P1780 means what on a 2002 saturn L300.... And how do you fix it

never heard of a feal filter

https://www.2carpros.com/questions/2002-saturn-l300-location-blower-motor-replace-find

#PIP3922: Repeat DTC P0606 And P1780 Setting - keywords 00 01 02 03 04 05 DTC JB L81 MAF MIL P0606 P1780 reducedpwrmde reman saturn - (Sep 26, 2006)

Subject: Repeat DTC P0606 and P1780 Setting

Models: 2000-2005 Saturn L series with L81 V6 The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A technician may find codes P0606 and P1780 setting. They may state that they are not able to duplicate the concern. Tech may state that when the customer is driving they report a sudden loss of power, then no throttle response, and the warning indicators come on. Tech may also state that the ECM and MAF were replaced with no change.
Recommendation/Instructions:
These codes will set if the wrong MAF was installed on the vehicle previously. This being an intermittent code the MAF may work without any concerns initially. The retailer may not be aware of 2 different part number MAF's for 2000-05 L series with L81. Compounding this is the reman sticker may fall off and GM does not cross reference the Bosch part number to theirs. Any time these codes are setting have technician verify the correct MAF is installed using the reference below
The part numbers are:
2000-03 90528435 Last 3 of Bosch # 184 (important because the reman sticker may be missing)
2004-05 24437651 Last 3 of Bosch # 087 (important because the reman sticker may be missing)
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a ""do-it-yourselfer"". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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p1780 code indicates a problem in the transmission or the communication lines between the body control module and the engine control module...If the transmission had a true fault of this type in it, it would not cause the engine to shut down.
The most likely cause is that there was a glitch. Unfortunately this will be a reoccurring problem until it is fixed. If the engine check light starts to flash that means it is in limp mode and you will probably only be running about 10 miles per hour. I would say take it to Saturn dealer unfortunately they no longer exist. Best thing to do is have a transmission shop check it out. Or automotive shop sorry I don't have better news.

DTC P1780 (3.0L (L81))

To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1780 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1780.
When the TCM receives a torque reduction failure message from the ECM, then DTC P1780 will set. DTC P1780 is a type C DTC. Take your pick of which you think this code is for , this or the TSB - technical service bulletin. What need to hook up scan tool an data PID'S - Do you know what PID'S are ? sensor data read on a scan tool .

Gm p1780 is torque converter clutch problems undefined on a saturn?

P1780 Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit

you have the 3.0 V6, there is an oil cooler under the intake manifold that is known to cause problems, be very very careful if you try to fix it yourself, the saturn 3.0 is not an easy engine to deal with.

Yes the P1780 DTC is the Transmission Control Switch Circuit is out of self test range.

youturn signal flasher is part of the hazzard switch located in the center of the dash above the radio. the trim piece around the radio and the climate controls pops off using a small flat bladed scewdriver.