SMT PROBLEM WONT GO INTO GEAR

733 Views 34 Replies 4 Participants Last post by cyclehead, 12 h ago

Mrvictorywins

Discussion Starter · 1 mo ago

Hello everybody,

I have a 2005 SMT.

The car turns on great. When I open the driver door the pump makes a sound for about 7 seconds (which according to the forums means that the pump is good). There are no visible leaks at all. The liquid is at the right level for the pump.

It will not shift into gear. It'll stay in neutral then blink in neutral. I noticed when we push the cad it'll reverse and go into first. Once I'm in first if I try to go to second it'll work but make a horrible metal scraping noise.

there are no dash lights. A friend told me it may be a sensor issue that is not the HPU.

Does anybody have some advise as to what may be the problem and what to try fixing first?

thanks

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suoiruc

· #2 · 1 mo ago (Edited)

7 seconds is too short if it’s first thing in the morning, when opening the driver’s door. Maybe the accumulator or pressure sensor is bad. Monitor the pump: HPU/GSA- State of the units
If the accumulator ruptured, I doubt there would be enough energy to keep the clutch disengaged in neutral when the engine is running, so it’s likely not to shift into gear when the clutch is engaged. You didn’t specify whether or not the engine was running when you were able to shift into 1st and 2nd gear. Does it shift into reverse, 1st, and 2nd gear with engine off?

Mrvictorywins

Discussion Starter · #3 · 1 mo ago

suoiruc said:
7 seconds is too short if it’s first thing in the morning, when opening the driver’s door. Maybe the accumulator or pressure sensor is bad. Monitor the pump: HPU/GSA- State of the units
If the accumulator ruptured, I doubt there would be enough energy to keep the clutch disengaged in neutral when the engine is running, so it’s likely not to shift into gear when the clutch is engaged. You didn’t specify whether or not the engine was running when you were able to shift into 1st and 2nd gear. Does it shift into reverse, 1st, and 2nd gear with engine off?

yes, when we push the car, when the engine is running, is when we can get it into 1st gear. It shifts gears when the engine is off easily.

Mrvictorywins

Discussion Starter · #4 · 1 mo ago

Mrvictorywins said:
yes, when we push the car, when the engine is running, is when we can get it into 1st gear. It shifts gears when the engine is off easily.

Just double checked so I turned on my car cold start in the morning. The pump made noise for about 20 seconds. I was able to shift into reverse, 1st, and second gear no problem with the engine off.

cyclehead

· #5 · 1 mo ago

Just guessing, perhaps a bad clutch position sensor. It can be bench tested to see if it's acting correctly. Position Sensor Test and Repair
It's best to get a copy of Techstream and scan the TCU for pending or logged error codes.

Reactions: 1

triz

· #6 · 1 mo ago

Checks for leaks, as Paul mentioned the clutch sensor seems to be the one that likes to fail when it gets fluid on it.

Location?

suoiruc

· #7 · 1 mo ago

It does sound like a clutch control issue.
clutch stroke sensor >clutch solenoid >clutch >trans input speed sensor >pump

Reactions: 1

Mrvictorywins

Discussion Starter · #8 · 1 mo ago

Thank you guys for your help! I'll check it out this Saturday to see if it is the sensor!

triz

· #9 · 1 mo ago

suoiruc said:
It does sound like a clutch control issue.
clutch stroke sensor >clutch solenoid >clutch >trans input speed sensor >pump

Solenoid can also be a issue. Just had one fail on me the other day. It ended up with me removing the GSA three times.😂

Reactions: 1

Mrvictorywins

Discussion Starter · #10 · 30 d ago

Hey guys so here's a video of the noise of me trying to get into reverse. It did go into it eventually. May 6, 2023 i had a buddy use his obdII scanner and when it tried scanning the sequential M/T it said it failed to communicate. i am still unsure what can be the issue. Does this have to do with the TCU?

suoiruc

· #11 · 29 d ago (Edited)

I doubt it’s the TCU. Sounds like it’s grinding the gears pretty good and then it tries to engage again and grinds some more. The clutch is likely not disengaging fully. I’m surprised that it’ll even try to engage reverse under this condition unless maybe the input shaft speed sensor is faulty. It’s probably best to see if there’s any codes using Techstream.
Does the engine start to stall when it finally goes into gear?

Mrvictorywins

Discussion Starter · #12 · 28 d ago

suoiruc said:
I doubt it’s the TCU. Sounds like it’s grinding the gears pretty good and then it tries to engage again and grinds some more. The clutch is likely not disengaging fully. I’m surprised that it’ll even try to engage reverse under this condition unless maybe the input shaft speed sensor is faulty. It’s probably best to see if there’s any codes using Techstream.
Does the engine start to stall when it finally goes into gear?

Once it is in gear it does not stall but I remember when going into a higher gear I would just hear that crunching noise.

I will get tech stream to see if there are any codes first. Then I will check out the TCU to see if it looks fine.

I will then attempt to benchmark the clutch stroke sensor.

thank you guys for your help!

suoiruc

· #13 · 27 d ago

Mrvictorywins said:
Once it is in gear it does not stall

That probably rules out the clutch solenoid. So, clutch position sensor >dragging clutch >trans speed sensor

Mrvictorywins

Discussion Starter · #14 · 22 d ago

2

Hey Guys! So I was able to get tech stream and run it. I got two codes P0810 and P0919. From what I understand both of these codes have to do with the shift stroke control system and a clutch position control error. Does this have anything to do with the sensors?
If it is how do I access the GSA? I was able to locate the sensor plugs from the bottom of the car screenshot of the YouTube video for reference.

I am lost thanks guys a lot for helping me out!

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cyclehead

· #15 · 22 d ago

Mrvictorywins said:
Hey Guys! So I was able to get tech stream and run it. I got two codes P0810 and P0919. From what I understand both of these codes have to do with the shift stroke control system and a clutch position control error. Does this have anything to do with the sensors?
If it is how do I access the GSA? I was able to locate the sensor plugs from the bottom of the car screenshot of the YouTube video for reference.

I am lost thanks guys a lot for helping me out!
View attachment 97615 View attachment 97616

I’d assume it’s a clutch control problem, and disregard the other code for now. You can try swapping the two sensors on the bottom of the GSA and see if the problem moves.

Mrvictorywins

Discussion Starter · #16 · 22 d ago

cyclehead said:
I’d assume it’s a clutch control problem, and disregard the other code for now. You can try swapping the two sensors on the bottom of the GSA and see if the problem moves.

Okay so I will unplug the cables, then I take off the sensors and swap them. Then replug the cables. I'll let you guys know how it goes

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suoiruc

· #17 · 21 d ago (Edited)

Also check for fluid on the clutch stroke sensor and it’s wiring for damage. As Cyclehead mentioned, the shift control error may have been caused by the clutch not fully disengaging allowing the shift to occur.
Another possibility for having both codes is inadequate hydraulic pressure but swapping the sensors is a good place to start.

Mrvictorywins

Discussion Starter · #18 · 16 d ago

Hey Guys. Update: I was able to swap the sensors. When I went to turn it on it says it's in 4th gear and won't shift. I tried turning it on and it tried and shuddered off (probably since it's in 4th?).
I also tried swapping the cables as well and it did not change anything.

Do I need to program the TCU?

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cyclehead

· #19 · 16 d ago

So the problem moved from the clutch control to the shift control system? I’d try bench testing and fixing the position sensor. Position Sensor Test and Repair

triz

· #20 · 16 d ago

Check inside the GSA under the black cover. Check to see nothing has come loose there. A broken bolt will also trigger that P0919 code.

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