Trying to find out what code P0443 means

[LarryA]

This is my first post so go easy on me....I have a 2000 C5 with a highly modified LS1..ALSO HAS A PS1 SUPERCHARGER..Car has been a beast until lately....It started out as an occasional problem...now it is full time....The reduced power message comes on and I have no control over the throttle body....only runs for a short time...yesterday I pulled the codes and came up with P0443 which I could not find any informationon on.....I also had code P1518 (PCM to TAC Module serial data circuit).....Ran the codes again today and came up with P0158 (HO2 sensor circuit high voltage bank2 sensor2) (which i think could be because of the reduced power)...but no P1518....What happened? Does this point to the PCM ? I also had a Traction Control system code C1278 (TCS temporally inhibited by PCM) this seems to point to the computer but hopefully not.. Thanks, Larry

My fuel pressure is 60+lbs.....normal for this car.....I also installed an optima red top battery ....I'm going to drop the right front filler and check out what the PCM looks like and see if I have any corrosion issues.....

 

[timfitz63]

Welcome!

Here's a site that covers that code: OBD-II Trouble Code: P0443 Evaporative Emission Control System Purge Control Valve Circuit.

One of the C5 gurus should check in shortly to help you with solutions.