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Old 09-27-2017, 09:59 AM   #3
pierrot
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Join Date: Jun 2012
Location: Glendora, CA
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2000 L-Series 2.2L Sedan
Default Re: Limp mode when I accelerate or use air codition

Welcome to SaturnFans, rotimy!

Quote:
Originally Posted by rotimy View Post
I have a saturn L300, 2001 model v6, 3.0L.
Whenever I use the air condition or drive the car for about 3miles, the car gets into limp mode. If I dtive above 40mph or try to speed up while climbing an hill, it also gets into limp mode. If I stop the car and restart the car after minutes of waiting, it will drive well provided I didn't put on the air condition or go above 40mph.
1) How long has this problem persisted?
2) What is the mileage and maintenance history of this car?
3) Is the Service Engine Soon (SES) warning light on, or has it been recently illuminated at the dash console?

Quote:
Originally Posted by rotimy View Post
I was advised to change the throttle body. I bought a fairly used throttle body as replacement but the problem parsists. A mechanic after troubleshooting on the car adviced me to change the ECM.
4) Was the advice previously received about replacing the throttle body given by the same mechanic who has suggested replacing the ECM?
5) Did this mechanic tell you whether or not there were any trouble codes present to be read from the ECM (typically read as "P" followed by four numbers: P----)?
6) Do you have any background in automotive repair as a DIYer (do-it-yourself-er) or in any other capacity?

Limp mode is a fail safe setting in the ECM related to the "Drive By Wire" accelerator pedal and throttle body. It prevents a "runaway" situation where the driver is no longer able to control acceleration. However, this particular condition may arise from other problems.

Quote:
Originally Posted by rotimy View Post
I have ordered for ECM but I am not sure this will solve the problem. Please do you have any advice for me?
If you've ordered a new ECM please don't install it until there has been further investigation into this problem. As an outsider looking in on this concern, I want and need more information (the reason for the questions above) before agreeing that replacing the ECM is a proper course of action. It may, or may not correct this condition. If it is not the source of this condition and the part container is unopened, then it may be possible to return it later and receive a refund. Otherwise, you may be stuck with an expensive unneeded new part.

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