trans error code help

I dont have the number at the moment, but it translated into the following: transmission fluid pressure switch start up in wrong range

History: Original trans imploded. Bought a used trans that had 6000 miles on it.

2003 Olds Alero
2.2L Automatic

Is this an easy fix or is it something that will require a bunch of work?

Any and ALL help is wanted and welcomed. Please fire away.

Ken

Welcome to AF.

Does P1810 ring a bell? Which is an issue with the TFP manual valve position. The TFP/TFT assembly is located under the tranny side cover assembly (driver's side).

The first step is to make sure the ATF level is proper. Then check the transmission range switch and linkage to make sure the car is in the right gear when selecting gears with the shifter. Next remove and reseat the 20 way electrical connector to the transaxle. If above doesn't help then you will need to troubleshoot the TFP manual valve circuits to determine if the TFP pressure sensor is defective.

thanks for the help, Im currently about 40 miles from where the car is at, but I relayed your comments to my brother inlaw.

I'll let you know what he finds.


Ken

ok, he said he went through everything, unplugged everything and then the code went away. three more starts it came back, along with a new code 1815... Any clue what that one is?

Ken

Here is a GM TSB on this issue, you might find it helpful. This does require the trany to be dropped.

09-26-2003, 11:06 AM
#03-07-30-021 Neutral Flare and/or RPM Flare While In Drive, No 1-2 Upshift, SES

Neutral Flare and/or RPM Flare While In Drive, No 1-2 Upshift, Service Engine Soon (SES) Light Illuminated, Diagnostic Trouble Codes (DTCs) P1810, P1815 Set (Replace TFP Manual Valve Position Switch) #03-07-30-021 - (05/15/2003)
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 (Replace Transmission Fluid Pressure (TFP) Manual Valve Position Switch)

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)
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.

Perform the following diagnostics to correctly repair this condition
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).

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.


Replace the TFP switch. Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement (SI Document ID #803989).
Clear the code and road test the vehicle.
Parts Information
Part Number
Description
Qty

24226580
Switch, Transmission Fluid Pressure (TFP) 1