Crank no start 2002 chevyvtrailblazer LS 4wd

Question

Codes co237 and co281. I have changed the starter, plugs, ignition switch, fuel filter. Started after each one then same thing the next day

Answer 1

Neither of the items you replace is for the codes you got. For the C0237 code the most likely cause is the Vehicle Speed Sensor and for the C0281 the problem is the Brake Light Switch.

C0281 CHEVROLET - EBCM Detects Open Or Shorted Brake Switch Or Circuit
Read more: https://www.autocodes.com/c0281_chevrolet.html

C0237 CHEVROLET - Erratic Rear Speed Signal
Read more: https://www.autocodes.com/c0237_chevrolet.html