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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Codes in Cadillac Escalade Forums; Asked a non Cadillac garage to pull my codes and here is what he found. In no particular order. Engine ...
  1. #1
    michael tanis is offline Cadillac Owners Member
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    Codes

    Asked a non Cadillac garage to pull my codes and here is what he found. In no particular order. Engine / EVO auto ride , C0660 , exhaust valve circuit , U 1300 class 2 data link low. If this makes sense to anyone , please explain it to me. Thanks.

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    You can ignore the U code if it's necessary.

    The exhaust valve in the compressor head for the rear level control system has failed. Your leveling system can't function without it.

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    michael tanis is offline Cadillac Owners Member
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    Does that mean I need to replace the compressor?

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    MoistCabbage's Avatar
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    It's probably not worth installing a new valve solenoid on the existing compressor, if you could even find one. Arnott sells repackaged OEM units. Check their site.

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    the cadillac man's Avatar
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    Quote Originally Posted by michael tanis
    Does that mean I need to replace the compressor?
    Yes it does

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    BIG-KO is offline Cadillac Owners Member
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    Re: Codes

    Agree compressor is the culprit. But... before spending big bucks on a compressor whether GM, Arnott, or Dorman make sure everything else is good. Like all the air lines, and your rear shocks. This could all end up costing a lot of money. Weigh your options and decide if you want to keep the air/level ride system with electronic ride control or convert to a passive shock system. There are as many arguments for keeping factory as there are for converting. It's your money and your choice. Search on here what all others have done and choose what suits your needs. I personally tow a 28' camper and kept stock shocks, but disabled the electronic ride control and air compressor but added the Airlift 1000 airbags to my rear coil springs.Works wonderful for me and I have 22" rims. My setup may not work for you if you never load it heavy like I do.

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    michael tanis is offline Cadillac Owners Member
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    Well it sits fine , rides well and I don't tow anything heavy. I think I may leave it alone , for now.

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    the cadillac man's Avatar
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    Quote Originally Posted by michael tanis
    Well it sits fine , rides well and I don't tow anything heavy. I think I may leave it alone , for now.
    Word of warning the ride will suffer over time like that

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    michael tanis is offline Cadillac Owners Member
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    Well it won't start now. Something that just came up over the last 5 days. Oh well

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    the cadillac man's Avatar
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    Quote Originally Posted by michael tanis
    Well it won't start now. Something that just came up over the last 5 days. Oh well
    Check the starter relay if it clicks its the starter solenoid that's bad

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    michael tanis is offline Cadillac Owners Member
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    It only clicks once, not the normal clicking constantly.

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    the cadillac man's Avatar
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    Quote Originally Posted by michael tanis
    It only clicks once, not the normal clicking constantly.
    Relay or solenoid?

    If its the relay then replace it(or swap it with one from the lights or horn)

    If its the solenoid then the starter will need replacing

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    michael tanis is offline Cadillac Owners Member
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    Latest update. The starting issue is a drain on the battery....The alternator isn;t the problem. The main engine computer is allowing 3.4 V out on the charge control circuit (that plugs into the alternator). Either the computer is bad or you have a bad ground. I'll keep you posted.

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    michael tanis is offline Cadillac Owners Member
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    Well the repair guy says I need a new ECM. Apparently the ECM is telling the alternator to charge the battery when the truck is shut off. This leads to an open circuit and drains the battery. Does this sound correct to anyone ?

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    the cadillac man's Avatar
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    The PCM does control the alternator on its charge cycles so it sounds pretty much possible

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