Question about 2003 Oldsmobile Alero

1 Answer

2003 olds alero will not communicate with a scan tool

Was troubleshooting security issues, but was able to start with fuel pump relay jumper, previous communication was established with a snap on solus ultra, had codes for no key in ignition and horn relay fault, nothing was changed or grounded, etc. next time i went to check codes the scan tool said no response - check for key on (it is) / data link connection

Posted by Anonymous on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Oldsmobile Master
  • 2,517 Answers

Start from scratch. Remove key and retry it.

Posted on Sep 26, 2017


6 Suggested Answers


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017



  • 321 Answers

SOURCE: 99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Posted on Dec 04, 2008


Colin Stickland

  • 22485 Answers

SOURCE: 2000 alero wont start, changed battery, still wont start.


Posted on Jan 23, 2009


  • 1 Answer


Check to make sure the Security light in dash on right hand corner is not on. If it is on , your passlock is enabled. to dissable it turn your key on but not start it and wait for apx 10-15 minutes. this should re-set it.

Posted on Apr 15, 2009

Richard Scordino

  • 6982 Answers


find the buzzing noise...likely its the fuel pump relay.

Posted on May 28, 2009


  • 8 Answers

SOURCE: 2003 olds alero igntion/starting problem

i own a 03 alero ... aleros have history of igniton switches going bad... replace it or take it to dealer then ull be charged arm and leg...

Posted on Jun 01, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My car was running fine and out of nowhere it just shut off and it wont start back

The same thing happened to my 03 olds Alero, i pluged my scan tool in and found out that my fuel pump was bad, I changed the fuel pump, fuel filter, and also checked the fuel injectors and blew out the fuel lines, now it's running great.

Feb 27, 2015 | 2003 Oldsmobile Alero

1 Answer


The pump gets power from the pump relay, for 3-5 seconds during cranking, and then once the engine computer sees oil pressure or RPM. The engine computer grounds the relay.

Jan 21, 2014 | Cars & Trucks

1 Answer

1999 olds alero---cranks strong but wont start---n gas needle goes to empty when turn key to on position

check fuel pressure.sound like fuel pump not working.fuel pressure should be 41 - 47 psi. if not replace fuel filter, still too low pump faulty, if you not getting fuel pressure, pump still not working check fuel pump fuse and relay.code scan car first look for fault in controls the fuel pump relay and fuel pump.

Mar 08, 2011 | 1999 Oldsmobile Alero

2 Answers


Im not sure if you got your alero to start yet. But heres an Idea, The alero comes with a security feature that if you have 3 failed starts it activates. a good sign of this is while having the key turned does your security light flash on the dash. if so turn the key forward with out starting the car and leave it on for 10 minutes and then the security light on the dash should stop flashing. Now turn the key off and remove key stick key backin and turn over to start car. Did your car start ??

May 10, 2010 | 2003 Oldsmobile Alero

1 Answer

Shutting down

Try replacing the air filter.

Dec 21, 2009 | 2003 Oldsmobile Alero

1 Answer


find the buzzing noise...likely its the fuel pump relay.

May 28, 2009 | 2003 Oldsmobile Alero

2 Answers

Fuel pump non functioning

Hi. here are a few steps that will help you troubleshoot this device.

Step1 Go to the back of your carand take off the fuel filler cap. Ask an assistant to turn the ignitionon but do not start the engine. Listen closely for a brief, vibratorysound coming from the tank. If you cannot hear the sound, go to thenext step. Step2Check the fuel pump circuit fuse. It should be in the fuse panel underthe dashboard or in the engine compartment Verify that it is in goodcondition and the contacts are free from corrosion. If necessary,replace it and test the pump again. Step3Inspect fuel lines, hoses and connectors. Make sure hoses are not torn,bent or obstructed. Verify there are no gas leaks. Step4Locate the fuel pump relay. You might find it in the enginecompartment, at the driver or passenger side and close to thewindshield or at the front of the engine as part of a cluster ofrelays. Another common place is under the dashboard. Step5Remove the fuel pump relay. Ask an assistant to turn the ignition onbut do not start the engine. Using a test light, check for incomingvoltage at the relay connector. If there is no voltage, check for anopen or short at the wire between the relay and the fuse panel. Step6Jump the relay connector to apply battery voltage to the fuel pump.After the jumper wire is connected, ask an assistant to turn on theignition while you listen for fuel pump operation as described in step1. If the fuel pump works now, replace the relay and test again.Another alternative is to test the fuel pump relay for properoperation. Step7Locate the fuel pump connector at the back of the car and check forincoming voltage with a test light. While you check for voltage, ask anassistant to turn on the ignition but do not start the engine. If thereis no voltage, check for an open or short at the wire between the relayand the fuel pump. Step8 Check the power and ground connections at the pump and make sure they are good and free of corrosion. Step9Test the fuel pump. Apply direct voltage to the fuel pump. If youcannot easily remove the fuel pump through the trunk of your vehicle,you might want to take a fully charge car battery to the back of thecar. Raise the vehicle and secure it firmly on jack stands. Unplug thefuel connector and use a couple of jumper wires to connect the batteryto the fuel pump. If the pump does not work, replace it.

Please rate and god bless:)

Apr 05, 2009 | 2003 Oldsmobile Alero

1 Answer

2003 Caravan No Crank, 3.3L

This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

Aug 09, 2008 | 2003 Dodge Caravan

Not finding what you are looking for?
2003 Oldsmobile Alero Logo

Related Topics:

105 people viewed this question

Ask a Question

Usually answered in minutes!

Top Oldsmobile Experts

Jonah Oneal

Level 3 Expert

14092 Answers


Level 3 Expert

85222 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Are you an Oldsmobile Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides