Question about 1997 Oldsmobile Aurora

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P0603 Last week my check engine light comes on saying bank one and bank two running too lean. a week later it turns off before i could replace my mass air flow sensor. Now i have a new code, p0603- random access memory fault/ failed ecm and now only bank one is running too lean as well. would this be a pcm issue or is it really my ecm acting up? i'm nervous to clear the codes by disconnecting my battery to see it comes back on. i'm thinking it might not know how to run correctly if it does have this issue. any suggestions before i spend gobs of money on a ecm or pcm. Thank you!!

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  • 181 Answers

Hello. You can give it a try by diconncting the battery. If it does give you problems again, then you need to go to a well know junkyard that have good condition cars and items. Look for the same cars as yours and get both the ecm and pcm.

Posted on Apr 19, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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ewashmidas
  • 362 Answers

SOURCE: PO171 error code System too lean bank 1

Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Posted on Jan 28, 2009

  • 422 Answers

SOURCE: I have a 1999 oldsmobile

fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

Posted on Aug 26, 2008

  • 30 Answers

SOURCE: cam position sensor

The cam position sensor tells your computer when the #1piston is in position and your vehicle will not run without it as it would not know when to fire the cylinders. However, you could be having intermittent problems with it which means it is failing but hasn't broken completely yet. Since you have a code in for the sensor I would check the wiring and connection. If all that looks ok then I would replace the sensor. Better to replace it before it completely fails and strands you someplace.

Posted on Aug 19, 2008

honeymokey
  • 3113 Answers

SOURCE: 96 aurora P0603 and P0300 codes

The battery must have been disconnected at some time to set po603 keep alive memory. You will need a scan tool to reset computer.

Posted on May 23, 2009

Molson02536
  • 3854 Answers

SOURCE: rEPLACING mass air flow sensor

The mass flow sensor on the 1999 intrigue is along the intake tube right after the air filter intake housing. Loosen the two clamps that hold the MAF sensor between the Air filter box cover and air intake tube, disconnect the wire leads at the MAF sensor connection and remove the MAF. Note it's uncommon for the MAF sensor to go bad and 95% of the time, cleaning it with MAF sensor with MAF cleaner will fix any problem it may of had to trigger the DTC codes.
Start with trying to clean it first just by following the instruction on the MAF cleaner. This should save you time and money to get your Intrigue running 100% again soon.
Good luck and thank you for using Fixya.

Posted on Mar 18, 2010

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1 Answer

P0603 code


I dont think you have a choice? i would Disconnect the battery, & check codes again after. If i have doubts, i alwyas start with the least exspensive parts first.

Apr 19, 2014 | 1997 Oldsmobile Aurora

1 Answer

Failed ecm p0603


Instead of guessing as to what the problem is or expecting someone on here having a magical fix , take it to a qualified repair shop. Before assuming the worst an wanting to condem the PCM - powertrain control module . Will a scan tool communicate with it ? If your pulling codes it is .
DTC P0603 Control Module Long Term Memory Reset
The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Have you disconnected the battery ?
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Jun 21, 2017 | 1997 Oldsmobile Aurora

1 Answer

I have a check engine light on. I had 2 O-2 sensors replaced and the next day the light came back on and it reads bank 1 sensor 1 and bank 2 sensor 1, engine running lean. I took car back and mechanic said...


Probably a faulty Mass Airflow Sensor.These have a high failure rate.Road test with scanner and watch the MAF readings under load,should be able to reach 120 grams per second.If the readings are low,replace sensor.

Sep 06, 2011 | 2003 Land Rover Discovery

2 Answers

I have a 2001 Jimmy with "Service Engine Soon"


P0171 System too lean bank 1
P0174 System too lean bank 2

Last time you changed your fuel filter?
Look for any vacuum leaks.

Sep 05, 2011 | 2001 GMC Jimmy

1 Answer

I have 2002 chevy avalanche, check engine light comes on only when its cold & runs rough at idle. When warmer weather light goes off & runs fine. Have replaced mass air flow sensor.


Mine did the same thing...at 42F degrees, run bad. After it warm up, it would be fine. This would only happen in the winter. It would throw a code saying it was lean in Bank 1 or 2.
The issue is a contraction of the intake gasket due to the cold weather, when it contracts, it leaks air. There is a new, improved gasket now from GM, or get a Felpro from major auto stores and it will work fine. I consistently had the problem every winter, and this has fixed the problem for the last 3-4 years.

Jan 04, 2011 | 2003 Chevrolet Avalanche

2 Answers

My car has been "stuttering"


First check all the vacuum lines and hoses. Then remove the mass air flow sensor(maf) and spray it down with brake clean, just the inside and hit the part that hangs down front and back, don't use a brush on it. these are the only two things that I know of that will give you lean codes on both banks at the same time. If this doesn't help have the maf sensor checked.

Nov 30, 2010 | 2001 Ford Escape

1 Answer

Check engine light


It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.

May 05, 2009 | 2005 Ford Focus

1 Answer

Check engine light on code 171and 174


Sounds like a dirty Mass Air Flow sensor.

Mar 26, 2009 | 1997 Lincoln Town Car

3 Answers

Mass Air Flow Sensor, oxygen sensor and coil plugs


look for vacuum leaks the last 4 codes are lean codes
primarily lookm at the pcv hose noturious for collapsing

Sep 16, 2008 | 2000 Ford Expedition

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