Hi, have a 2001 xkr with restricted performance light,abs lightand asc lights on, with codes po1642 and po1638, Anybody ever have this, Possible cause ?? thank you

 

Both of those codes are CANetwork failure codes. The JTIS code list say Instrument Module or Engine Control Module. Anything else going on with the car? All sorts of things can cause a CAN failure. How is the battery? A failing battery can cause many strange issues.

After a load test on the battery I might try a hard reset of the electronics by removing the negative cable from the battery and touching it to the positive post for a couple seconds. That drains all the capacitive voltage out of the many systems and causes everything to reboot. Sorta like 'restart' on your PC.

Let us know.

. . . and welcome to the forum!

 

Thanks TP did that and put over 100 miles no codes, did those codes after having , throttle body rebuilt (TPS codes), Car runs great again, Was rebuilt by BBA remanufacturing inc, Very fast turn around and was $400.00 plus shipping pete