1998 GMC Envoy - Page 5 - Answered Questions & Fixed issues


GMC Envoy Cars &... | Answered on Feb 08, 2016 | 37 views

The headlamp driver module (HDM) is an electronic module that provides electrical power to the vehicle low beam headlamps. The HDM is controlled by a pulse width modulated (PWM) ground signal from the body control module (BCM). The BCM determines the desired lamp intensity using the ambient light sensor, multifunction switch and the park brake switch as inputs. In general, the HDM will operate in 1 of 3 modes:
Reduced Intensity Mode: This mode is used by features that do not require or allow maximum low beam headlamp intensity such as daytime running lights (DRL) (nominal: 85% duty cycle).

Full Intensity Mode: This mode is used by features that require full low beam headlamp intensity such as low beam headlamp operation in manual or auto modes (nominal: 100% duty cycle).

Off Mode: This is the default mode of the system that will occur when none of the features described above are active. The BCM will deactivate its PWM output (0% duty cycle) during this mode.

The normal battery voltage input to the HDM must be between 6 and 16 volts DC to operate. Any deviation to these values could cause improper operation.
Major components of this system are the BCM, HDM, ambient light sensor, multifunction switch, park brake switch and low beam headlamps.
DTC B2575 Headlamp Control Circuit
When the body control module (BCM) senses a request for headlamp or daytime running lamp (DRL) illumination, the BCM sends a pulse width modulated (PWM) ground signal to the low beam headlamp driver module through the low beam headlamp driver module control circuit. The low beam headlamp driver module will illuminate the headlamps, adjusting the intensity based on the PWM signal received
You best bet is to take your vehicle to a ASE certified repair shop or the dealer >

GMC Envoy Cars &... | Answered on Jan 15, 2016 | 516 views

Turn Off Suspension Switch Before Jacking/Lifting Vehicle ...

repairpal.com > Problems > Lincoln > Navigator
Turn Off Air Suspension System Before Jacking/Lifting Vehicle on Lincoln Navigator. Prior to jacking or lifting a vehicle with air suspension, you must turn off thesuspension switch. The switch is generally located in the trunk or on the right side of the passenger foot well. RepairPal Verified.

    GMC Envoy Air Suspension Sensor - YouTube

    ? 4:25
    Sep 27, 2013 - Uploaded by klondikerabbit
    In this video, I am trying to diagnose and adjust the rear air suspension sensors on a 2003 GMC Envoy. The ... images for envoy where is the air suspension switch

GMC Envoy Cars &... | Answered on Nov 01, 2015 | 985 views

Code means imrc input error bank 1 don't know what that is

GMC Envoy Cars &... | Answered on Sep 14, 2015 | 70 views

Given all the electronics that are on this vehicle it could be anything ! You need to have a diagnostic scan tool hooked up , check for DTC'S , look at engine sensor data parameters ., Do some electrical tests etc.. Is the check engine light on ? Do some home work , read up on the ignition system an engine management system , fuel pressure testing etc... Computer Engine Controls Distributorless Ignition Systems DIS

GMC Envoy Cars &... | Answered on Sep 07, 2015 | 69 views

If the engine starts and runs, how can it be the fuel filter?!

The problem lies with the transmission linkage or the tranny itself.

GMC Envoy Cars &... | Answered on Sep 07, 2015 | 93 views

which circuit breaker and for what?

GMC Envoy Cars &... | Answered on Aug 14, 2015 | 62 views

Tachometer stepper motor on the back of the cluster probably needs to be replaced.
Rough Idle can be caused by many thing, but the #1 thing that causes that is a dirty throttle body. Needs to be cleaned with the battery disconnected.

GMC Envoy Cars &... | Answered on Aug 03, 2015 | 160 views

Check the cable at transmission,could be loose.

GMC Envoy Cars &... | Answered on Aug 02, 2015 | 63 views

If you have a Gm vehicle ,here's what your vehicle uses.

GMC Envoy Cars &... | Answered on Jul 30, 2015 | 56 views

It's highly unlikely that the head light washers are your draw. You will always get the spark when disconnecting and reconnecting the battery cable because you have modules still communicating. You can't do an actual draw test till the vehicle goes into sleep mode. You need to disconnect the negative battery cable and install an amp meter between the cable and the battery post and wait. Should be around 1 amp draw at first with everything off then you can watch as the modules got to sleep one by one the amperage will drop until it gets down to 20-50 milliamps. It may take up to 10 minutes for all modules to go to sleep.

GMC Envoy Cars &... | Answered on Jul 27, 2015 | 72 views

How low is low? Low compression is really vague as a diagnostic method. The issue could be leaking valves, head gasket, or rings. Yes if it is losing a lot of compression then there is no fuel to ignite and it would be a misfire.

GMC Envoy Cars &... | Answered on Jul 13, 2015 | 119 views

Go out to your car, write down the VIN from the tab visible in the windshield, or from your registration (or from the engine), and then visit this site:


Type in your vin, and you will get any and all recall information that there is for your exact vehicle.

GMC Envoy Cars &... | Answered on May 20, 2015 | 56 views

Battery light is for the alternator. Not the battery. You can have it checked at a parts store. On the vehicle. The 300 code is for random misfires, all cylinders. This could be from a bad alternator. If the alternator is not putting out enough volts, it will draw down the battery. When the voltages gets to low, misfires are the first to happen. After that things start shutting down. Eventually the vehicle will just die. The 1000 code is a relearn/drivability code. Don't worry about it.

GMC Envoy Cars &... | Answered on May 16, 2015 | 325 views

4 main things to check on your particular vehicle. 1. Check your stabilizer bar bushings, make sure there's no play. 2. Your bottom control arm bracket which hold the non-serviceable bushings is probably the culprit. 3. Upper control arm. 4. Ball joint. Most likely it's your bottom control arm bracket. Spray some silicone on each bushing one at a time to narrow down what it is.

GMC Envoy Cars &... | Answered on Apr 27, 2015 | 119 views

I googled: GMC 2002 Envoy SLE code 1221 n p1516
Buy I see no clear answer, you may find one though.

GMC Envoy Cars &... | Answered on Apr 15, 2015 | 246 views

we just dealt with this,why did you post again?didnt like my answer?? just wait and others would of seen it too,waste

GMC Envoy Cars &... | Answered on Apr 07, 2015 | 43 views

P060e Control Module Throttle Position System Performance. Service manual says to check all voltage and ground inputs to the ECM for an open circuit or high resistance. The computer will clear this code after three consecutive ignition cycles with no failures. Hope this helps out some.

GMC Envoy Cars &... | Answered on Feb 21, 2015 | 208 views

the sensor to replace is the HO2S sensor which is different to an O2 sensor. (has a different function)
code p0300 is random/multiple misfires
as misfires are from the electrical components you did not pay attention to items like low fuel pressure and faulty injectors which also cause random misfires.

GMC Envoy Cars &... | Answered on Feb 21, 2015 | 159 views

sounds like the blower doors on that side are not opening check blending door accuator

GMC Envoy Cars &... | Answered on Feb 15, 2015 | 17 views

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