getting code c 0660 for exhaust valve circuit fault. Would this pertain to the solenoid itself or the control module that operates it. I just installed a new compressor/and solenoid assembly less than two months ago. vehicle is 04 Denali with 77k and autoride w aoto level. I replaced the rear oem shocks with new oem units, due to one that was leaking.
Year : 2004Make : GMCModel : DenaliEngine : 6.0L
replacd compressor as well as rear shocks due to leaky air bag. System was operating normally prior to new shocks, but compressor would run a lot due to leak. Installed new shocks and the system aired up with no leaks, but now service autoride on dash is displayed and shop shows a c 0660 on scanner.
Checked both the blue and orange wire going to the exhaust solenoid. Orange is 12 v constant, and blue is constant ground. This is incorrect right? The blue should only be showing ground when the system is letting air out? Not sure why this problem never showed up unitl the same day that i replaced the rear shocks. How could the new shocks affect the system and generate these fault codes? also there are five major harnesses on the passenger side. what would i be looking for there? where is the Suspension Control Module so that i can trace this blue wire there to see if and where its grounding out at? Thanks
traced the dk blue wire all the way to the control module. It is not grounding out anywhere. It only has a ground signal when i plug in the c2 pink connector back into the module. So the module is throwing ground down this line. I do have the service autoride light still on the dash. Do i need to reset the codes and try again? so atleast ive ruled out wiring as the issue. Ive heard in other forums i may need my module to be recalibrated/updated by the dealer. Is this possible after putting in the new shocks. I was told the shock are a revised model from the factory from the original '04 units. Wondering if a simple recalibration will fix the isse of the module leaving the exhause vale open constant. Thanks!!
yes c0660 is the only code that the shop told me. I dont think it is level sensors since i never got this code before the rear shocks were installed, but i gues you never know. is it more than likely that the module has gone bad?
I've been working with American made cars since 1992.
what do you mean vent solenoid resistance, how am i testing for this? i did test the solenoid resistance at 26 ohms
the module is sending ground out of the blue wire at all times. the mechanic cant even reset the c0660 code, it comes right back on immediately.
I was using my multimeter with a 12v lead and the blue wire is constant ground. As soon as I unplug the harness from the module there is no ground present on that blue wire. So I definitely think there is no possibility of it being grounded out somewhere else. weird coincidence that this is being triggered after the shock install. Literally right after.
My multimeter shows 12 volts when across the orange wire and blue wire. just as it does across the orange wire and chassis ground
So you think that my meter might be getting a weak ground signal from the blue wire, enough to read a normal 12 volts, but not enough to normally operate the solenoid. Im really am hoping that the exhaust valve solenoid is the casue of the problem since i recently purchased it and will be able to have a replacement sent for no charge. Thanks. I will check with a test light in the am.
i will use the test light shortly to double check for a faulty control wire circuit from the control module . I removed the compressor and exhaust valve assembly for bench testing. Compressor works fine when 12 v applied. When i apply 12v and ground to exhaut valve i hear nothing. Shouldnt i be able to hear that switch clicking the valve open and closed?
i will also check resistance again to make sure my readings were correct. i should get some continuity through the exhaust valve correct?
i should still get a reading even though the lowest setting on my meter is 2000 ohms correct?, i am getting nothing right now.
my meter is a cheaper protek, lowest setting is 2000. the shop said they got 26 ohms yesterday on their meter. but even on the 2000 setting it should still read atleast .00xx
it is a protek d-906 and the only settings for ohms is 2000 and 2000k. yes and checking it myself has no reading. when i check resistance with the same meter on other components, i do get a reading.
im getting no reading from metering the test lamp. the meter stays showing 1
I checked the wire with a test light, the light is very weak, with key on. Using a chassis ground the light is full brightness from the orange wire. So you are right, there is not a true ground being sent out down the blue wire from the module. I am having a replacement compressor/vent solenoid assembly sent out right now and should have it thursday. hopefully that fixes the issue. I will get back on and let you know thursday what the outcome is. Thanks!
got the compressor with vent solenoid, check ohms with my meter frist and read18 ohms. So my meter is able to read it fine, it was just a bad solenoid after all. Thanks for the help, and im definitely glad it wasnt a bad module.
the solenoid was two months old and was aftermarket with the compressor from Arnott Industries in FL, USA