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shift into 2nd.. weird shift, Like it hesitates /


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#1 Taaaaaaahoe?

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Posted 25 April 2006 - 03:35 PM

http://www.gm-trucks...showtopic=51763

Can someone help. is this an PCM Flash?

Mike
2003 Tahoe LS 4X4
6.0 HO Lq9, Custom Tune, Gibson Headers, Magnaflow Exhaust

#2 ChevyTech007

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Posted 25 April 2006 - 08:44 PM

Subject: Transmission Has a Harsh 1-2 Shift, Slipping 1-2 Shift Followed by a Harsh Engagement (Replace Pressure Control Solenoid and Reprogram PCM on Certain Models) #03-07-30-020D - (05/05/2005)



Models: 2003 Cadillac Escalade

2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003 GMC Sierra, Yukon, Yukon XL

with 4.8L or 5.3L V8 Engine and 4L60-E Automatic Transmission (RPO M30)




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This bulletin is being revised to replace labor code K5364 with labor code J6355. Please discard Corporate Bulletin Number 03-07-30-020D (Section 07 -- Transmission/Transaxle).


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Condition
Some customers may comment on a harsh 1-2 shift, 1-2 slip shift that has a bump feeling when 2nd gear engages.

Correction
For 2003 model year vehicles produced prior to April 1, 2003, replace the Pressure Control Solenoid (PCS). Refer to the Control and Shift Solenoid Replacement procedure in the Transmission sub-section of the Service Manual (SI Document ID #825149). Also, reprogram the Powertrain Control Module (PCM).

For 2003 model year vehicles produced on or after April 1, 2003, reprogram the Powertrain Control Module (PCM).

Parts Information
Part Number
Description

24230632
Solenoid, pressure Control


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

FOR 2003 MODEL YEAR VEHICLES PRODUCED PRIOR TO APRIL 1, 2003
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#3 ChevyTech007

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Posted 25 April 2006 - 08:47 PM

Also check this:

Subject: Transmission 1-2 Shift Shudder, Vibration, Slips, Chuggle (Install Generator Voltage Sense Circuit) #02-07-30-030A - (11/18/2003)



Models: 2001-2003 Chevrolet Silverado

2001-2003 GMC Sierra

with 4L60-E Automatic Transmission (RPO M30)

Built Prior to August 5, 2003 at Oshawa (Plant Code 1) and Pontiac (Plant Code E) or Prior to August 12, 2003 at Fort Wayne (Plant Code Z)



Vehicles built AFTER the dates listed above will have a Voltage Sense Circuit internal to the generator. These vehicles will NOT have a wire in terminal D of the generator connector.




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This bulletin is being revised to accommodate for a 2003 model year mid-cycle enhancement. Please discard Corporate Bulletin Number 02-07-30-030 (Section 07 -- Transmission/Transaxle).


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Condition
Some customers may comment that the transmission slips, a shudder, chuggle, or vibration is felt when the transmission shifts from first to second gear.

Cause
A 12 Hz electrical feedback from the charging circuit may be affecting the transmission pressure control solenoid, causing a fluctuation of the line pressure within the transmission.

Diagnostic Tip
Road test the vehicle under the following conditions:

Throttle position is less than 15 percent.

Engine coolant and transmission fluid are at full operating temperature.

The outside ambient temperature is warmer than 24C (75F).

If the condition is present, disconnect the generator 4 cavity connector (2 wires in the connector) and retest.

If the condition is no longer present, perform the correction listed below.

If the condition remains unchanged, the condition will not be corrected with this procedure. Look for other causes of the condition.

Correction
Install an external sense lead to the generator assembly. This is accomplished by adding a wire from the generator four wire connector to the generator output BAT terminal.

Disconnect the negative battery cable from the battery/batteries.
Slide the protective boot on the generator BAT terminal aside and remove the retainer and wire cable from the BAT terminal.
Unplug the generator 4-cavity terminal from the top of the generator.
Inspect cavity D on the generator connector for a red cavity plug.
If a red cavity plug is present, it is not necessary to replace the generator connector. Remove the CPA and save. Remove the red cavity plug and continue with step 9.

If a red cavity plug is NOT present, continue with the next step.

Remove and save the orange weatherpack seal and CPA from the 4-way connector.
Using the proper terminal removal tool, remove the two or three wires from the 4-way connector.
On vehicles without Supplemental Brake Assist (SBA), install a red cavity plug, P/N 12059168, into cavity "A" of the new 4-way connector, P/N 12186568.

On some 2003 model year vehicles with SBA, install the dark blue (Circuit 5668) wire of the vehicle wiring harness into cavity "A" of the new 4-way connector.

Install the brown (Circuit 25) wire of the vehicle wiring harness into cavity "B" of the new 4-way connector.
Install the gray (Circuit 23) wire of the vehicle wiring harness into cavity "C" of the new 4-way connector.
Obtain a piece of 0.80 mm/18GA black wire, 254 mm (8 in) long.
Install a red terminal seal, P/N 12048086, and terminal, P/N 12048074, (crimp and solder) on one end of the new black wire.
Install the new black wire into cavity "D" of the new 4-way connector.
Reinstall the connector seal and CPA, from the original connector, to the new connector.
Plug the 4-way connector into the generator.
Route the black wire to the generator BAT terminal, sliding the wire into the small end to the output terminal boot, along side the generator output wire.
Crimp and solder the ring terminal, P/N 12103514, on the open end of the new black wire.
Place the generator output wire and the new black wire onto the generator BAT terminal and install the retainer.
Tighten
Tighten to the BAT terminal retainer to 9 Nm (80 lb in).

Connect the negative battery cable.
Tighten
Tighten the battery cable retainer to 17 Nm (13 lb ft).

Parts Information
Part Number
Description
Quantity needed for this repair
SPO Dealer Cost
J 38125

Kit Tray Location
Available from Kent Moore (approximately $12.50 per pkg)

12048074*
Terminal
1
$0.57
Tray # 2
50 per package

12059168*
Cavity Plug
1
$2.00
Tray # 3
25 per package

12048086*
Wire Seal, Red
1
$2.05
Tray # 3
25 per package

12103514*
Ring Terminal
1
$1.50
Tray # 19
N/A

12186568
Connector
1
$1.30
Must be ordered from Parts.
N/A


Part numbers shown above which have an (*) are found in the terminal repair kit, J 38125. They may be ordered either from GMSPO or SPX Kent Moore.

Parts are currently available from GMSPO.
EARTH FIRST we'll pave the rest of the planets later.

#4 Taaaaaaahoe?

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Posted 26 April 2006 - 10:35 AM

Thanks!

I did have the Pressure Control Solenoid replaced but no luck. Maybe the did not re-program as well?
2003 Tahoe LS 4X4
6.0 HO Lq9, Custom Tune, Gibson Headers, Magnaflow Exhaust

#5 notmo

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Posted 27 April 2006 - 01:07 AM

I know this sounds stupid but check you cat converter. My truck would bog down when it swtcied gears and the engine got hotter. My cat element cracked in half and vibrated sidways and pluged the exauhst.

#6 highwayprowlerz

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Posted 16 October 2006 - 12:37 PM

I have a 2002 Avalanche 1500 4x4 with this same problem.

Could I just replace the transmission pressure control solenoid to fix this problem?

Is it the same part # as mentioned above (#24230632)?

Are there any online guides for this repair/replacement or is it in the Chilton repair guide for my truck?

Thanks.

#7 Ape0r

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Posted 16 October 2006 - 05:01 PM

Tech, my '04 Silv has been doing EXACTLY this - does this tsb apply to my model year as well, or is there another one to cover it?

Really appreciate your help! Truck was built in October of '03.

Edited by Ape0r, 16 October 2006 - 05:02 PM.

'04 Silv. 4x4 5.3 LB
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#8 GM-Tech

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Posted 16 October 2006 - 05:06 PM

Tech, my '04 Silv has been doing EXACTLY this - does this tsb apply to my model year as well, or is there another one to cover it?


Read the bulletin. At the top are the exact models, tranmissions and even build date to which this bulletin applies. If yours doesn't fit ALL those criteria, it doesn't apply.

#9 Ape0r

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Posted 16 October 2006 - 06:15 PM

Tech, my '04 Silv has been doing EXACTLY this - does this tsb apply to my model year as well, or is there another one to cover it?


Read the bulletin. At the top are the exact models, tranmissions and even build date to which this bulletin applies. If yours doesn't fit ALL those criteria, it doesn't apply.

<{POST_SNAPBACK}>


Yeah, figured there might be a different one for the later build dates, that's all.

I did some digging, can't find a detailed version, but it looks like service bulletin #3170/NHTSA#10010577 might apply, "harsh 1-2 shift" is all I can find on it tho. There were several others in the thread mentioned in Tahoe's first post with this problem on other model years.

Thx for your help guys.

Edited by Ape0r, 16 October 2006 - 07:38 PM.

'04 Silv. 4x4 5.3 LB
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