No downshift no noise it runs fine?

Tiny
CASTAWAY52
  • MEMBER
  • 2003 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 154,000 MILES
The trans shift in all gears with no problem it smooth, no noise it runs fine, the problem when I give it gas to say trying to pass or going up a hill it won't downshift to gain speed. Besides that the engine runs well no erratic idle or stalling, it runs like it should. Suggestion? Thanks.
Sunday, July 13th, 2025 AT 4:58 AM

4 Replies

Tiny
CASTAWAY52
  • MEMBER
  • 16 POSTS
I went out and installed my scanner on it.
P101 MAF circuit range 1.
P102 MAF A circuit low.
P0758 Shift solenoid B electrical (present and pending).
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Sunday, July 13th, 2025 AT 8:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
I have seen the TPS sensor cause this issue but most of the time there will be a code. Since you have a code for the Shift solenoid, but we should swap it out, here is the location of the solenoid, it has a red/blk and ltblu/wht wire going to it. This is a the pressure control solenoid so it will definitely control the downshift. You must replace the pressure manual valve position switch as well; I have marked them below. Check out the images (below). Let us know how it goes. Please start a new thread for the MAF sensor issues.
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Sunday, July 13th, 2025 AT 1:21 PM
Tiny
CASTAWAY52
  • MEMBER
  • 16 POSTS
Was thinking the same also. If I have to get into it, I am going to order a GM kit with all the solenoid wiring harness etc. Get it done in one job. Thanks.
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Monday, July 14th, 2025 AT 4:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Good call, that should fix it, please let me know.
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Monday, July 14th, 2025 AT 7:51 AM

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