Air suspension pumps slowly

No. This is basically telling you that the electronic portion of the suspension system has a fault. All the basic mechanical items will still work as normal. It is common on those truck to have the Auto Ride pump go bad for the air suspension in the rear.

Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .

The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.

Sounds like vent tube or vapor canister is plugged. Try compressed air into vent tube. If that doesn't cure, vapor canister filter is plugged.

It is the air shocks suspension on the rear.
When weight is added to the rear of the vehicle the ride control pump pumps up the shocks.

Should be located on the outside of the frame rail just below the fuel filler neck.

you need to tighten the cable that comes from the odometer to the drivetrain ... they sometimes become loose from vibration... this should fix it...



good luck

check level in coolant system -fans for proper function & air flow--radiator out side for blockage internal clogging and water pump proper function belt tight good luck

the leak almost 100% of the time is in the air bags of the shocks, there are special tools for isolating the individual shocks and seeing if they leak, but as far as the home repair goes u just replace them or have the dealer test them.

it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you

the only way to know is to call gm and if they have not changed anything on this unit it would be ok if they did not then you can not use the gm parts dept can tell you this immediatley as soon as they look it up/ Please rate my response thank you very much