For 1990-2009 cars

# Neutral Flare and/or RPM Flare While In Drive, No 1-2 Upshift, Service Engine Soon (SES) Light Illuminated, Diagnostic Trouble Codes (DTCs) P1810, DTC P1815 Set (Reprogram the Powertrain Control Modul

Subject: | Neutral Flare and/or RPM Flare While In Drive, No 1-2 Upshift, Service Engine Soon (SES) Light Illuminated, Diagnostic Trouble Codes (DTCs) P1810, DTC P1815 Set (Reprogram the Powertrain Control Module (PCM), Replace Transmission Fluid Pressure (TFP) Manual Valve Position Switch)

Models: | 1995-2003 Chevrolet Cavalier

| 1997-2003 Chevrolet Malibu

| 1999-2003 Oldsmobile Alero

| 1995-2003 Pontiac Sunfire

| 1998-2003 Pontiac Grand Am

| with 4T40E Transmission (RPO MN4) or 4T45E Transmission (RPO MN5)

This bulletin is being revised to add reprogramming of the PCM on 2003 V6 models. Please discard Corporate Bulletin Number 03-07-30-021 (Section 07-Transmission/Transaxle)

### Condition

Some customers may comment on a neutral flare and/or RPM increase while in drive or no 1-2 upshift and/or the Service Engine Soon (SES) telltale may be illuminated. On 1995-2002 model vehicles, the Powertrain Control Module (PCM) may set a DTC P1810 while on 2003 model vehicles, the PCM may set a DTC P1815.

### Cause

The cause may be the transmission fluid pressure (TFP) switch (also known as the pressure switch manifold (PSM)). It will be referred to as the TFP switch in this bulletin.

### Correction

Follow the diagnosis and service procedure below to correct this condition.

#### VIN BREAKPOINTS

MY & Carline | VIN Breakpoint | Calibration #
--- | --- | ---
2003 Chevrolet Malibu | Built Prior to 3M541000 | 12583336
2003 Oldsmobile Alero | Built Prior to 3C139000 | 12583334
2003 Pontiac Grand Am SE | Built Prior to 3C139000 or 3M541000 | 12583332
2003 Pontiac Grand Am GT | Built Prior to 3C139000 or 3M541000 | 12583333

1. If servicing a 2003 Alero, Grand Am, or Malibu with a V6 (RPO LG8 or LA1) for a DTC P1815 built prior to the VIN Breakpoints listed in the table above, REPROGRAM the PCM with the calibrations listed, prior to replacing the TFP switch.

Important: Before installing the new TFP switch, inspect the date code stamped in the switch. The date code MUST BE 2308 or higher. Refer to the illustration above.

2. Replace the TFP switch. Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement (SI Document ID #803989).
3. Clear the code and road test the vehicle.
4. If additional diagnosis is required to correct this condition, refer to

• | For diagnosis of DTC P1810, refer to DTC P1810 (SI Document ID #854362).

• | For diagnosis of DTC P1815, refer to DTC P1815 (SI Document ID #854374).

### Parts Information

Part Number | Description | Qty
--- | --- | ---
24226580 | Switch, Transmission Fluid Pressure (TFP) | 1

Parts are currently available from GMSPO.

### Warranty Information

For vehicles repaired under warranty, use:

Labor Operation | Description | Labor Time
--- | --- | ---
K6351 J6354 | Switch Assembly, Auto Trans Fluid Pressure - Replace Important: PCM Reprogramming ONLY Applies to 2003 Vehicles Reprogram, Powertrain Control Module (PCM) | Use Published Labor Operation Time