Question about 2003 Chevrolet Impala

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Alternator putting out 16.5volts

While troubleshooting a "service traction system" message, I found that the alternator is putting out 16.5 volts. Assuming the voltage regulator was bad, I put in a new alternator (voltage regulator is in the alternator). The problem continued. Removed the alternator and took it to be tested, It checked good at about 14.8 volts. What could be causing the high voltage?

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  • yadayada
    yadayada May 11, 2010

    a shorted cell in the battery can cause this problem, have the battery tested.

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  • Master
  • 5,158 Answers

Or and more likely... the voltage regulator either mounted on the alternator or on the wheel well is defective.

Posted on Feb 26, 2009

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05 gmc canyon traction control power fault


First you'll need to take it to have DTC's - diagnostic trouble codes check to find out what part of the system is at fault ! Could have a sensor , control module ,or wiring problem !
Traction Off Indicator The traction off indicator, which is a LED located on the traction control switch, illuminates only when the traction control switch has been pressed and released, disabling traction control. It is important to note that a traction fault does not illuminate this indicator and that there is no relationship between this indicator and the traction fault message.
Traction Fault Message The IPC displays the traction fault message when either of the following instances occur.
?€¢
The EBCM detects a malfunction that requires traction control to be disabled. The EBCM sends a serial data message to the IPC requesting that the message be displayed.


?€¢
The IPC detects a loss of serial data communication with the EBCM


Traction Control System (TCS)
When drive wheel slip is noted while the brake is not applied, the EBCM will enter traction control mode.
The EBCM uses a 5-volt pulse-width modulated (PWM) signal to request the PCM to reduce the amount of torque to the drive wheels. The PCM reduces torque to the drive wheels by retarding spark timing and by commanding the throttle actuator control. The PCM uses a 5-volt PWM signal in order to report to the EBCM the amount of torque delivered to the drive wheels.
You would need a factory grade scan tool to check data PID's - parameter identification , all the sensors work within a specific voltage range 1- 5 volts an you can see this on a good scan tool !
The Traction control is part of the ABS system an there a several DTC possible
DTC B0827 DTC B0828 DTC B2745 DTC C0035 DTC C0035 or C0040 DTC C0040 DTC C0055 DTC C0110 DTC C0191 DTC C0201 DTC C0220-C0229 DTC C0240 or P0856 DTC C0244 or P1689 DTC C0245 DTC C0267 or C0268 and C067 or C068 DTC C0550 DTC C0899 DTC C0900
You best bet is to take it to a qualified repair shop !

You

Apr 07, 2015 | 2005 GMC Canyon

1 Answer

My 2003 impalas traction control wont shut off tried a new switch it has new hubs on it any ideas


Before replacing parts there is a specific way to start diagnostics an a professional grade scan tool is a must ! a code reader can not access the body control module , or the EBCM - electronic brake control module or instrument cluster ! All these modules communicate on the class 2 serial data bus.
Begin the system diagnosis with Diagnostic System Check - ABS . The Diagnostic System Check will provide the following information:
?€¢
The identification of the control modules which command the system


?€¢
The ability of the control modules to communicate through the serial data circuit


?€¢
The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
The traction control switch is a input to the body control module, with a scan tool hooked up an looking at BCM data ,check for conformation the traction control switch is turning on an off !
SERVICE TRACTION SYSTEM The IPC illuminates the SERVICE TRACTION SYSTEM indicator in the message center when the electronic brake control module (EBCM) detects a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination. The SERVICE TRACTION SYSTEM indicator illuminates for 60 seconds when the condition is present. The IPC sends a class 2 message to the radio in order to activate an audible warning.
TRAC OFF The IPC illuminates the TRAC OFF indicator when the following occurs:
?€¢
The electronic brake control module (EBCM) inhibits the traction control system due to a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.


?€¢
The body control module (BCM) detects that the traction control switch has been pressed (signal circuit is low). The BCM sends a class 2 message to the EBCM in order to disable traction control. The IPC receives a class 2 message from the EBCM requesting illumination. The BCM sends a class 2 message to the radio in order to activate an audible warning.

Feb 25, 2015 | 2003 Chevrolet Impala

1 Answer

Trac off light on oldsmobile alero 2001


first and most important, check your oil level...make sure it is at full and is clear (not dark).

Your conditions normally suggest an electrical problem mostly seen if the battery and or alternator is not at full operating range. Try to get a digital voltmeter and measure the battery resting (not running), it should be about 12.4 volts or higher. With the engine running, it should read 13.9 to 14.7 volts. A cheap meter can be found for less than $10 and if you need to, go to a commercial auto parts store like Autozone, Advance auto or PepBoys and they will test your battery and alternator for free.

Nov 16, 2011 | 2001 Oldsmobile Alero

1 Answer

2009 Impala won't start. First message "Service Battery Charging System" Then "Battery Saver Active" Now message reads "Service Traction Control."


turn on your car and remove the ground cable from the battery, if the car dies it's time for a new alternator, if not take your battery in to be checked. The other message(traction control) may be just due to a faulty battery/alternator.

Jul 12, 2011 | 2006 Chevrolet Impala

1 Answer

2004 Audi A6 2.7T S-Type I have a battery and/or altinator issue. Last nite the battery indicator came on in the dash (not in the center display). The volt meter keept going lower until the radio quit...


doug hard688, It sounds like you have an alternator issue here. The volt meter monitors the output of the alternator. The battery indicator will come on when you have a bad or weak alternator. When this happens you are running on the power of the battery alone and this does not last long. As you state here the radio quit working and your lights probably got dimmer with time. As far as the other lights coming on, when some systems don't have enough power to run them the lights will come on indicating a problem. I wouldn't worry about them until you have your charging system checked. You can do this yourself if you have a volt meter. Start the vehicle and put the meter's red lead on the positive terminal of the battery and the black lead on the negative side. A properly charging alternator will be putting out 13.6 to 14.6 volts. A few tenths of a volt either way out of these specs is nothing to worry about. However, a variation really far from these specs indicates an alternator problem. Good luck with this.

Jun 04, 2011 | Audi A6 Cars & Trucks

2 Answers

Dash lights and headlights are flicker on my 2000 Buick LeSabre limited. Any solutions? Also the abs and traction control light won't go off.


Traction light is on because the abs is on.Traction control needs to have the abs system fully functioning to work.Most common cause of abs light is a wheel speed sensor.As for your lights flickering the alternator may be going out or you have a poor ground connection.Would check battery cables first to make sure they are tight.

Jun 07, 2010 | 1998 Buick LeSabre

1 Answer

Traction off light on along with Service Engine soon light and ABS light


HAVE CAR SCANNED.BECAUSE PCM HAS FOUND FAULT IN TRAC AND ABS BRAKE SYSTEM.ALSO HAVE YOUR ALTERNATOR OUT PUT CHECKED. I SEEN WHERE ALTERNATOR HAD VOLTAGE SPIKES WHERE VOLTAGE WAS GOING UP AND DOWN.WHERE THE VOLTAGE REGULATOR WAS GOING BAD.

Apr 22, 2010 | 2003 Pontiac Grand Am

1 Answer

We have a prblem with the Service Traction System Light coming on also the traction off light is coming on and ABS light we have replaced both bearings on either side and the car runs light new steering...


abs pump motor control fault...dealter got parts from wrecker (lot cheaper) already spent close to $2000.00 to repair traction/abs..messages kept coming on so they finally diagnosed the above problem...we will see...

Jun 28, 2009 | 2001 Chevrolet Monte Carlo

1 Answer

1995 cadillac eldorado battery volts low


i know you dont want to hear this, ck alternator output, if it is above 13.25 your are in business any lower replace it be sure alternator is wired correct on back

shack

Apr 14, 2009 | 1995 Cadillac Eldorado

1 Answer

Service traction system message on dash


This light is usually caused by a problem in the ABS system. A problem in the ABS system will dissable the traction control system. you will need to have the computers scanned for trouble codes.


Tech JK
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Dec 09, 2008 | 2002 Chevrolet Impala

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