For 1990-2009 cars

# Information on 4T40-E (MN4) and 4T45-E (MN5) Front Wheel Drive Automatic Transmission Valve Body Reconditioning DTC P0741, P0742, P0751, P0752, P0756, P0757, P1811, Harsh Shift, Slip, No Drive/Reverse

Subject: | Information On 4T40-E (MN4) and 4T45-E (MN5) Front Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0742, P0751, P0752, P0756, P0757, P1811, Harsh Shifts, Slips, No Drive, No Reverse

Models: | 1997-2005 Chevrolet Cavalier

| 1997-2007 Chevrolet Malibu

| 2005-2007 Chevrolet Cobalt

| 2006-2007 Chevrolet Malibu Maxx, HHR

| 1997-1998 Oldsmobile Cutlass

| 1999-2004 Oldsmobile Alero

| 1997-2005 Pontiac Sunfire

| 1999-2005 Pontiac Grand Am

| 2005-2006 Pontiac Pursuit (Canada Only)

| 2005-2007 Pontiac G6

| 2007 Pontiac G5

| 2000-2005 Saturn L-Series

| 2005-2007 Saturn ION, VUE

| 2007 Saturn Aura

| with Hydra-Matic® 4T40-E (RPO MN4) and 4T45-E (RPO MN5) Automatic Transmission

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. The service bulletin will also provide additional service information documents that are related to the 4L6x transmission family.

#### Related Service Documents

• | PIP 3253B - No Move Drive or Reverse

• | 02-07-30-039F - Firm Transmission Shifts

• | 02-07-30-050 - Engineering Change Valve Body

Important: If valve body cleaning is not required, Do Not disassembly 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 valve and bore, then replace valve body. Describe restricted valve on 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
--- | ---
301 | Spring, 1-2 Shift Valve
302 | Valve, 1-2 Shift
304 | Retainer Clip
305 | Solenoid with O-Ring, 1-2 Shift Solenoid with O-Ring, 2-3 Shift
306 | Spring, 2-3 Shift Valve
307 | Valve, 2-3 Shift
308 | Spring, Torque Signal Regulator
309 | Valve, Torque Signal Regulator
312 | Solenoid, Pressure Control with Two O-Rings and Screen
314 | Filter, Actuator Oil
315 | Valve, Actuator Feed Limit
316 | Spring, Actuator Feed Limit
317 | Plug, Bore
318 | Spring, 3-4 Shift Valve
319 | Valve, 3-4 Shift
321 | Plug, Bore with O-Ring

#### Right Side Control Valve Body Assembly

Call Out Number | Description
--- | ---
304 | Retainer Clip
317 | Plug, Bore
323 | Valve, Accumulator
324 | Bushing
325 | Valve, Pressure Regulator Boost
326 | Spring, Isolator
327 | Spring, Pressure Regulator Valve
328 | Valve, Pressure Regulator
329 | Spring, 2-3 Accumulator Valve
330 | Valve, 2-3 Accumulator
331 | Spring, TCC Feed Limit
332 | Valve, TCC Feed Limit
333 | Spring, TCC Control Valve
334 | Valve, TCC Control
335 | Solenoid, TCC with Two O-rings
339 | Valve, TCC Regulated Apply
340 | Spring, TCC Regulated Apply Valve
341 | Plug, Bore

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 valve and burr, then inspect movement in the valve’s normal position. If no other debris or restrictions are found, then reassemble 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 following 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.