For 1990-2009 cars

# Information on 4L60-E M30 Rear Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0756, P0894, Harsh 1-2 Shift

Subject: | Information on 4L60-E M30 Rear Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0756, P0894, Harsh 1-2 Shift

Models: | 2004-2007 Buick Rainier

| 2002-2005 Cadillac Escalade

| 1997-2002 Chevrolet Camaro

| 1997-2003 Chevrolet Corvette, S-10

| 1997-2005 Chevrolet Astro

| 1997-2005 Chevrolet Blazer

| 1997-2007 Chevrolet Express, Silverado Classic, Silverado, Suburban, Tahoe

| 2002-2007 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT

| 2004-2007 Chevrolet Colorado

| 2004 Chevrolet SSR

| 1997-2003 GMC Jimmy, Sonoma

| 1997-2005 GMC Safari

| 1997-2007 GMC Savana, Sierra Classic, Sierra, Yukon

| 2001-2007 GMC Envoy, Envoy XL, Envoy XUV, Envoy Denali, Envoy XL Denali, Yukon XL, Yukon Denali, Yukon XL Denali

| 2004-2007 GMC Canyon

| 1997-2004 Oldsmobile Bravada

| 1997-2002 Pontiac Firebird

| 2004 Pontiac GTO

| 2006-2007 HUMMER H3

| 2005-2007 Saab 9-7X

| with Hydra-Matic® 4L60-E Automatic Transmission (RPO M30)

The following new service information outlined in this bulletin will aid technicians in providing easy to follow valve body reconditioning instructions and new illustrations to simplify reassembly of the valve body. This service bulletin will also provide additional service information documents that are related to the 4L60-E transmission.

#### Related Service Documents

• | DTC P0741 - Torque Converter Clutch (TCC) System - Stuck Off. Refer to Service Bulletin 04-07-30-041.

• | DTC P0756 - 2-3 Shift Solenoid Valve Performance - No First or Second Gear. Refer to Service Bulletin 01-07-30-036F.

• | DTC P0894 - Transmission Component Slipping. Refer to Service Bulletin 06-07-30-007.

• | Harsh 1-2 Shift. Refer to Bulletin PIP3170E.

Important: If valve body cleaning is not required, Do Not disassemble the bores unless it is necessary to verify movement of valves.

#### Inspection Procedure

1. Using the exploded views in this bulletin, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer’s concern.
2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores.
3. If a valve is restricted and cannot be corrected by cleaning the valve and bore, then replace the valve body. Describe the restricted valve on the repair order.

#### Valve Body Spring and Bore Plug Chart (Metric)

#### Valve Body Spring and Bore Plug Chart (Inch)

#### Left Side Control Valve Body Assembly

Call Out Number | Description
--- | ---
350 | Valve Assembly, Control Body
354 | Piston, Forward Accumulator
355 | Pin, Forward Accumulator
356 | Spring, Forward Accumulator
357 | Valve, Forward Abuse
358 | Spring, Forward Abuse Valve
359 | Plug, Bore
360 | Pin, Coiled Spring
361 | Valve, Low Over Run
362 | Spring, Low Over Run Valve
363 | Cover, Forward Accumulator
364 | Bolt, Forward Accumulator Cover
365 | Spring, 1-2 Shift Valve
366 | Valve, 1-2 Shift
367 A | Shift Solenoid A (1-2 / 3-4)
367 B | Shift Solenoid B (2-3)
368 | Valve, 2-3 Shift
369 | Valve, 2-3 Shuttle
370 | Spring, Accumulator Valve
371 | Valve, Accumulator
372 | Sleeve, Accumulator Valve
374 | Valve, Accumulator Feed Limit
375 | Spring, Accumulator Feed Limit Valve
376 | Plug, Bore
377 | Pressure Control Solenoid
378 | Retainer, Pressure Control Solenoid
387 | Valve, Reverse Abuse
395 | Retainer, Bore Plug

#### Right Side Control Valve Body Assembly

Call Out Number | Description
--- | ---
340 | Valve, Manual
357 | Valve, Forward Abuse
359 | Plug, Bore
360 | Pin, Coiled Spring
380 | Valve, Regulator Apply (Model Dependent)
381 | Plug, Bore
382 | Spring, 4-3 Sequence Valve
383 | Valve, 4-3 Sequence
384 | Valve, 3-4 Relay
385 | Valve, 3-4 Shift
386 | Spring, 3-4 Shift Valve
387 | Valve, Reverse Abuse
388 | Spring, Reverse Abuse Valve
389 | Valve, 3-2 Downshift
390 | Spring, 3-2 Downshift Valve
391 | Valve, 3-2 Control
392 | Spring, 3-2 Control Valve
394 | 3-2 Control Solenoid
395 | Retainer, Bore Plug
396 | TCC PWM Solenoid
397 | Spring, Regulator Apply (Model Dependent)
398 | Valve, Isolator (Model Dependent

Notice: Be sure all solenoids are installed with the electrical connectors facing the non-machined (cast) side of the valve body; otherwise the solenoids will bind against the transmission case as the valve body bolts are tightened and damage may occur.

#### Disassembly/Reassembly

1. If a valve is restricted by a metal burr from machining that bore, remove the valve and burr, then inspect movement in the valve’s normal position. If no other debris or restrictions are found, then reassemble the valve body and install in the transmission.
2. If the valve body has been contaminated with debris from another transmission component failure, then disassemble all bores for complete cleaning of all valve body components. If possible, keep individual bore parts separated for ease of reassembly. Use the illustrations in this bulletin for a positive identification and location of individual parts:

• | Left Side Control Valve Body Assembly

• | Right Side Control Valve Body Assembly

• | Control Valve Body Assembly Chart, Valve Springs and Bore Plugs

3. Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with compressed air. Use appropriate eye protection.
4. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore.