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Transmission P0894 Challenge

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Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
Posted

Well guys, this is Ronaldo, and am here for a real challenge that drove me crazy about my transmission

and I really, really really and disparately in need for a help.

 

The Problem Statement:

My truck shifts perfectly once it is started, but after driving it for about 10 miles on highway than it would have a hard shift 2-3 and 3-4, but If I shut the engine off for one min and start it again it would shift perfectly until driving it for another 10 miles, some times it would shows "Transmission Hot"

 

 

Diagnoses Made:

 

I have connected my OBD and it showed P0894 "Transmission Component Slipping" and according to the service manual and GM TSB, it appears to be a TCC related problem.

 

What have been Done:

 

1- Changed ATF --- Problem still exists

2- Changed transmission solenoids (Force motor and the TCC PWM sol) --- Problem still exists

3- Changed the whole transmission including the TC with a guaranteed Used transmission --- Problem still exists (so i returned my original transmission)

4- Flushed the ATF cooler --- Problem still exists

 

 

Notes:

 

  • even though it shows " Transmission Hot" the cooler seems very cold, and that happen with both transmission (my original tranny and the one I bought)
  • There is no way to changed TC since it would cost me like $1000+ (this is a third world country LOL)
  • Although there are many mechanics own Tech2, but they use it as a code reader (that is what happen in a third world country LMAO)
  • I went to a stealership and they suggested to change the Trans -- which I have already did !
  • I have an online access to the service manual but i didnt helped so much (www.alldatadiy.com)
  • I have searched this forum before posting this thread

 

Guys I do really appreciate your suggestions and advice

alwcurlz Enthusiast

alwcurlz

Posted
Posted
Well guys, this is Ronaldo, and am here for a real challenge that drove me crazy about my transmission

and I really, really really and disparately in need for a help.

 

The Problem Statement:

My truck shifts perfectly once it is started, but after driving it for about 10 miles on highway than it would have a hard shift 2-3 and 3-4, but If I shut the engine off for one min and start it again it would shift perfectly until driving it for another 10 miles, some times it would shows "Transmission Hot"

 

 

Diagnoses Made:

 

I have connected my OBD and it showed P0894 "Transmission Component Slipping" and according to the service manual and GM TSB, it appears to be a TCC related problem.

 

What have been Done:

 

1- Changed ATF --- Problem still exists

2- Changed transmission solenoids (Force motor and the TCC PWM sol) --- Problem still exists

3- Changed the whole transmission including the TC with a guaranteed Used transmission --- Problem still exists (so i returned my original transmission)

4- Flushed the ATF cooler --- Problem still exists

 

 

Notes:

 

  • even though it shows " Transmission Hot" the cooler seems very cold, and that happen with both transmission (my original tranny and the one I bought)

     

  • There is no way to changed TC since it would cost me like $1000+ (this is a third world country LOL)

     

  • Although there are many mechanics own Tech2, but they use it as a code reader (that is what happen in a third world country LMAO)

     

  • I went to a stealership and they suggested to change the Trans -- which I have already did !

     

  • I have an online access to the service manual but i didnt helped so much (www.alldatadiy.com)

     

  • I have searched this forum before posting this thread

     

 

Guys I do really appreciate your suggestions and advice

 

Other info we might find helpful as well:

Did you buy the truck new or used-?

Miles on the truck when you bought it-?

Miles on the truck and driveline-?

What has the truck been used for (hauling, towing, off-roading, cruising daily driver)-?

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

shift adapts have to be reset with a tech2 anytime you change a trans componant,,none of what he says makes sense unless all that has been done and codes cleared like Aiden said ,he'll be messin around with it along time 'till he takes it to the dreaded dealer ,one repair experience doesn't go right and they label the dealer ,not a clue how shit works

 

rant#3 off

Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
  • Author
Posted
heat issue Sounds like a blocked cooler.

When you replaced the trans did you reset the Codes. It doesn't go away on its own.

 

Well, during the transmission change I have flushed the cooler with a compressed air, but still am having the 'transmission hot' message and it was on both transmissions, the original and the one I bought!!

 

I did reset the codes using three methods:

by my obd2,

I have disconnected the battery for 30 min

Using Tech2 to reset the relearn mode

and nothing worked!

 

Its really a challenge :rolleyes:

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

07 trucks have 5 yr 100,000 KM powertrain warranty in any country and the DEALER does not set the warranty duration,

 

what country ?

 

its not a challenge for a trans tech at a DEALER

Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
  • Author
Posted

Other info we might find helpful as well:

Did you buy the truck new or used-?

I Bought it new on 2007

Miles on the truck when you bought it-?

about 20 km only.

Miles on the truck and driveline-?

currently it is 95,000 Km on engine and the powertrain

What has the truck been used for (hauling, towing, off-roading, cruising daily driver)-?

Daily driver, no hauling or towing at all

 

Sorry for the blue color :rolleyes:

Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
  • Author
Posted
shift adapts have to be reset with a tech2 anytime you change a trans componant,,none of what he says makes sense unless all that has been done and codes cleared like Aiden said ,he'll be messin around with it along time 'till he takes it to the dreaded dealer ,one repair experience doesn't go right and they label the dealer ,not a clue how shit works

 

Yup i did that by a tech2 but still nothing changed, here in kuwait the dealerships are so freaking greedy and they offer only 3 yrs or 60,000 km and that was on 2007 once I bought the car, but now they offer the 100,000 km/5yrs for extra $850, but not in my case, in addition the majority of the technicians are not certified, I was talking to them regarding the TCC and they said am totally wrong the auto transmissions and torque converters have no clutches only the stick shifts have clutch!!! :P

 

My truck is the older platform GMT800, I think 100k km/5yrs warranty is not applicable for my truck

 

Thats why am here guys, I have reached my mechanical diagnosing limits :rolleyes: I need more advice guys

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

I would say wiring issue.

 

And for the record...there is no P0894 code. Don't know if that was a mistype.

P1870 is Trans Component slipping

If you are getting a true overtemp condition you should be getting a

P0218 Transmission Fluid Over Temperature Condition

 

These are your TC lock up solenoid codes.

P1833 TCC/Shift Solenoid Power Control Circuit - Low Voltage

P1834 TCC/Shift Solenoid Power Control Circuit - High Voltage

P1860 Torque Converter Clutch PWM Solenoid Circuit

P1873 Torque Converter Stator Temperature Switch Circuit Low

P1874 Torque Converter Stator Temperature Switch Circuit High

 

 

What country are you from. This could all be related to a dirty MAF with your slipping issue...and if its balls hot where you live...than the trans will get hot. You'll have to upgrade to a larger cooler.

 

Ok after reading your previous post... yes, Kuwait, definitely clean your MAF sensor. You clean it with MAF Sensor cleaner, it comes in a spray can.

 

Clean it really well and let it sit for about 30 min to dry before putting it back in.

Also...it is balls hot where you are...I was in the UAE last year and it was balls hot...so I would think that its even hotter where you are. Get a larget trans cooler.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

holy crap ,your in the shit then

 

do you access to a decription of the code and what the pcm is seeing when the code is tripped?

 

if you can wrap your head around that and you are able to duplicate it ,the scanner(tech2) will show you what is slipping

 

either the torque converter(seeing slippage with TC locked by scanner special function)

 

or 3rd or 4th gear is slipping ,

 

or maybe sensors

 

you very well have put in a used trans with the same problem,

 

as long as the cooler is clear (GM has a cool machine to flush and measure the flow rate thru the cooler for warranty purposes those numbers are recorded on the RO,

 

just get a GM rebuilt tranny ,have them flush it and check the cooler ,reset the adapts again,it'll be fine,new trannies have new sensors and TC

 

and a 3 yr warranty

Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
  • Author
Posted
I would say wiring issue.

 

And for the record...there is no P0894 code. Don't know if that was a mistype.

P1870 is Trans Component slipping

If you are getting a true overtemp condition you should be getting a

P0218 Transmission Fluid Over Temperature Condition

 

These are your TC lock up solenoid codes.

P1833 TCC/Shift Solenoid Power Control Circuit - Low Voltage

P1834 TCC/Shift Solenoid Power Control Circuit - High Voltage

P1860 Torque Converter Clutch PWM Solenoid Circuit

P1873 Torque Converter Stator Temperature Switch Circuit Low

P1874 Torque Converter Stator Temperature Switch Circuit High

 

 

What country are you from. This could all be related to a dirty MAF with your slipping issue...and if its balls hot where you live...than the trans will get hot. You'll have to upgrade to a larger cooler.

 

Ok after reading your previous post... yes, Kuwait, definitely clean your MAF sensor. You clean it with MAF Sensor cleaner, it comes in a spray can.

 

Clean it really well and let it sit for about 30 min to dry before putting it back in.

Also...it is balls hot where you are...I was in the UAE last year and it was balls hot...so I would think that its even hotter where you are. Get a larget trans cooler.

 

 

Aiden thats what am suspecting about something related to the wiring! and engine sensors.

 

Regarding the code I have seen the DTC P0894 on the service manual and it is equivalent to P1870 DTC. and I didnt get any TCC codes ever, which means the TCC is not the suspect.

 

it is really hot in kuwait but at this time of year it is nice weather about 55-70F, when I see the transmission hot message the cooler is extremely cold !!!

But I will do what you have suggested regarding MAF

 

I do really appreciate your thought guys

Pro Shade Tree Mechanic Enthusiast

Pro Shade Tree Mechanic

Posted
  • Author
Posted
holy crap ,your in the shit then

 

do you access to a decription of the code and what the pcm is seeing when the code is tripped?

 

if you can wrap your head around that and you are able to duplicate it ,the scanner(tech2) will show you what is slipping

 

either the torque converter(seeing slippage with TC locked by scanner special function)

 

or 3rd or 4th gear is slipping ,

 

or maybe sensors

 

you very well have put in a used trans with the same problem,

 

as long as the cooler is clear (GM has a cool machine to flush and measure the flow rate thru the cooler for warranty purposes those numbers are recorded on the RO,

 

just get a GM rebuilt tranny ,have them flush it and check the cooler ,reset the adapts again,it'll be fine,new trannies have new sensors and TC

 

and a 3 yr warranty

 

 

Robert, the used trans that I bought was running very well on the other truck, and the guru trans techs in my country refused to rebuild my tranny they think it is an electrical issue.

 

I has no slipping but it shifts very very hard 1-2, 2-3, 3-4. Robert I really very skeptical about going to the dealership any more (Coz we have only GM dealership in kuwait, could you imagine that?)

 

but I will try this guys and tell me what you think:

 

' Can I remove the tranny wiring harness and drive the car and shifting manually to check if the issue is electrical or mechanical?

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

no,a complete electrical failure (disconnecting or removing harness)will result in 2nd gear (both solinoids off) and reverse ,thats it

 

you need to get a schmatic and maybe check every wire up to the pcm

 

I wish I had access to GM info but not anymore since i left .GM

 

do you have an alldata account??

 

get 1

 

read the code carefully and understand it ,also the hot msg

 

I replaced a torque converter on an 80e that climbed the temp gauge carrying a quad with 200 km on the truck ,they do slip and can cause the code,like I said read the code carefully

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