Question about 2000 Audi A4

2 Answers

Battery indicator after new alternator Audi A4

2000 Audi A4 1.8
Battery indicator came on and voltage dropped to 10V. AAA tech used portabel diagnostic indicator and determined alternator was bad. Car did run with a jump although at 10V. Towed to AAA certified mechanic. They replaced alternator. Voltage back at 14V for a few miles then battery indicator came back on. Voltage now at 12V. Do I need a battery? Is there a voltage regulator in the Audi? Could it be the alternator was not bad after all? I just want some knowledge before I talk to the mechanic about it.

Posted by on

  • 3 more comments 
  • pdu111 Jul 02, 2009

    I believe the alternator was a high quality remanufactured unit. Cost me about $490 for the part. I just talked to an Audi service person who said they dont see many alternators or voltage regualators go bad but batteries are usually the culprit.

  • pdu111 Jul 02, 2009

    Its a Bosch alternator $490. The battery has a date of 2004. How many years should the battery last?

  • Marvin
    Marvin May 11, 2010

    anything is possible, was a new alt used or a rebuilt? have the system retested

  • Gervacio Magalong
    Gervacio Magalong Aug 16, 2016

    I am having this same problem. Old alternator died and was reading 8v at the battery.

    Installed new one from advanced auto, read 14v after install. After about 25 miles it now reads 12v when running and not charging.

    How did you fix your issue?

  • Gervacio Magalong
    Gervacio Magalong Aug 16, 2016

    I am having the same problem. Old alternator when running tested at 8v so I replaced it with one from advanced auto. Measured 14v and charging after install. 25 miles later it now reads 12v and is not charging the battery. I have replaced both grounds (one up top and the other from engine block to body) still reading 12v

    I am desperate. How did you fix yours, I dont want to shell out $600 for one from Audi only ot be in the same spot!



2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 110 Answers

Check the little wire that attaches to the back of the alternator it could be broke or hooked up wrong the wire should be connected to the passenger side prong

Posted on Nov 22, 2016

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,392 Answers

Take it to an Audi dealer. Could have been a bad alternator, and another bad alternator if they didn't use Audi part. Don't use cheap rebuilt Chinease stuff on your Audi.

Posted on Jul 02, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

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

2 Answers

Voltage drops when setting still has new battery and alternator

Check grounds. Look at your cables. Could be corrosion.

Oct 30, 2015 | Cars & Trucks

1 Answer

I have a 2000jeep Cherokee limited. When I crank

which engine, we can not guess engines here. not ever. (rare)
this is called a XJ car.
2.5l or 4.0 liter or the Diesel????

ok electrics 101.
all electronics and electrics have a rule
of power is low, things go nuts.
its like not eating and blood sugur drops then you drop.
same deal;
each part has a rule for this but im not going there, (can but wont)
the starter goes dead at 8v
if the battery is weak many electronics goes nuts at below 10v.
varies by year and make of car and all options on the car.
for windows, IM NOT GOING THERE> way too complex of topic that.
(mix of parts)
so when the door goes nuts, what is the battery voltage
a tech, uses a voltmeter,
walmart sells one for $10 in auto and in the elect. department.

is the battery too low, cranking?
here are the 3 rules for the battery after cleaning posts.

1: charged battery rested , is 12.6v. not in siberia , summer temps.
2: running engine battery voltage is 13.3 to 15v, if not the battery drains.

3: cranking, most books show 11v. but if not below 10v your ok
most the time. but who knows, that? nobody on earth.

why not use booster jumper cables to a running other car AAA STYLE?
if the noise goes away, then may be ,
the battery is low
battery discharge
or battery is weak (bad)
or you have parasitic drains.
or the charge system is bad.

KEEP IN MIND i cant hear it. so... all my answers will sux.

Sep 27, 2014 | 2000 Jeep Cherokee

1 Answer

1993 Jeep Wrangler charging problem

nothing wrong with the ECM unless it has the voltage regulator as part of the system
indicates faulty wiring and faulty alternator
have a load test done on the battery
have an auto electrician do a full charging system check
charging voltage should be 14.5-14.8 volts DC
battery voltage should be 12-13.5 volts dropping to 11 volts when cranking the engine
make sure that the drive belt tension is correct and the belt is in good condition

Dec 22, 2017 | 1993 Jeep Wrangler

1 Answer

2001 Cadillac DeVille RPMs revving dying

battery not charging , means the charging system is not working , Doesn't mean the battery is bad . The charging system on your vehicle is computer controlled , If the BCM doesn't see the correct voltage , it will raise the idle RPM to over come any load on the system . Probably has DTC'S - diagnostic trouble codes stored in the BCM or PCM , These codes do not always turn on the money light ( check engine ) . Your best bet , take it to the Cadillac dealer , auto zone or any of those has no clue about this . Oh also it will shut down systems .
Battery symbo - Charging System Indicators

BATTERY NOT CHARGING - 7Charging System Indicators

The IPC illuminates the BATTERY NOT CHARGING - 7 indicator in the DIC when the PCM detects a malfunction with the generator output. The IPC receives a class 2 message from the PCM requesting illumination.

I work for Cadillac , have for over thirty year's . Have seen people mess this stuff up big time . So do yourself an take to one of my fellow tech's.

Electrical Load Management
The power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high discharge condition. This is accomplished by using a high accuracy battery voltage reading as an indicator of battery discharge rate. The following six levels of load management will execute in the load management control algorithm when there is a high discharge condition:
The first action requests a vehicle idle speed increase to the powertrain control module (PCM) in order to raise alternator output.
The second action requests a greater vehicle idle speed increase to the PCM in order to raise alternator output.
The third action begins to shed vehicle loads in an attempt to remedy the heavy discharge condition.
The fourth action requests another vehicle idle speed increase to the PCM in order to raise further the alternator output.
The fifth action begins to shed further vehicle loads in an attempt to remedy the heavy discharge condition.
If the above five corrective actions fail, the sixth action of power management further sheds loads in a final attempt to remedy the high discharge condition.
Loads subject to reduction include the following:
• The A/C clutch
• The heated mirrors
• The heated seats
• The rear defog
• The HVAC blowers
The power mode master (PMM) calculates the battery temperature, voltage and charging rate at all times while the engine is running. The PMM calculates the battery temperature by factoring in:

Mar 18, 2017 | Cadillac Cars & Trucks

3 Answers

2000 chevy silverado. alternator problems. start truck and meter shows about 11 to 12 amps for a few minutes then goes up over 14. Did this for several days. today started and went right to 14 amps then...

amps or volts
11 to 12 amps indicates nothing but if it is volts then it indicates that the alternator is not charging the battery
Battery voltage is 12 -13.5 volts and when charging is 14.5-14.8 volts dc
the rest of your statement indicates that the alternator or voltage regulator is faulty and you should have the charging system checked by an accredited auto electrician

Feb 26, 2018 | Cars & Trucks

1 Answer

My 86 Audi 5000 CS Turbo has quit running while driving but at stop signs or stop lights with no indication of anything wrong. When I try to start it again the battery is dead. I've bought batteries...


Sep 04, 2011 | 1986 Audi 5000 CS

1 Answer

Sometimes my battery light comes on and then goes off after a minute or so, sometimes stays on for a long time. I managed to get home without it coming on once which was about a 25 minute dirve, but I...

Here is a simple test to determine the condition of the battery and alternator.
First, make sure the battery posts are clean and the cables are in good shape.

Using a volt meter, check standing battery volts at the posts, with nothing in the car on.
Lets say 12 to 13 volts is good. If standing battery voltage is way less than 12 volts the battery is probably bad.
Now start the engine, make sure no electrical items are on and check the battery voltage at the posts again. This reading should be 1 to 1.5 volts higher than the first reading.
If there is little or no change, or less volts then the alternator is bad.

Just for fun, while the engine is running, turn on the things you normally have on when driving and check the voltage one more time. If volts continue to drop, then without a doubt its the alternator.
Hope this helps.

Aug 04, 2011 | 2000 Dodge Neon

1 Answer

My 94 lexus es 300 the engine light stays on n sometimes my battery light comes on wat does tat mean

Hi, the engine light is indicating that the computer has detected a fault. You will have to extract the trouble code to determine the fault. Go here for instructions on diagnostics:
Please get back to me with the results/trouble code for assistance in resolving the fault.

The battery light may be indicating a weak alternator. Check the voltage at the battery with the engine idling. If the voltage is less than 14 volts, replace the alternator.

Mar 16, 2011 | Lexus ES Cars & Trucks

1 Answer

1999 f250 will not charge battery

It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

Aug 10, 2008 | 2000 Ford F250 Super Duty Crew Cabs

Not finding what you are looking for?
2000 Audi A4 Logo

Related Topics:

935 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

81294 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14423 Answers

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

Answer questions

Manuals & User Guides