Suspension problem
1999 Cadillac STS V8 Front Wheel Drive Automatic 100k miles
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Hi,

I need some help. I took the 99 sts to the dealer and I was told i need a BPMV and air ride control module($3200.00 repair). So they tried to sell me a new car. Anyway I ordered a used bpmv and ebtcm from a recycler which needs to be installed. I also bought a recycled ride control mod.

My question is the car gives me code c1738 which is an exhaust solenoid valve issue. How do I correct this issu? Do I really need the ride control module replaced? I plugged it in and there was no response from the suspension. Is it likely I need a new suspension pump rather than a module? Also how do I replace the exhaust solenoid valve? Is this on the ride compressor? Is it likely the suspension shuts down due to the bpmv being out?? I would appreciate any advice.

Thanks