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Smartass
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Discussion Starter #1
So I'm 500 miles away from home and the check engine light comes on. I find the code to be "P0732-GEAR RATIO ERROR IN 2ND."
I'm trying to find out if I should be worried. I will be bringing the truck in to be serviced once home but that won't be for a week.
What does happen each morning once the truck is started is as follows: Shift into drive and try to accelerate but the engine revs up to 2500rpm before actually moving. If I apply the brakes the truck surges forward and stalls as if its in 2nd or 3rd gear and the clutch is still engaged. Its strange because its an automatic tranny. I'll restart the truck and all is well. For the rest of the day it'll run great as long as it doesn't sit for more that a couple of hours.
I had brought it to the dealer about a month ago for this problem but they did nothing except look at me kinda strange.

Any ideas of what the problem could be?? :confused013:

Thanks, guys!
 

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Premium Member
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Here is the info on the code.

P0732 DescriptionThis diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (2nd) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shiftingPossible Causes- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuitWhen is the code detected?P0732 is detected when A/T cannot be shifted to the 2nd gear position even if electrical circuit is good.Tech NotesStart by inspecting the transmission fluid level and condition, and change fluid if necessary.
 

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Smartass
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44 Posts
Discussion Starter #3
Interesting! Thanks!
I checked the fluid level and its Ok. Color is a nice pink. Only has 5,000 miles on it anyway. I have been towing the past two weeks and generally it's been flawless. Towing a fifth wheel thats well below the max. rating. I guess I'll know more once back home...

Thanks again!
 

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TECH SPECIALIST
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3,848 Posts
The morning startup behavior sounds like you're getting converter drainback. Does it do this consistently, and only when started up cold?

Does it feel like it "oozes" slowly into gear (when started cold)? If you start it, and let it idle in Park for 30 seconds or so, does it then run OK (no weird behavior)? If so, then I'd say drainback is your problem. Oil from the converter is draining back into the sump when it sits for ~8 hours or so. When you start it, the converter is half full of air (which doesn't transmit torque very well!). You feel the "oozing" into gear because the torque slowly increases as the converter fills back up. If you start it and let it idle in Park, the converter will refill while in Park, so then when you shift into gear all is fine. The surge / stall behavior is also likely related to drainback: That slug of air in the converter gets pumped out through the cooler, and when it comes back to the pump (some several seconds after you start it) you momentarily lose line pressure, which causes residual pressure in the converter to drag the torque converter clutch (TCC); i.e. it tries to lock the converter briefly.

Ask your dealer to check both transmission filters (the main sump filter and the spin-on filter) visually, and to make sure they are installed correctly. If the filters look OK, replace the spin-on filter. Yours may have a weak or defective anti-drainback valve (internal). Hopefully, this will fix your drainback issue.

The P0732 (2nd gear ratio error) is NOT normally associated with drainback, so that may be a separate issue. But let's fix the drainback first and make sure that's out of the way, so it doesn't cloud the P0732 issue. Have you only had this fault (and check engine light) once, or does it recur? Please post again or PM me if you continue to generate a P0732 fault after fixing the drainback. I can give you a more detailed list of possible causes, and some tips to help you and your dealer to diagnose it.
 

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Smartass
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44 Posts
Discussion Starter #5 (Edited)
TransEngineer,
Yes to the first question. Generally it always happens when cold. It didn't when I first got it but about a month after was when I noticed it. It disappeared for about a week and now it is pretty consistent. I just now went out and did what you suggested namely start it and let it sit in park and idle for about 30 seconds. It didn't do what I mentioned before. I'm going to try it out for a couple of more days and see what develops. Monday I'll bring it to the dealership for them to check out. I'll let all know what happens.

The P0732 code only happened this one time but considering how it has been acting I thought it may be related.

Thanks!
 

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Smartass
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44 Posts
Discussion Starter #6 (Edited)
Finally got the truck in the shop. Will let you know what they say/find. I did talk with their tranny specialist and he sounds like he knows what he's talking about. He mentioned pretty much what was said here.
Here's hoping!
 

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Smartass
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44 Posts
Discussion Starter #7
Transengineer,
Appears you got'r right. Got a phone call yesterday from the tranny specialist and he agrees with you. The parts are on back order so it may be a few days before it gets repaired. They've ordered the filter kits too.
I'm wondering if this is becoming a problem considering that the parts are on back order? Are they replacing quite a few or is the part being upgraded to repair the defect?
Just wondering...
 

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Premium Member
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515 Posts
I had this same problem at 3800 miles on my 2010 3500. I'm now sitting in Massachusetts at just over 17000 miles waiting for an ATS tranny to arrive. Diagnosis from the dealer today, transmission is burned up.

And surprise, surprise, my hometown dealer voided my warranty before I ever had a warranty problem because I added an Edge to the truck. Didn't tell me, no letter, no notice until I went to the dealer here in Massachusetts and they told me. I'm waiting for my ATS tranny to be delivered and installed before I can head back to Wyoming. I've never raced or abused my truck, I use it for towing and hauling gear.
 

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TECH SPECIALIST
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.... The parts are on back order so it may be a few days before it gets repaired. They've ordered the filter kits too.
I'm wondering if this is becoming a problem considering that the parts are on back order? Are they replacing quite a few or is the part being upgraded to repair the defect?
Just wondering...
Parts wind up on backorder for a variety of reasons.... usually, it seems to be because I need one!!

Actually, I see two main reasons for backorder situations: either a spike in demand (often due to a quality problem in a batch of production parts), or because Mopar screwed up and didn't order enough (or any!) parts. For example, they switch to a new supplier for a certain parts kit, so they cancel the orders for the old supplier, but then they forget to order any parts from the new supplier!
 

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Code P0732

Was down at Florence,OR over the weekend was pulling my buddies Ford F-250 out of the sand my check engine light came on I stopped had some smoke from under the hood checked it out some tranny fluid came out the dip stick tube on to the turbo. I let it cool down cleared the code now my truck will not move drive or reverse had to towed home $522 later. Any buddy had a similar problem??
 

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TECH SPECIALIST
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3,848 Posts
No drive or reverse? Even after restarting it? Best bet is to take it to a dealer or trans shop that can read Line Pressure and the various speed sensors using a scan tool. Check Line Pressure in Park and see if it matches Desired Line Pressure. If LP is OK, check engine, turbine (trans input) and output speeds in Drive and/or Reverse. If output speed is zero but turbine speed is higher than zero, the trans is slipping internally. If both turbine and output speeds are greater than zero (at a stop), then either transfer case is in Neutral (or broken) or you have broken axle gears, etc. If both turbine and output speeds are zero, then you have a flexplate / converter failure, or a stuck TCC switch valve in the pump (which causes no oil to be fed to the converter).

The smoke-and-trans-fluid-out-the-dipstick symptom usually means a fried clutch, but there is no single clutch that can go bad and give you BOTH no drive AND no reverse. So I'm thinking you either lost all your line pressure (bad filter or stuck regulator valve, usually), or maybe you fried the LR clutch AND broke your overrunning clutch. Both of those are at the very back of the trans, so you'd have to pull the trans and tear it all the way down to replace them. A new LR clutch pack, and a new overrunning clutch, will cost you about $450 for the parts (including new fluid and filters). But you also have a big labor bill for pulling the trans and tearing it down. Sorry for the bad news!
 

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Just got home from a 300 mile road trip pulling the 5th wheel and My truck started the same things about half way home. now showing a check engine light and trouble codes P0732 Gear 2 Incorrect ratio and P0868 Transmission Fluid Pressure Low. Only has 45000 miles and the fluid and filters were changed at 40000. First problems with the tranny. Any help?
 

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68 RFE in a 2008 2500 4x4 6.7L deisel. Found out that the spin on filter I used doesnt have the drainback feature like the original had so im hoping its just a filter issue.
 
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