I have a 2000 Grand Caravan with a trouble code P0505. The dealer replaced the IAC motor and cleared the code. The light came back on the next day. I scanned the engine myself and I had the same code but did not clear the code. The light went off before I got it back to the dealer, although they saw the code they could not duplicate. When I went to pick it up the light came back on when the van was started. They now want to replace the PCM. I do not want to pay for there troublshooting mistakes if it is not the problem. It is always easy to blame the computer when the root cause of the problem is not understood. Are there any other things that need to be checked before we assume the computer is bad. Any help is appreciated
Thank You
Jim
Rick99
09-23-2008, 08:16 AM
Yes, check the wiring and connectors for a short or loose connections. Visually inspect for damage as well as using a multimeter. If it is intermittant, you may have to wiggle connectors while checking if the circuit goes open.
kiel
10-21-2008, 03:48 AM
that code is idle air control motor circuit shorted or open condition detected in one or more of idle air control motor circuit thats what tells me on my book 96 to 2000 good luck
77Utiline
10-23-2008, 05:47 PM
Get a can of fuel injection/ throttle body cleaner (like carb. cleaner but less caustic). Clean your throttle body with the cleaner just like you would a carb. that should help also.
hcmq
10-24-2008, 06:34 AM
this is the A#1 reason dealers and shops get a bad rap!
it is our job as a consumer to fix this horrible way of doing business.
first and foremost you never ever give your vehicle to a dealer/shop without first saying to them: "You MUST provide me with a documented diagnosis BEFORE I will approve any repair"
if they can't do this you MUST go somewhere that can.
ALL manufactures have extensive testing proceedures for 99% of all possible conditions/issues with your vehicle.
I could go on and on at what a mess this is but I will try not to!
it is very common for a dealer/shop to use just trouble codes to sell you parts that you dont need.
it is ok to pay the POSTED diagnosis fee (Usually around $80) as long as they provide you with WRITTEN documentations as to what they tested to come to the conclusion of what they are trying to sell you.
trust me when I tell you these vans have been around for over 20 years and the engines are old technology there IS a test proceedure/tree for EVERYTHING. if your dealer cant follow what the manufacturer shop manual tells them what to do for said condition take it to someone that can!
bottom line is that it is very unlikely that it is a computer problem and most likely what someone stated earlier and it is a short.
shorts are very common on these vans.
good luck and let us know how it goes!
77Utiline
10-24-2008, 02:03 PM
Also ask for the old parts back. In WA shops are required to return ANYTHING that has r&r'd (removed and replaced) back to th customer down to a broken spark plug. I don't know how the laws are where you're at but up here if items aren't returned you do have grounds for a lawsuit. Additionally if they do / don't then you know if it has been done or not.
