it has overheated.  

z

The compressor has overheated because of a blockage in the air system.  

z

Bad compressor motor ground will set the DTC.  

Test Description 

The numbers below refer to the step numbers on the diagnostic table. 

3: Tests whether the condition is module, system, or condition related.  

4: Tests if the condition has been corrected or identified as specified in the supporting text.  

6: Tests if the DTC sets during normal operating conditions.  

DTC C0713 

Step

Action

Yes

No

Schematic Reference:Suspension Controls Schematics

1

Did you perform the Air Suspension Diagnostic System 
Check?

Go to Step 2

Go to Diagnostic 

System Check - Air 

Suspension

1. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

DTC C0716 

Circuit Description 

The Air Suspension Inlet Valve-LR is controlled by the Air Suspension Module. The Air Suspension Module 
provides a switched path to voltage whenever inlet valve activity is required. The Air Suspension Module 
monitors the inlet valve circuity to determine if the voltage level agrees with the command state. 

Conditions for Running the DTC 

Ignition on. 

2

3. With a scan tool, monitor the DTC Information for 

DTC C0713 in the Air Suspension Module.  

Does the scan tool indicate that DTC C0713 is current?

Go to Step 4

Go to Step 3

3

Most occurrences of this DTC are caused by overload of the 
compressor. Review the Air Suspension System with the 
customer to verify the conditions under which the DTC set. 
Did vehicle operation cause this DTC to set?

Go to 

Diagnostic 

Aids

Go to Step 4

4

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within normal operating conditions. 

Does the DTC reset?

Go to Step 5

System OK

5

Replace the air suspension compressor. Refer to Compressor 
Automatic Level Control Replacement . 
Did you complete the replacement?

Go to Step 6

-

6

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within normal operating conditions. 

Does the DTC reset?

Go to Step 7

System OK

7

1. Replace the air suspension module. Refer to Module 

Assembly Electronic Suspension Control 
Replacement .  

2. Perform the trim height calibration procedure for the air 

suspension module if necessary after check trim height 
procedure.  

Did you complete the replacement?

IMPORTANT:

Always perform the check trim height procedure after air 
suspension module replacement.

System OK

-

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2