Question about 2002 Oldsmobile Silhouette

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My engine data system says I am only putting out 11.0 volts. The system keeps saying generator problem. is it the altenator? Or what?

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GM calls alternators generators.  If your vehicle starts, start it and remove the battery red connection...careful you're near the belt.  If the engine stops and all the lights don't work, your alternator is bad.  If not, you'll need to get a pro in to evaluate the data system.  

Posted on Nov 11, 2008

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What it it is is the regulator inside the altenator. so you will have to replace it. hope this helps please rate the solution thanks and good luck.

Posted on Aug 30, 2008

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My battery light came on while i was driving than a few minutes later everything shut off. The battery was replaced in january and alternator was replaced in october.. what could be the problem?


For the alternator to work B+ voltage must be applied to the heavier gage wire on the back of the alternator ,plus the alternator is computer controlled , by the PCM !
Charging System Indicators
BATTERY The IPC illuminates the battery indicator when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


?€¢
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


?€¢
The ignition is on, with the engine off.
BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


Your best is to have a qualified repair shop check it out ! Could have DTC'S - diagnostic trouble codes stored !
DTC P0562
The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other drive ability concerns.
DTC P0621
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
DTC P0622
Checking for codes an voltage drop testing the connections an using a scan tool to check data parameters is the only way to solve your problem . Which means taking to a qualified repair shop !

Jul 26, 2016 | 2002 GMC Envoy

1 Answer

I have a 2002 GMC Envoy, Quite frequently my charging light will come on and state that I only have 10 volts coming out and then all the sudden jump to 14 and work perfectly fine


How many mile are on you vehicle ? Have you ever had Alternator replaced before ? You alternator maybe starting to fail , brushes or the voltage regulator .
Charging System Indicators
BATTERY The IPC illuminates the battery indicator when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


?€¢
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


?€¢
The ignition is on, with the engine off.
BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage


It would be a good idea to have it checked out , most auto parts stores will do this for free !

Dec 29, 2015 | GMC Cars & Trucks

1 Answer

2006 chevy trailblazer is not charging battery. battery and alt are new


Volts slowly drop to where what quits ,The vehicle stops running ? Is the charge indicator light lit on the instrument cluster /? are any lights lit on the instrument cluster ? The instrument panel cluster (IPC) illuminates the charge indicator and the BATTERY NOT CHARGING message is displayed in the message center when the following occurs:
The engine control module (ECM)/powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the ECM/PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.


?€¢
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


?€¢
The ignition is on, with the engine off

Mar 11, 2015 | 2006 Chevrolet Trailblazer

1 Answer

Battery light comes on and off and computer says service charging system and battery not charging sometimes when I first start the engine its fine but after awhile battery light comes on and battery not...


what you need to do is check the altenator for voltage it should be between 13 and 15 volts this is easily done with a standard volt meter check it at the altenator witch is located right on top of the engine on the back of the altenator there is a thick red wire that is where you want to put the positive and just put the black wire of the volt meter on the case of the altenator and check the reading it sounds like the altenator is bad there is also a fuse you should check your owners manual for location of the fuse also have your battary checked this should help ant questions just ask me

Jan 23, 2014 | Cars & Trucks

1 Answer

My 1991 dodge ramcharger will not charge. I have had it to the repair shop twice and they keep saying its the alternator. They said they tested the complete charging system and found nothing wrong with...


compare the voltage at the back of the alternator (large post) to the voltage at the battery, when sitting while engine off and running-the readings should be identical. If not, you have a wiring problem or if that is ruled out, the ECM is the issue. You should get readings of 12.5+ volts after sitting overnight, and close to 15 volts when first started, gradually dropping down to about 14.2 volts, at BOTH locations.

Apr 19, 2011 | 1991 Dodge Ramcharger

2 Answers

Battery no charge


Either the battery is old and won't hold a charge or your altenator is not putting out enough to charge the battery. If the car is running disconect the positve side on the battery and if the car keeps running then the battery is bad, if it dies then the altenator is bad. Could aslo be a bad voltage regulator, but those are in the module.

Mar 15, 2011 | 1996 Cadillac DeVille

1 Answer

My daughter is driving our old 1999 Saturn hatchback. She just called and told me the batter light came on when she started the car, then it starts to flash....The faster she drives, the more the light...


the battery light is for the altenator. It is possible that it is going out. The light comes on when the altenator is not putting out enough voltage to power the car...ie you need 12volts and it's only putting out 11 volts. the car will eventually quit running, as soon as the battery is drained to about 5 or 6 volts. the altenator can be checked. she should get back home as soon as possible.

Feb 08, 2011 | 1999 Saturn SL

1 Answer

Charging system came on in my 2004 ford explorer today is it my battery or altenator


I would have both checked out, have someone test both with a Volt Meter, your alternator should be putting out 13 to 14 volts when your engine is running and your battery should be at 11 to 12 volts when it is checked with the engine off, any less on those two numbers and I would replace either or. AutoZone will check your battery and charging system for free if you stop by.

Jun 11, 2010 | 2004 Ford Explorer

2 Answers

Having a problem with charging system new battery new alternator stll only reads like 11 volts what else can it be?


check alternator fuse and fuse link.also make sure alternator electrical wires and connector. are in good shape.

Jul 17, 2009 | 1993 Jeep Grand Cherokee

1 Answer

Eclipse battery light coming on changed altenator, computer, and is sending out 11 volts have had car in shop for month now.


Have you checked the belts ? make sure the belts are OK, usually if they are lose they won't generate the power needed...

Jul 08, 2009 | 1999 Mitsubishi Eclipse

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