- Mar 14, 2007
2002 Chevy S10 pickup. ZR2 123,000 I took my scan tool (Actron CP 9580A) and cleared the codes. I hopped in the truck today and drove about 20 miles. No lights at all. I was parked about 20 minutes. I came out, started the truck and the ABS and brake light were both on. I was running some errands. Sometimes it would come on when I started it but, not every time. I got home and checked the code. It was CO 238. Wheel speed mismatch. The frequently reported fix from the scan tool is to "program the PCM". According to the tool, a frequently reported fix is as likely a fix as any other. Since I don't have a Tech 2, I need to eliminate all other possibilities first. The tires are new and factory sized 31 x 10.50. Have you guys come across this before?