Check engine light


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Old 09-14-09, 03:41 PM
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Check engine light

Hi all, Our 2005 grand caravan's engine light came on a few times. The owner's manual says loose gas cap or poor quality fuel for this light. My backyard fix was to put premium fuel in and disconnect and reconnect the battery.This apparently resets it. This works until we put regular gas back in. Then the light will come back on. Any ideas what might be going bad?
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Old 09-14-09, 05:26 PM
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Have you replaced the gas cap? They can go bad (poor seal) and cause light to come on.
 
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Old 09-14-09, 06:12 PM
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your check engine light can come on for many more reasons than just a gas cap or poor fuel quality. I doubt poor gas is to blame if get gas from a normal gas station. A gas cap could be the cause but I would go to a parts store and get your computer read for a data trouble code. Disconnecting the batt resets your computer, but if the problem is still there your pcm should set the code again
 
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Old 09-15-09, 03:54 AM
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How long would it normally take for the pcm to set that code again? The light first came on while on vacation(of course) at the beginning of Aug. I put some good gas in and reset it and it hasn't been on again until a couple of days ago. Can you have the gas cap tested?
 
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Old 09-15-09, 04:48 AM
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I second GMTech's suggestion; get the codes read. Until you do that you are guessing. There are dozens of reasons the light could be on and the gas cap is only one.

Also, disconnecting the battery on an OBD-II vehicle will not clear the codes.
 
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Old 09-15-09, 06:20 PM
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Ok, will do. Thanks for the advice. Will some auto parts stores do it for free?
 
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Old 09-16-09, 04:08 AM
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They still do around here, but I understand not everyone does anymore.
 
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Old 09-16-09, 07:24 PM
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Originally Posted by pumpguy View Post
Ok, will do. Thanks for the advice. Will some auto parts stores do it for free?
I think Auto Zone will do it for free. Get the codes read and erased too. Sounds like a new gas cap is needed.
 
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Old 09-19-09, 05:23 PM
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code read

Went to Auto Zone and had the code read today.here is what it said.
EGR temperature sensor circuit high input
Probable causes:
open or short circuit condition
poor electrical connection
egr valve malfunction
failed egr position sensor
failed egr pressure sensor
Any of these jump out as the thing that is usually wrong when this code is shown?
Thanks
 
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Old 09-20-09, 05:55 PM
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Originally Posted by pumpguy View Post
Went to Auto Zone and had the code read today.here is what it said.
EGR temperature sensor circuit high input
Probable causes:
open or short circuit condition
poor electrical connection
egr valve malfunction
failed egr position sensor
failed egr pressure sensor
Any of these jump out as the thing that is usually wrong when this code is shown?
Thanks
Do this gas cap fix first. It's cheap and easy. Then have the codes cleared to see if the light stays off. If your EGR system was not working, the emissions from the exhaust would be really high. Check all the connections electrical in the erg system. After that, you might need one of those two sensors replaced. Do you have the manual for the van?? You can test these sensors with a multi-meter. Ohms and continuity can be checked.
 
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Old 09-29-09, 03:17 PM
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Tried a new gas cap, disconnected the battery to reset and the light stayed off for about 20 miles and came back on. Does the battery thing erase the code? Auto zone said he couldn't erase the code and suggested the battery thing. Are the code readers pretty accurate? The EGR valve for my van looks like it comes as an assembly. Would this have all of the sensors on it that could be causing the problem? It has a large electrical plug on top.
Thanks
 
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Old 10-09-09, 05:35 PM
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Put a new EGR valve in and so far so good-no light.
 
 

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