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GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5792
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Air ride problem.

Customer Question

air ride problem.
Submitted: 1 year ago.
Category: GM
Expert:  Reggie Whiddon replied 1 year ago.

do you have a scan tool with capability of reading codes and data from module?

Expert:  Reggie Whiddon replied 1 year ago.

IF your air bags are deflated perhaps they have been leaking and caused your compressor to run at an abnormal rate, there is a thermistor built into the motor that will prevent it from coming on if it is burned up, fire protection built in.

Customer: replied 1 year ago.

compressor had not been functioning properly for quite some time. kicks on for a couple seconds when you turn the key to the on position but it kicks right back off. But the air bags were still holding pressure just fine. After pulling it in, checking fuses, wiring and air lines, we replaced the compressor relay. Then after pulling out the air bags deflated, and since we had not yet resolved the compressor problem it wont pump them back up. I scanned the air ride module and ive got codes CO711 pressure sensor circuit fault and a CO713 over temperature. so that does sound like its been hot. but I wonder why the air bags had still been holding pressure just fine, but now they arent

Expert:  Reggie Whiddon replied 1 year ago.

Yes that sounds like compressor failure. It is important to remember that once the bags are inflated they hold pressure the check valve and solenoid keep the pressure in so in essence you could inflate a bag, take the air line off and if it is in proper working order it would maintain that pressure, sounds to me like you need a compressor and a couple of bags, common and you did right by replacing the relay

Customer: replied 1 year ago.

Okay so I got a chance to do some further testing today, I'm just not yet convinced that the compressor and/or the bags are the problem. I can operate the compressor from my inflator switch in the back hatch and it runs fine and doesn't shut down, I can disconnect the compressor and apply power directly to the wires and again, it runs fine. I found a procedure on AllData for pressurizing the bags after they've been deflated or after installing new ones, it directed me to command the compressor on using a scan tool. When I command the unit on with the scan tool I get nothing. I'm not understanding why it runs for a few seconds and shuts down after turning the ignition on, but I am incapable of commanding the unit on manually using my scan tool. Is there a valve of some sort that directs airflow to either the suspension, or the auxiliary inflator pump port? I'm sure there must be since there's only one compressor. If so, I'm thinking maybe that valve is stuck and acts like a blockage when its trying to air up the bags, and that causes it to shut down.

Expert:  Reggie Whiddon replied 1 year ago.
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2003 Hummer H2 6.0L, V8, USA/CanadaTIRESTORE12 - Woodham Tire & Auto

Hotline Archive

With Service Manuals diagrams, components, TSBs, and R&R procedures

Number:414995

Vehicle Application:

2003 H2 6.0

2004 H2 6.0

2005 H2 6.0

2006 H2 6.0

2008 H2 6.2

Customer Concern:The rear of the vehicle sits too low. The compressor runs for a short time and does not fill the air bags. C0711 resets.

Average Reported Mileage:115858

Tests/Procedures:1. Access the pressure sensor wiring and verify 5 volt reference and a ground.

2. Backprobe the circuit and check for voltage between 0.5 and 0.4.75 on the signal circuit.

3. If the signal is out of range, replace the sensor/compressor assembly.

4. If the assembly is replaced with the dual stage compressor, DO NOT use SPS to program the new module. If the new dual stage ASC module is programmed, it will have to be replaced again.

5. Perform the trim height calibration. Refer to GM PIT3324.

Author:

***** *****

Related Document(s):

ESC Compressor Relay Location

Suspension Position Calibration

Diagnostic Codes

C0711

Potential Causes

With Service Manuals diagrams, components, TSBs, and R&R procedures

Electronic Controlled Air Suspension (ECAS) Pressure Sensor

Confirmed Fix Summary

Confirmed Fix

With Service Manuals diagrams, components, TSBs, and R&R procedures

11 - Replaced Air Suspension Compressor Assembly

3 - Installed Coil Spring Conversion Kit

1 - Replaced Rear Suspension Air Bags

1 - Replaced Air Suspension Line(s) and Replaced Rear Suspension Air Bags

Confirmed Fix Details

TechReported Fix DetailsConfirmed Fix

1Pat Dever ext. 4452
November 23, 20152003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor Assembly
125,000 milesReplaced Air Suspension Compressor Assembly

2DansService
April 13, 20152003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor Assembly
107,531 milesReplaced Air Suspension Compressor Assembly

3Russ Kouk
September 11, 20132003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor Assembly
51,548 milesReplaced Air Suspension Compressor Assembly

4Cameron Charnyak
May 16, 20132003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor Assembly
116,000 milesReplaced Air Suspension Compressor Assembly

5Rod's Best Auto Care
September 17, 20152005 Hummer H2, 6.0L, V8, VIN U, USA *
Air Suspension Compressor AssemblyReplaced Air Suspension Compressor Assembly

6Daryl Nelson
August 19, 20152007 Cadillac Escalade Esv, 6.2L, V8, VIN 8, USA *
Air Suspension Compressor AssemblyReplaced Air Suspension Compressor Assembly

7Mark Barnett
July 7, 20152007 Cadillac Escalade, 6.2L, V8, VIN 8, USA *
Air Suspension Compressor AssemblyReplaced Air Suspension Compressor Assembly

8Sam Hagen
December 11, 20142004 Hummer H2, 6.0L, V8, USA *
Air Suspension Compressor AssemblyReplaced Air Suspension Compressor Assembly

9Seth Olson
September 6, 20132008 Hummer H2, 6.2L, V8, VIN 8, USA *
Air Suspension Compressor Assembly
70,879 milesReplaced Air Suspension Compressor Assembly

10(+) 11-11Bob Bortz
February 18, 20132004 Hummer H2, 6.0L, V8, USA *
Air Suspension Compressor Assembly
146,303 milesReplaced Air Suspension Compressor Assembly

1Thomas Gieryic
September 10, 20152003 Hummer H2, 6.0L, V8, USA
Coil Spring Conversion KitInstalled Coil Spring Conversion Kit

2Gardy's Auto 1
July 25, 20152006 Hummer H2, 6.0L, V8, VIN U, USA *
Coil Spring Conversion Kit

- Customer chose to replace air bag system with coil springs.

Installed Coil Spring Conversion Kit3Brian Rehbein
September 1, 20152005 Hummer H2, 6.0L, V8, VIN U, USA *
Coil Spring Conversion Kit

- used a replacement kit from Arnott Suspenchions

Installed Coil Spring Conversion Kit1Kevin Carroll
April 1, 20152008 Hummer H2, 6.2L, V8, VIN 8, USA *
Air Suspension Line(s)
Rear Suspension Air Bags

- Replaced air bags and lines from compressor assembly to air bags

Replaced Air Suspension Line(s) and Replaced Rear Suspension Air Bags1R***** *****
July 7, 20142004 Hummer H2, 6.0L, V8, USA *
Rear Suspension Air Bags

- Leaking air bags again. used oe parts

Replaced Rear Suspension Air Bags

- Confirmed Fix - Exact Vehicle Match- Confirmed Fix - Similar Vehicle Match*- Indicates a Similar Vehicle - Not an exact match to the vehicle selected

What Fixed It ?

Please describe what was done to fix the vehicle you were working on.
Example 1: Replaced fuel pump
Example 2: Cleaned Throttle Body

If the problem you were fixing is NOT the same as the problem described in the "Customer Concern" please use the Post Fix link to share your fix.

Still need help? Click here to access the Hotline Call Request Form to schedule a call from one of our Carline Specialists.

300 characters leftPosting Guidelines

Comments may be posted publicly with your username.

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Copyright 2001 - 2015 Identifix, Inc. All rights reserved. Use of this online service is subject to Terms of Use

Expert:  Reggie Whiddon replied 1 year ago.
  • CONTACT REPAIR HOTLINE

  • HOW TO USE DIRECT-HIT

  • 1

    LATEST UPDATES

  • EXPAND YOUR KNOWLEDGE

HOME

SEARCH FIXES

SERVICE MANUALS

MAINTENANCE

ESTIMATING

HOTLINE

MY SHOP

MY DIRECT-HIT

BOOKMARKS

Search

Information Available

Logout

Referral

New Vehicle

Can't Find Service Manual Info?

Post Fix

2003 Hummer H2 6.0L, V8, USA/CanadaTIRESTORE12 - Woodham Tire & Auto

Hotline Archive

With Service Manuals diagrams, components, TSBs, and R&R procedures

Number:183688

Vehicle Application:

2003 H2 6.0

Customer Concern:The "SERVICE AIR SUSPENSION" lamp is always on. The system will not raise the rear suspension with weight added to the rear. Current code C0711. Has tried a new suspension control module.

Average Reported Mileage:68970

Tests/Procedures:1. The new Electronic Controlled Air Suspension (ECAS) must be programmed with new software, see TSB #02-03-99-002.

2. Prior to programming, check that the 60 amp ECAS fuse is OK.

Tech Tips:See TSB #02-03-99-002.

Author:

Ralph Dahlen

Diagnostic Codes

C0711

Potential Causes

With Service Manuals diagrams, components, TSBs, and R&R procedures

Defective Electronic Controlled Air Suspension (ECAS) Module Program — ECAS module program needed.

Electronic Controlled Air Suspension (ECAS) Pressure Sensor

Confirmed Fix Summary

Confirmed Fix

With Service Manuals diagrams, components, TSBs, and R&R procedures

3 - Programmed Electronic Controlled Air Suspension (ECAS) Module

3 - Replaced Air Suspension Compressor Relay

1 - Replaced Air Suspension Compressor

1 - Replaced Air Suspension Compressor and Replaced Air Suspension Compressor Relay

1 - Air Compressor Pump

1 - Replaced Air Suspension Compressor and Replaced Electronic Controlled Air Suspension (ECAS) Module and Replaced Rear Air Shocks

1 - Replaced Air Suspension Compressor and Replaced Rear Air Shocks

1 - Replaced Right Rear Air Spring

Confirmed Fix Details

TechReported Fix DetailsConfirmed Fix

1Jeff Conwell
August 18, 20152003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor Relay

- system would work with relay jumped. replaced relay.

Replaced Air Suspension Compressor Relay2AutoSvc04
March 11, 20152005 Hummer H2, 6.0L, V8, VIN U, USA *
Air Suspension Compressor Relay

- c0711 code. rear end on bump stops. suspension relay had continuity when switched but failed to light a sealed beam headlight. replaced relay and car is fixed.

Replaced Air Suspension Compressor Relay3Don Mousseau
March 24, 20102003 Hummer H2, 6.0L, V8, Canada *
Air Suspension Compressor Relay

- Replaced compressor relay

Replaced Air Suspension Compressor Relay

1Bill Stewart
February 26, 20112003 Hummer H2, 6.0L, V8, USA
Electronic Controlled Air Suspension (ECAS) Module
88,940 milesProgrammed Electronic Controlled Air Suspension (ECAS) Module

2George Stuyt
November 2, 20072003 GMC Yukon, Denali 6.0L, V8, Gas, VIN U, USA *
Electronic Controlled Air Suspension (ECAS) Module

- REPLACED SUSPENSION CONTROL MODULE. ALL OK

Electronic Controlled Air Suspension (ECAS) Module3Emile Dauphinais
November 25, 20142005 Hummer H2, 6.0L, V8, VIN U, USA *
Electronic Controlled Air Suspension (ECAS) Module

- ECAS module program needed

Programmed Electronic Controlled Air Suspension (ECAS) Module1Victor Briley
June 18, 20072003 Hummer H2, 6.0L, V8, USA
Air Compressor Pump

- The "SERVICE AIR SUSPENSION" lamp is always on. Rear suspension is deflated. Air compressorpump to motor bolts are sheared and pump is not working. Replaced bolts and pump now works. Cannot access module with MODIS scanner. Reffered to GM dealer for clearing of codes & calibration.

Air Compressor Pump1Tracy Vines
November 19, 20142003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor

- replaced air suspension pump assembly complete

Replaced Air Suspension Compressor1Grant Corrigan
November 29, 20092003 Hummer H2, 6.0L, V8, USA
Air Suspension Compressor
Air Suspension Compressor Relay

- Replaced 60 AMP relay taped to wire harness where steering column comes out of the body, and REPLACED the Compressor assembly and lines. These are updated parts. No programing was required.

Replaced Air Suspension Compressor and Replaced Air Suspension Compressor Relay1Irv Dueck
November 19, 20102003 GMC Yukon, Denali 6.0L, V8, Gas, VIN U, USA *
Air Suspension Compressor
Electronic Controlled Air Suspension (ECAS) Module
Rear Air Shocks

- rear shocks,compressor, and fried ecas module

Replaced Air Suspension Compressor and Replaced Electronic Controlled Air Suspension (ECAS) Module and Replaced Rear Air Shocks1
January 24, 20122004 Hummer H2, 6.0L, V8, USA *
Air Suspension Compressor
Rear Air Shocks

- Air bag blown out in left rear, Air pump motor bad

Replaced Air Suspension Compressor and Replaced Rear Air Shocks1In Gear
March 13, 20152003 Hummer H2, 6.0L, V8, USA
Right Rear Air Spring

- Right rear air spring would leak at a certain height. Dry Rotted. Replaced Air Spring

Replaced Right Rear Air Spring

- Confirmed Fix - Exact Vehicle Match- Confirmed Fix - Similar Vehicle Match*- Indicates a Similar Vehicle - Not an exact match to the vehicle selected

What Fixed It ?

Please describe what was done to fix the vehicle you were working on.
Example 1: Replaced fuel pump
Example 2: Cleaned Throttle Body

If the problem you were fixing is NOT the same as the problem described in the "Customer Concern" please use the Post Fix link to share your fix.

Still need help? Click here to access the Hotline Call Request Form to schedule a call from one of our Carline Specialists.

300 characters leftPosting Guidelines

Comments may be posted publicly with your username.

Identifix Service Manual Coverage Details New Vehicle Referral Help Logout FAQ Contact Us Privacy Policy Español Français

Copyright 2001 - 2015 Identifix, Inc. All rights reserved. Use of this online service is subject to Terms of Use