Trans not shifting and codes
Thread Starter
|
New User
Joined: Feb 2003
Posts: 5
Likes: 0
Trans not shifting and codes
2001 F250 4X4 Auto, everything stock with 105,000 miles. Pulling away from a stoplight, transmission shifted into 2nd hard then 3rd hard then...nothing. This happened with overdrive off pulling a 16 foot open trailer and race car, no way the combo is over 5500# total. Limped the truck home in first, hooked up a scanner and retrieved these codes. PO732 and PO733 The transmission will not engage reverse now either. Anyone tell me what the codes tell and what is suspected with the symptomes described? Thanks for any help. Jon
Posting Guru
Joined: Jul 2003
Posts: 2,210
Likes: 2
A bad VSS can't cause these codes. These codes set because the gear ratios are wrong.
The trans is commanded to be in 2nd gear, but the ratio between the turbine speed sensor and output speed sensor (not the VSS) is not the correct ratio. Smae for the 3rd gear code.
Unfortunately these codes usually mean something mechanical has broke. It needs to come out and get torn down.
The trans is commanded to be in 2nd gear, but the ratio between the turbine speed sensor and output speed sensor (not the VSS) is not the correct ratio. Smae for the 3rd gear code.
Unfortunately these codes usually mean something mechanical has broke. It needs to come out and get torn down.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
So it's commanded to shift to second, but stays in first too long and then suddenly shifts? Or something like that?
Not to be argumentative here, just trying to learn.
Have you dealt with this, tried a VSS, and ended up pulling the trans and rebuilding?
You sound positive of your answer, and again, not trying to be argumentative, I am trying to learn how you know this with certainty.
Not to be argumentative here, just trying to learn.
Have you dealt with this, tried a VSS, and ended up pulling the trans and rebuilding?
You sound positive of your answer, and again, not trying to be argumentative, I am trying to learn how you know this with certainty.
Posting Guru
Joined: Jul 2003
Posts: 2,210
Likes: 2
It's because I know how the test works that sets those codes. It does not look at the VSS for that test, it looks at TSS and OSS. The ratio between those two is the gear ratio of the transmission.
If the code is set for 2nd gear it means that when second gear is commanded the ratio that is calculated from the TSS and OSS is not 1.53:1. It could be anything else. It could be in first, it could be in third, or it could just be slipping and not be in any recognized ratio. As long as it isn't 1.53:1 when it should be in second it will set the wrong second gear ratio.
I wouldn't replace the VSS because of these codes. I'd need to see a P0500, or see some problem with the speedo.
If the code is set for 2nd gear it means that when second gear is commanded the ratio that is calculated from the TSS and OSS is not 1.53:1. It could be anything else. It could be in first, it could be in third, or it could just be slipping and not be in any recognized ratio. As long as it isn't 1.53:1 when it should be in second it will set the wrong second gear ratio.
I wouldn't replace the VSS because of these codes. I'd need to see a P0500, or see some problem with the speedo.
Trending Topics
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Vladimier
1997 - 2003 F150
16
Sep 30, 2021 12:29 PM
rylan1
1983 - 2012 Ranger & B-Series
10
Nov 30, 2013 12:18 PM
ntty1
1997 - 2003 F150
3
Sep 14, 2011 10:31 PM
97250towtruck
1994.5 - 1997 7.3L Power Stroke Diesel
9
Apr 14, 2007 02:28 PM
