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2004 TB LS 4.2 4x4 With 2" Rough Country Leveling Lift
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5 Posts
Discussion Starter · #1 ·
Hello all. The title basically sums it up. If i go to set cruise control over 40mph it will not even engage. I can set it at say 30 or 35mph and if i use the plus to increase speed once it crosses over 40mph it shuts off.

All tires are the same size with same tread left. They are oversized 245/75/16 (so just barely). Ive read quite a few post on here about cruise control but most talk about how it turns off at 70mph or so or other issues none sound similar to mine.

This is a "new" PCM for me as when i bought the vehicle the PCM failed shortly after. Could this be an issue with the PCM, does it play a large roll in the cruise control functions?

The switch buttons seem to work flawlessly at 35mph to just under 40ish mph. Just once you start creeping over 40mph it will turn its self off or if you go to set it and its above 40mph it wont engage cruise at all.

Any ideas?
 

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Registered
2004 TB LS 4.2 4x4 With 2" Rough Country Leveling Lift
Joined
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5 Posts
Discussion Starter · #2 ·
2004 Trailblazer LS with the 4.2 motor 4x4 with 192k miles
 
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