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01 deville p023 p0351 computer codes help needed!!


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Hi,I have an 01 deville that's having some idling issues.When scanned all of these codes come up:

P0203 - Injector 3 Control Circuit

P0351 - Ignition Coil 1 Control Circuit

P0443 - EVAP Purge Solenoid Valve 1 Control Circuit

P0601 - Control Module Read Only Memory (ROM)

P1639 - 5 Volt Reference 2 Circuit

P1860 - TCC PWM Solenoid Circuit Electrical

P0440 - Evaporative Emission (EVAP) System

P0443 - EVAP Purge Solenoid Valve 1 Control Circuit

anyone have any ideas?

I think I need a new computer but didn't want to do that without checking with everyone 1st!

Any opinions would be greatly appreciated!!

Thankyou very much in advance!!

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Also see rough idle checklist here: http://caddyinfo.com/wordpress/?page_id=1595

Also there was an issue with the early 01 Deville for which they actually replaced the cams http://www.caddyinfo.com/howtoroughidle.htm


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Whenever a lot of codes show up, the first thing to do is to LOAD TEST the battery and check the battery connection. These cars are very sensitive to good battery current and connections

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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