1997 Jimmy Transmission problem please help!!!

[quote:62b687518d="dbrown23"]I have a 1997 jimmy with 175000 miles on it, and the service engine soon light came on, and it is giving the code p0785. which means shift solenoid malfunction. I need to repair it myself due to money, please, which solenoid is it inside the pan? is it something i can do myself. the transmission will not shift into fourth or first gear when the light is on, the light only comes on when the engine is almost up to temp. please help!


made a donation!![/quote:62b687518d]

Try disconnecting the TCC solenoid and see what happpens.

[quote:c7327f4015="rasmataz"][quote:c7327f4015="dbrown23"]I have a 1997 jimmy with 175000 miles on it, and the service engine soon light came on, and it is giving the code p0785. which means shift solenoid malfunction. I need to repair it myself due to money, please, which solenoid is it inside the pan? is it something i can do myself. the transmission will not shift into fourth or first gear when the light is on, the light only comes on when the engine is almost up to temp. please help!


made a donation!![/quote:c7327f4015]

Try disconnecting the TCC solenoid and see what happpens.[/quote:c7327f4015]

I was doing some more research on this problem, and i found that GM put out a TSB about this issue stating that it was the ignition switch that was not sending the right voltage to the transmission causing the solenoid to stick in 3rd gear....does this make any sense at all?? also, would this be something that GM would pay for sense they sent out this TSB??????

P0785 Shift/Timing Solenoid Malfunction. I've looked it up nothing relates to this code on TSB/Recall- It came up with P0756/P0757

This code could be set by electrical problems with the wiring harness or poor electrical connections

Posted: Sat Aug 25, 2007 2:59 pm Post subject: 1997 Jimmy Transmission problem please help!!!

--------------------------------------------------------------------------------

I have a 1997 jimmy with 175000 miles on it, and the service engine soon light came on, and it is giving the code p0785. which means shift solenoid malfunction. I need to repair it myself due to money, please, which solenoid is it inside the pan? is it something i can do myself. the transmission will not shift into fourth or first gear when the light is on, the light only comes on when the engine is almost up to temp. please help!

I don't think its coming from the ignition switch- You can check these sensors whether they are working correctly-coolant temperature sensor/throttle position sensor/vehicle speed sensor and brake signal.the computer uses these signals to command the shifting solenoids/lock-up

Could be chips/debris clogging an orifice for the 1/4 shift valves.

Malfunction Indicator Lamp (MIL) On, Transmission Stuck in Second or Third Gear, Instrumend Cluster Inoperative (Replace Ignition Switch) #01-07-30-002D - (Oct 19, 2004)

2004-2005 Buick Rainier

1999-2000 Cadillac Escalade

2002-2005 Cadillac Escalade, Escalade EXT

2003-2005 Cadillac ESV

1997-1999 Chevrolet Full-Size Pickup, Suburban, Tahoe (Old Style)

1997-2005 Chevrolet Blazer, Corvette, Express, S-10

1999-2005 Chevrolet Silverado (New Style)

1999-2005 Chevrolet Blazer RH Drive (Export)

2000-2005 Chevrolet Suburban, Tahoe

2002-2005 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT

2004-2005 Chevrolet Colorado

1997-1999 GMC Sierra, Suburban, Yukon (Old Style)

1997-2001 GMC Jimmy

1997-2005 GMC Savana, Sonoma

1999-2005 GMC Sierra (New Style)

2000-2005 GMC Yukon, Yukon XL

2002-2005 GMC Envoy, Envoy XL

2004-2005 GMC Canyon, Envoy XUV

1997-2004 Oldsmobile Bravada

2004-2005 Pontiac GTO

2003-2005 HUMMER H2

with 4L60-E, 4L65-E, 4L80-E or 4L85-E Automatic Transmission (RPOs M30, M32, M33, MT1, MN8)

This bulletin is being revised to update model years, add additional models and 4L80/85 Transmission Information. Please discard Corporate Bulletin Number 01-07-30-002C (Section 07 -- Transmission/Transaxle).

Condition

Some customers may comment on one or more of the following conditions:

* The Malfunction Indicator Lamp (MIL) is ON.
* The transmission is defaulted to second gear (4L80/85-E).
* The transmission is defaulted to third gear (4L60/65-E).
* The instrument cluster is inoperative.

Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764 and P2769 may be set depending on the vehicle.

Cause

The most likely cause of this condition may be a loss of voltage to the transmission on circuit 1020. This loss of power may be caused by an open in the ignition switch. This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system.

Correction

With the ignition switch in the RUN position, test for battery voltage at the IGN 0 fuse (All Av's to date).

If battery voltage is present at the fuse, inspect the ignition voltage circuit between the fuse and the transmission for possible opens. If battery voltage is not present at the fuse, replace the ignition switch using the Ignition Switch Replacement procedure in the Steering Wheel and Column sub-section of the applicable Service Manual. Refer to group number 2.188 of the parts catalog for part description and usage.

If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse listed above is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of voltage at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections.


[quote:48010a4ab0="rasmataz"]P0785 Shift/Timing Solenoid Malfunction. I've looked it up nothing relates to this code on TSB/Recall- It came up with P0756/P0757

This code could be set by electrical problems with the wiring harness or poor electrical connections

Posted: Sat Aug 25, 2007 2:59 pm Post subject: 1997 Jimmy Transmission problem please help!!!

--------------------------------------------------------------------------------

I have a 1997 jimmy with 175000 miles on it, and the service engine soon light came on, and it is giving the code p0785. which means shift solenoid malfunction. I need to repair it myself due to money, please, which solenoid is it inside the pan? is it something i can do myself. the transmission will not shift into fourth or first gear when the light is on, the light only comes on when the engine is almost up to temp. please help!

I don't think its coming from the ignition switch- You can check these sensors whether they are working correctly-coolant temperature sensor/throttle position sensor/vehicle speed sensor and brake signal.the computer uses these signals to command the shifting solenoids/lock-up

Could be chips/debris clogging an orifice for the 1/4 shift valves.[/quote:48010a4ab0]

There is no record of your donation for some reason.

DBrown. Where did you get this TSB report? I would love to find a copy of it. My '98 Olds Bravada stuck in 3rd gear and looks like ignition failure described, however GM cannot find my car on their TSB 01-07-30-002D you posted. They have updates there's is same number but dated 2005, not 2004 and don't show many of the year/models you have listed. Unfortunately mine is one of them. Did you download it online? Do you know if their was a suit that updated it from bulletin to safety recall? They dismiss me as soon as they look and see no active recalls on my car VIN. Thanks for any help you can offer.