2003 CTS will not start after cleaning engine

taonupe1 said:

Help Needed

My 2003 Cadilac CTS with over 235k miles will not start after cleaning engine with engine cleaner and rinsing with hose to remove some oil from valve cover gasket leak. After cleaning I started car successfully and ran for about 20 minutes. The next day - nothing, all lights and panel come on but engine does nothing. Checked codes and came up with:

P0850 Park/Neutral Switch Input Circ
P0616 Starter Relay Circ Lo
P0128- Coolant Temp below Thermostat
U1000

After reading the forum I tried putting the car in Netural - same response
I have currently disconnected the battery

I'm sure my brillant cleaning effort was not a wise course of action, lesson learned.

Any guidance appreciated...

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