Code e048 what's the trigger?
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HT4100 4.1, 4.5, 4.9 Discussion, Code e048 what's the trigger? in Cadillac Engine Technical Discussion; '92 Eldorado 4.9. I'm getting an intermittent code e048 (egr system problem). I've read through a few posts related to ...
  1. #1
    Tony_Hanna is offline Cadillac Owners Member
    Automobile(s): '92 Eldorado TC
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    Code e048 what's the trigger?

    '92 Eldorado 4.9.
    I'm getting an intermittent code e048 (egr system problem). I've read through a few posts related to this and some possible solutions which I'll try, but I'm curious as to what actually triggers the code? Is there a sensor somewhere that measures flow through the EGR system, or is the PCM just looking at the resistance through the coil in the EGR solenoid to determine if the solenoid is functioning properly? If it's just checking the solenoid, what should the resistance be? I'd like to throw a DVOM on it to make sure the solenoid isn't on it's way out.
    Thanks,
    Tony

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    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: Code e048 what's the trigger?

    I do not know how the problem is sensored, but if you clean two EGR tubes inside the throttle body (under the blades) with a coaut hanger, the coad and SES light will be most likely gone.

  4. #3
    Tony_Hanna is offline Cadillac Owners Member
    Automobile(s): '92 Eldorado TC
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    Charleston, WV
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    Re: Code e048 what's the trigger?

    Quote Originally Posted by HUF View Post
    I do not know how the problem is sensored, but if you clean two EGR tubes inside the throttle body (under the blades) with a coaut hanger, the coad and SES light will be most likely gone.
    Thanks, I'd read that when I searched after it happened the first time. gonna give it a try this afternoon. I'd just like to know what the actual trigger is to satisfy curiosity.

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