20 Most Recent 2002 GMC Envoy Questions & Answers

Question edited for clarity and typos, wrong type of break vs brake The only thing different is the Master Cylinder, so it won't be the proportion valve or the brake line. There is a fault with the master cylinder. This link tells how to test.

Brake Dragging Condition After Master Cylinder ...

Brake & Front End https://www.brakeandfrontend.com > brake-dragging-... Jun 23, 2016 - This is most likely due to the pedal mechanism or booster pushrod keeping the master cylinder slightly applied, impeding the capability of the ... Lots more help here and videos as well. https://www.google.com/search?q=2002+GMC+Envoy.+Master+Cylinder+replacement+now+front+brakes+are+seizing ..

There is a module that controls the air bags called the SDM Sensing and Diagnostic Module, but the air bags themselves are called modules. If they are referring to the SDM...



(1) Lower Console
(2) Inflatable Restraint Sensing and Diagnostic Module (SDM)


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I would look to the blend door actuator. Sounds like the left side has an issue.

Try to google images and what you are looking for. possible picture and or diagram.

I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.

74 ft/lbs

if your outside temp is wrong on your 2002 Envoy here is how you fix it. part number 15047946 sensor. looks like the wrong part..it's not. take the brace part off of it by pressing the clips and slide out the part you need. Loosen the 4-5 bolts from the top of the grill..attached to brace right on top of the grill..just pull the grill out about 3 inches..put your hand thru..it's driver side to the middle. original is grey box with connector. pull it out, reattach connector to new part and push the new piece in the hole..get the piece from the dealer..25.00...put screws back in grill brace. reset the temp by pressing front defrost, rear defrost and mode all at once. took me 15 minutes..and I'm a 55 year old girl:) you can do it!

you see those fuses, pull/replace them one at time till you pull the fuse that kills the blower motor, then we go from there. see the 40 amp fuse on the left, that is for hi speed. The two middle fuses should only go hot with the key on. Everything off and key out use a test light to check voltage at those two fuses, shouldn't be hot? I can only help with testing. I'd hate to tell you to replace something and it not fix it.

Are both heater hoses going into the heater core hot . Heater hoses from the engine go into the fire wall an into the heater core . Do you know what these are ? Is the coolant level full ?

4.2L Engine the thermostat and the neck where the hose goes on is one unit $25 at autozone

1. Remove the necessary coolant from the radiator.
2. Remove the alternator, Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
3. Remove the thermostat housing bolts.
4. Remove the thermostat housing from the engine block.
5. Clean all of the surfaces of the thermostat housing.
6. Clean the sealing surface of the engine block.

There may be four. Bank 1, sensors 1, 2 and 3 and bank 2 sensor 1. This link will help you find the sensor that you need. https://www.youtube.com/watch?v=vAxuP9UVQPs

The service and repair manual with diagram will provide step by step help to locate and fix the problem on your own easily and you will get the manual from the given link Home Toolsnyou https://toolsnyou.com/

check connectors fuses and relays ----also check the connections ribbon connections and unit under rear seat drivers side --lift seat like your going to fold down

Your anti-theft system kicked in for some reason. If you shut it off, the engine will turn over but will not start. A Chevy or GMC dealership is usually required to reset the system, but you'll have to bring it to them. Dealer + Towing = BIG $$$$. A less expensive option would be a mobile mechanic (call them first) or a licenced locksmith. Either way you'll need to show ID and proof of ownership.

The best way to fix the problem is getting help from service and repair manual with pictures and diagram which will give you step by step help to locate and fix the problem on your own and you will get the manual from the given link https://toolsnyou.com

Maybe you are actually running out of fuel ,gas gauge is showing 1/4 of a tank when it is really almost empty . Would not have anything to do with the fuel filter , if it did it would happen when full also .

Did you check the fuse ? Do you hear the wiper motor running ? If the fuse is good you would need to test the electrical circuit for the wiper motor ,viewing a wiring diagram an then use a DVOM - digital volt ohmmeter to test What body type is it ? Vin 6 or 3 could have a circuit breaker for power supply or fuse ,both are located in the rear fuse block . Rear Wiper/Washer System Components The rear wiper/washer system consists of the following components: • Rear window wiper motor • Rear window washer fluid pump • Rear wash relay • Rear window wiper/washer switch • RR wiper 15A circuit breaker • WASH 20A fuse Rear Wiper/Washer System Controls • Body control module (BCM) • Liftgate control module (LGM) • Rear wiper/washer switch Here is how it is controlled Rear Wiper/Washer System Operation The rear window wiper/washer switch is an input to the BCM. The requested rear wiper mode is sent to the liftgate control module (LGM) by the BCM as a message on the serial data circuit, and the rear window wiper motor is controlled by the LGM. The switch power circuit to the rear wiper/washer switch is a 12-volt reference supplied by the BCM during ignition on, accessory or RAP power modes. The rear wiper/washer switch is a series of resistors and the switch position is determined by the voltage of the rear wiper/washer switch signal circuit to the BCM. The rear wiper/washer switch has continuity at all times and the BCM expects a rear wiper/washer switch signal voltage in all switch positions including OFF. The rear wiper motor is supplied battery positive voltage and ground. The LGM controls rear wiper motor operation through the rear wiper motor control circuit. The rear wiper motor control circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the LGM. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode. The liftglass and liftgate ajar switches are inputs to the LGM and must be in an inactive state in order for rear wiper washer system operation to be enabled. When an ajar switch is active the LGM suspends wiper motor operation directly and sends the ajar switch status messages over the serial data circuit enabling the BCM to suspend washer pump operation. The rear window washer pump is controlled by the BCM through the rear washer relay. Battery positive voltage is supplied to the coil and switch sides of the rear washer relay. When the rear window wash request is active the BCM energizes the relay by grounding the relay coil through the rear washer relay control circuit. When the relay is energized battery positive voltage to the relay switch is supplied to the washer pump control circuit. Your best bet mite be to have a qualified repair shop check for codes in the BCM or LGM -------------------------------------------------------------------------------- DTC B1017 or B3970 The rear wiper motor is supplied battery positive voltage and ground. The liftgate control module controls rear wiper motor operation through the rear wiper motor control circuit. The rear wiper motor control circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the liftgate control module. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode.

Nothing you can do , have it towed to a qualified repair shop.

Yeah , P1234 or B1234 An it want or won't start . You need factory service repair info.to know what this is . For all codes there is a diagnostic trouble shooting procedure . Without this info your best bet ,have it towed to a qualified repair shop. 4WD - 2WD . If P - powertrain code factory info doesn't show this code . What cheap code reader are you using . It's not telling you the correct code . Cheap code readers will do this. Your best bet , take it to a qualified repair shop.

I don't know but my first check would be on youtube.