How do I tow a 2004 xj8 with a fault that reads vehicle too low

your car i think will be the xj350 all alloy car with air suspension. the normal cause of this problem is one of the level sensors on the front and/or rear or the little straps that retain the link rods for the sensor atached to the suspension arm broken off

The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling, and loading conditions.
The system uses the electronic suspension control module (ESCM), ALC relay, ALC compressor assembly, air dryer, air lines, LR and RR shock absorbers with integral air chambers, LR and RR suspension position sensors, exhaust valve, driver information center (DIC), and the serial data circuit to perform the system functions.
What switch ? there are sensors at the wheels that control the system .
The system uses the automatic level control module (ALCM) with integral suspension position sensor, ALC relay, ALC compressor assembly, air dryer, air lines, LR and RR shock absorbers with integral air chambers, exhaust valve, driver information center (DIC), and the serial data circuit to perform the system functions.

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u can get code from most auto stores they offer free scanning but before bringing in check fuse -and power connection at compressor for power if compressor checks out fine look at the air lines to bags for breakage or disconnection -same goes for the bags

These are the types of problems that are caused when modifications are made to a vehicle - especially the newer models where everything is computer-controlled and several computers in the vehicle are networked together and share information with each other. Disabling one will make the next one start sounding the alarm, turning on warning lamps or and/or setting fault codes.

The only recommendation that I have is this:

If you do not want to have to REPAIR an air suspension system, DO NOT BUY a vehicle that is equipped with air suspension.
If you already own a vehicle equipped with air suspension and it breaks, either repair it properly, or trade the vehicle off. You probably cannot even GIVE the vehicle away once modifications are attempted. NOBODY will want it.

Making modifications in an attempt to get around making proper repairs usually CAUSES more problems than it fixes.

Many things will cause the air fault to come on...I have yet to ever see the retention tank ever needing to be replaced...But if or when it was installed the neg battery terminal should have been disconnected always.I assume the code c2302..Under the hood is a relay #4 on the passenger side ..check it and make sure the fuse is good.Second,the system has parameters in the air suspension module with regards to the time for compressor to fill the reservoir.
Something like 3 minutes to hit 14.4 bar. If it takes longer, the asm will store code C2302. Easy to diagnose. C2303 is more of a problem as it is for air leak. If you come out and see the car sitting on the ground, you may want to tow it. As long as suspension is up, ok to drive. Either way, take it in soon .

the only thing will cause the fault light to come on is the pressure in the retention tank located in the trunk underneath the spare tire...,once the pressure drops,then the suspension pump relay makes the pump refil the tank...the cause of this is usually a leaking shock...normally they will leak around the upper caping...one sign is that the car will be lower overnite then normal or if it sits for a long period.if the front is lower then its a front shock..the bumpy ride is the fault system lowering the car from the leak while your riding..

if your in doubt about the functionality of the suspension system a quick way to check and see if the static pressure system is working properly is totake a floor jack and raise up the opposing side that you have questions..The system stores 228ps in the retantion tank located under the spare tire.As you force the air to one side the recycle valve will release the air to lower the cars' body.You wil hear it come out,then lower the jack,then the air from the tank will refill the lost air....Turn on the car to initiate the air pump to refill the rear tank,you should feel the car raise up in the front evenly.Last but not least my suggestion is if you think another shock is leaking you can 1st check the caping on the shocks...at times they will leak slowly on the caping...it will start as a weeping leak and you cant hear it....you can get some soapy water and lightly spray it around the enter deck mounts location under the hood where the air lines feed into the shocks...if you see air bubbles,then you can easily pack a towel in the leakage until you find a used shock or rebuilt one off ebay....But you fault light wont display a mil.The fault light only comes on when pressure is lost from the shock,or a static line has failed...causing one shock to lower to be lower..The CAN will trigure a fault code as the sensor detects body uneveness..Usually when this happens you will see a fault code,but I doubt this is your issue.

do you hear the pump running from under the back of the car? check fuses? is the suspension light on in the dash? this system is diagnosable with the right tester.have someone get the fault code from the suspension module. could be as easy as a sensor. was the car towed recently? flat beds ofter knock off the sensors when car gets tied down. my air suspension went out on me. And the dealers price was too expensive and i went to Strutmasters.com and bought a conversion kit that eliminated the air and has a lifetime warranty so now i don't have to worry about it ever again. Prior to jacking or lifting a vehicle with air suspension, you must turn off the suspension switch. find the reset switch auto parts store will tell you where its at

Hi!

Your vehicle is equiped with a small compressor that pumps air into either a bag or shock absorber, each one has a leveling mechanism that sends the signal to pump more air to that particular side. This keeps your vehicle leveled at all times, like when you have passangers in the back sit, passenger sit, or luggage.

The message you are getting means that either the air is not getting to the front passenger suspension to level it up, which could be due to an air leak, or the bag or the part of the suspension that lifts that part of the vehicle is defective.

You can get a diagnostic at any reputable suspension shop at no charge to find out the exact cause.

Good Luck!! Don't forget to rate this post!!