2003 saturn l-series l300..I replaced throttle body and was still getting reduced power and started blowing controls b 10 amp fues when key was on so i traced it to the ecm/pcm. Replaced it and then did the passlock relearn and now when i start it the rpms go straight to 4000-4500 and dont go below 3500

Is this the one ?
CONTROLS IGN 1
Red (10)
Powertrain Control Module/Cooling Fan Control Module/Automatic Transaxle

The wiring or one of these listed above has a short . Disconnect the cooling fan control module and see if the problem goes away , if it does you need a new cooling fan control module . Do you know where it is ?

2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

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Reduced Engine Power Message Displayed on GM Vehicles

www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis...
Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

Your vehicle has electronic throttle control an the Throttle position sensor's are internal to the throttle body assembly ! Your vehicle has two throttle position sensors .
Throttle Body Assembly
The throttle assembly contains the following components:
?€¢ The throttle blade ?€¢ The throttle actuator motor ?€¢ The throttle position (TP) sensor 1 and 2 You have to replace the Throttle Body Assembly !
Disconnect the negative battery cable. Remove the inlet hose assembly from the throttle body. Disconnect the throttle body electrical connection. Disconnect the hose clamps from the plenum-to-runner connector using theJ 43914 .
Remove the intake plenum bolts. Remove the EGR passage bolt. Rotate the plenum up and remove the throttle body coolant hoses, EVAP hose, and vacuum line from the throttle body.
Remove the throttle body nuts. Remove the throttle body.

If you did actually need a throttle body you could
get it for less than $800 new or get a used one &
install yourself in about an hour.

Only got 4 small bolts holding it on.

The only reason for a throttle body is if it is
drive by wire & you need a tacm motor on it
& that motor is not avail separately

Do some internet research on that issues

I would be looking at fuel pressure at the motor,
fuel trim on a road test, oxygen sensors, ignition
issues long before I got stumped & ended up at the
throttle body

If it is has a motor turn on the key & have someone
slowly push the gas pedel

If the throttle plate opens & then snaps closed,not
the problem

Also consider a gas filter that has been never changed in
10 years or a blocked exhaust converter or exhaust leaks
before the converter effecting fuel adjustment

Need to know in detail what was tested & how by that shop

how old is the battery?

This has nothing to do with the heat on the vehicle .
Reduced Power
The reduced power telltale is turned ON by the cluster when it receives a command from the body control module (BCM). The engine control module (ECM) (L81) engine sends a message to the BCM over the CAN serial data link.
The reduced power telltale is illuminated when the ECM is limiting engine torque in a low traction situation. This telltale is used only for the V6 (L81) engine application.
The reduced power telltale is turned ON by the cluster for 2-3 seconds, when the ignition is turned to RUN, for a visual system check.

Taking the vehicle to a qualified repair shop an having it diagnosed would be your best . Unless you have a factory tech 2 scan tool to read BCM DTC'S - diagnostic trouble code's an have factory diagnostic repair info.
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
• Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
• Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

the body control module or BCM is located on top of the inside of the glove box,remove the lower trim panel under the passenger foot well under the glove box,the the 4 screws that hold the glove box door on,,,then the screws that hold the box to the dash and the BCM is slid into the top of the box,,,,,,you are gonna need it programmed as it comes new blank,and the car will not start with out a program

You are not the only one. Ive met a good many of Saturn owners (most were 2001 L300 drivers) but they were plagued with the problem you have and practically identical codes. The following remedies have been known to work:

1. Replacement Battery Cable
2.Replacement ECU Wiring Harness
3. Replacement of ECU

reduced power messge is not caused by oil pressure. i assume this a 3.0L v6. this engine has a electronic throttle body which is a electric motor that operates the throttle plate that takes the place of a throttle cable. in cold weather the pcv (positive crankcase venelation) system accumulates moisture that will form on the throttle plate, in cold weather the water freezes and causes throttle plate to stick. when the ecm detects any malfunction whithin the throttle control circuit it is put in to reduced power mode that limits throttle position. usually resets after ign. is cycled. there is a service bullitin to re-position pcv hose behind throttle plate to reduce moisture bulid-up on throttle plate. your saturn dealer can perform this service.

Sorry to say but it's probably the BCM (body control module) that's going in her car. The BCM controls everything inside your car, from the gauges, locks, daytime running lamps, ABS... and yes the security system. I have a 2003 L200 which had the same problem and I had to replace the BCM at some cost ($400-$600) depending on where you go. The L-Series Saturns seem to have a problem with their BCMs and it seems that it's pretty prevalent. Unfortunately it will only get worse as time goes on and it's not something that you can do yourself as it needs to be programmed by the dealer. You also will need to get your remotes reprogrammed as well with the new BCM. Hope this helps.