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Malfunction indicator lamp on

My malfunction indicator lamp came on while driving. I've noticed it's running at reduced power. what could this be?

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SOURCE: Malfunction Indicator Lamp (MIL)

I had the samething happen to my Jetta. I took it to the dealer and nothing was wrong.
I would think it's safe to drive until Monday when the VW shop opens.
My 2 cents

Posted on Jun 14, 2008

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Where is the DRL relay located?

There is no DRL relay , has a lamp control module .
The daytime running lamps (DRL) activate under the following conditions:
The ignition switch is in the RUN position.

The ambient light sensor indicates daylight.

The vehicle is not in the PARK position.

When the above conditions are met, the lamp control module (LCM) supplies battery positive voltage (B+) to the low beam headlamps through CKT 589 (GRY), the DRL resistor, and CKT 12 (TAN). The DRL resistor reduces the voltage supplied by the LCM. The low beam headlamps light at a reduced intensity. The DRL disable if the vehicle is placed in the PARK position. When the ambient light sensor indicates darkness, the low beam headlamps automatically switch from a reduced intensity to a regular intensity.
Lamp Control Module (LCM)
In the center of the IP, below the center heater outlets

Nov 17, 2015 | 1998 Oldsmobile 88

1 Answer

Push button for four wheel drive isn't working

Do you have any lights on the dash lit ?
SERVICE indicator (4WD/AWD) Lamp
The SERVICE indicator (4WD/AWD) lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD/AWD) lamp is controlled by the transfer case shift control module via CKT 1567. this system will set DTC'S if there is a problem .
Diagnostic Trouble Codes DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error you probably should take this to a repair shop !

This tt

Feb 22, 2015 | 1999 Chevrolet Silverado 1500

1 Answer

4hi worked yesturday on my 2002 envoy this morning i could only get 4low to work what could be wrong

you may have a bad switch ! i could tell you how to test it ,but could be fairly lengthy . do you own a volt meter ? do you know how to use one? should also check for dtc's in transfer case control module !
transfer case shift control switch indicator inoperative - one or more
the indicator lamps circuit consist of 5 individual lamps contained inside the mode/range switch assembly. the following lamps are contained inside the respective range button:
auto 4wd




each time the ignition is cycled, all 5 mode indicators light simultaneously, as an indicator check to ensure proper operation of the indicators. when the ignition is on, the transfer case shift control module illuminates the indicator lamp that corresponds to the current atc gear position, by providing a ground through a current limiting driver.
the transfer case shift control module flashes each indicator lamp after a shift has been requested and continues to flash until the transfer case shift control module completes the shift.
a solid state circuit, located inside the switch, supplies ignition voltage to the lamps. the solid state circuit also receives voltage when the headlamp switch is in the parklamp or headlamp position. when the solid state circuit receives voltage from the headlamp switch, the circuit reduces the voltage that is supplied to the indicator lamps, dimming the lamps when the headlamps are on.
test description
the numbers below refer to the step numbers on the diagnostic table.

  1. this step tests the transfer case electrical control of the lamp circuits.

  2. this step helps determine module failures.

  3. this step tests the affected lamp circuit for an open or high resistance.

  4. this step tests the lamp feed circuit for an open or short to ground.

these diagnostic procedures will help you to find and repair automatic transfer case (atc) system malfunctions. this service category also contains information for repairing atc system malfunctions. for best results, use the diagnostic tables and follow the sequence listed below:
  1. perform the diagnostic system check - transfer case. all atc diagnostics must begin with the diagnostic system check - transfer case. the diagnostic system check - transfer case determines the following:
  2. ?€¢
    proper service 4wd indicator operation

    ability of the transfer case shift control module to communicate through the data link connector (dlc)

    existence of atc dtcs

  3. refer to the diagnostic table as directed by the diagnostic system check - transfer case. the diagnostic tables help enable you to diagnose any atc system malfunction. bypassing these procedures may result in the following:
  4. ?€¢
    extended diagnostic time

    incorrect diagnosis

    incorrect parts replacement

  5. repeat the diagnostic system check - transfer case after you perform any repair or diagnostic procedure. this will verify that you correctly performed the repair. this will also ensure that other malfunctions do not exist.

Jan 21, 2015 | 2002 GMC Envoy

2 Answers

Malfunction Indicator Lamp

If you are not experiencing any running symptoms, you should be ok but take it in as soon as possible just in case it is serious which may end up costing more if you wait too long.

Dec 26, 2013 | 2003 Volkswagen New Beetle Convertible

1 Answer

Engine Malfunction Light...drives at reduced 40kmph

Oh you can drive it, but drive it to the shop and have the EGR(Exhaust Gas Recirculation)valve replaced. That is what's causing your lack of power. It has to work in conjunction with all other emission control systems and once it' goes bad the engine will have no power but seams to work fine otherwise. Change the EGR valve.

Dec 11, 2013 | 2009 BMW X5 3.0d

1 Answer


There are MANY engine control malfunctions that can cause the engine control system to default to "Reduced Power Mode".

Reduced Power Mode is simply a computer strategy that was created by the vehicle manufacturers to keep people from doing dumb things like continuing to operate the vehicle with the "Check Engine" or other warning lamps YELLING at them to get their car properly diagnosed and repaired. Reduced Power Mode is also designed to protect the vehicle from further damage in certain cases.

Ignoring the warning lamps can cause safety issues as well as damage HIGH DOLLAR parts like catalytic converters, which the vehicle manufacturers are responsible for due to Federal Emissions and Safety laws.

As for whether it is covered under warranty....
Many major components of your engine control system are covered under the Federally-Mandated 8-Year 80,000 mile emissions warranty. The ONLY way to find out if your particular failure is covered is to have the vehicle first diagnosed to determine what is CAUSING the failure. Then you must check with an authorized dealer to see if the part (or parts) causing the problem are covered.

May 13, 2012 | 2011 Chevrolet Impala

2 Answers

Hi, I have a 2001 VW Golf, yesterday the "Engine Emission Warning Lamp" came on, car runs normally, no misfire to the engine - but am concerned it could damage the car to carry on driving...

You will not damage anything, as the system is designed to go into 'Limp Mode' with reduced power if engine managment detects a serious fault that could compromise a emission related component.

You will notice this drop in performance and therefore seek help at your local VW shop or dealer.
If the vehicle is still running normally, then the fault is a 'soft code' or one that may be intermittent.

The lamp ( MIL = Malfunction Indicator Lamp.) can come on for any number of reasons and no drivability problems encountered. The ECU or on board computer will store the fault as a code to be extracted with a scanner plugged into the OBD port under the drivers knee panel ( USA models.)

Have a shop run a scan on the codes stored and let me know what the numbers are. Some shops can only pull power train codes and not body codes. I need to have all the codes stored so I can advise you as to your options.

One of the most common codes will be the P0300 code indicating a random miss fire. This is caused by water in the fuel, bad spark plugs, bad plug coils or engine valve problems.

Awaiting your reply.

Sep 18, 2011 | 2002 Volkswagen Golf

1 Answer

I have malfunction indicator lamp on how i can fix that

go to autozne and have them do free engine computer scan. They will tell you fault codes.

Or, try disconnecting the battery for 1/2 hour. Then reconnect and drive 10 miles. It may have fixed itself already.
MIL light on is not a big issue. only if flashing

May 25, 2009 | 2003 Honda Accord

1 Answer

Malfunction Indicator Lamp (MIL)

I had the samething happen to my Jetta. I took it to the dealer and nothing was wrong.
I would think it's safe to drive until Monday when the VW shop opens.
My 2 cents

Jun 14, 2008 | 2007 Volkswagen GTI

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