[taonupe1]

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...

 

[CadillacAsAlways]

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...

Seafoamed it?

 

[taonupe1]

Used 'Gunk' Heavy Duty Gel engine degreaser

 

[CTSUK]

if you didnt cover your electrics like ecu and such its likely water has got in remove all electrical plugs and check for dampness

 

[poncho89]

I agree with CTSUK, unplug all the connections that got exposed to water and spray either WD-40 or some wire dryer in the connections, it should help displace any moisture.
I have had this problem before with other cars when using water under the hood. Brake parts or Carburetor cleaner works real well for getting rid of grime and oil and dries instanlty without having to use water.

 

[taonupe1]

Thanks for the feedback. After checking connections, I am still having the same problem - no response at all from engine. After having battery disconneted for a while, the error code that I get now is:
U1016 - Loss of Class 2 Communication with VCM
U1016 - Loss of Communications with PCM
How do I pinpoint this problem - where is the VCM & PCM

 

[drknt03]

You must got it wet use some CRC QD Electronic Cleaner it should clean the connector and dry it out. if the problem wasn't there before you washed the engine compartment, it must just got wet.

 

[taonupe1]

Where is the VCM PCM connector located?

 

[Calgary03]

Where is the VCM PCM connector located?

It's on the passenger side, the big bracket on top of the valve cover and coil pack that's bolted to the intake plenum.

 

[taonupe1]

cleaning of the PCM/VCM completed along with Idle Learn Procedure. Same result - no clicking sound or anything when I try starting motor - tried a jump start, nothing. The only significant code I am getting now is: B1004 - Keep Alive Memory (KAM) ... What are the other possibilities? no clicking sound so I wouldn't think it iisthe CPS. Could it be the starter related ?

 

[ternstes]

Any other lights on with the key ON? The check engine light should illuminate with key ON as a self check on the ECM.

 

[CTSUK]

If the battery was not disconnected when you were washing you could have shorted out any number of electrical sensors/circuits, this is why I rarely wash the engine, if it was a carbed v8 with a couple of sensors sure but a caddy has loads of electrics, I take the engine cover off and wipe it, that's it.
I think your best bet now is to bend over and take it to the caddy dealership and hope that they use lots of lubrication when they hand you the bill.