Question about 2002 GMC Envoy

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2002 gmc envoy, no start with key. new ignition switch, new neutral safety switch, new pcm reprogrammed at stealership, battery is charged, all fuses checked AND double checked, new starter relay, all dash lights work...cleaned all the grounds i can find. everything functions as it should except it does not start. any ideas where to start to look? it will start if i jumper wire the starter but then the turnsignals and various other things wont work since it doesnt know its running. lock cylinder was cleaned and tried 2 different keys. HELP!

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2002 envoy fan clutch went out replaced it does

I'm taking my 2001 yukon Denali to the mechanic to fix a potential wheel bearing problem. Is it expensive to fix them?

Posted on Jun 08, 2009

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cincinaty5
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SOURCE: 2003 Dodge Caravan 3.3 No Crank, No Start

replace the neutral safty switch

Posted on Aug 28, 2009

  • 1374 Answers

SOURCE: 2002 GMC Envoy, i put the key in ignition and

Ignition switch and neutral safety switch. Next time it happens wiggle thekeys in the ignition switch and try to restart.If it starts its probably the ignition switch. Then locate neutral safety switch on brake pedal and put meter on B+ wire from switch to starter relay and see if you get B+ on the would -be- crank. Next locate B+ wire from starter relay to starter hook a meter to it and see if you get B+ on the would -be crank.
Where ever B+ is missing is your problem.

Posted on Apr 14, 2010

bbl242003
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SOURCE: 1999 yukon wont start. starter works. new relay.

Does this bad boy stay inside a garage or out in the open? what is the temp at night at your location?

Posted on Jan 13, 2011

dttech
  • 4803 Answers

SOURCE: what wires do I need

The wires on the Transmission Range Sensor that control the ability to crank the starter are the BLACK/GREEN wire at Pin 6 and the wire at Pin 10 which is either BLACK/GREEN or BLACK WHITE depending on your model. (build - date and transmission type)

With all that said, I think it only fair to warn you that bypassing these wires will set codes in your Engine Control Module. It is not going to like it if there is power at pin 10 with the transmission in reverse or any of the forward gears. This may also cause your transmission to not shift properly because the ECM will not know for sure what gear you are in.

Posted on May 10, 2011

Testimonial: "thanks so much for the information I will install a switch and only use it when needed and to ensure that this is my problem."

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I have a 1993 gmc sonoma, put a new ecm in it but it willn't tern over,lights will com on tho an if i cros the starter the plugs wont fiyer


The problem is in the start circuit if the starter won't engage from the key. From battery to ignition switch to neutral park safety switch to starter relay to starter solenoid to starter to ground and back to battery-lights come on so switch is good, next check the neutral safety switch for power in and power out.
Once you get the start circuit working so starter engages from the key, then you can address the ignition circuit for possible no spark.

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2004 Envoy XUV doesn't always crank.


I want to see if i catch your drift ! When you turn the key in the ignition switch to start , nothing happens ? Have you tried moving the gear slector to the neutral position to see if it starts then ? Park neutral safety switch problem , maybe .
Here is a description of how it works or how it's suppose to work .
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.

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1 Answer

My 02 Bonneville is having problems starting. When I turn the key nothing turns over... the radio comes on but nothing else will happen. At first if I waited 10-15 minutes it would start right up now it...


When you turn the ignition switch to start ,it sends 12 volt input to the PCM - engine computer . The PCM will then energize the start relay in the under hood fuse / relay distribution box.
Here is factory service info.
Circuit Description
Moving the ignition switch to the START position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows battery positive voltage to the starter solenoid S terminal.

Try moving the gear selector to the neutral postion when it fails to start . To eliminate or confirm the park neutral safety switch as the problem . Are any lights lit on the insturment cluster ? Check engine , security ?

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2 Answers

Where is the relay and/or in line fuse for the back up lights on a 2002 GMC Envoy. New bulbs and fuses are fine in both fuse boxes. Still not working so there must be a in line fuse or relay out?


check the neutral safety switch. connected to the shift lever, keeps you from running the starter unless in park or neutral, AND it turns on the back up lights when in reverse.

Jun 27, 2011 | 2002 GMC Envoy

1 Answer

How do you replace an ignition switch on a 2002 chevy venture van? I have a 2002 chevy venture van and have had a problem with the starter staying engaged. I replaced the started and it fixed it...


So what it only does it in park or neutral ! The vehicle starting circuit is only suppose to let it start in park or neutal . Park neutral safety switch won't allow B+ voltage to S terminal on the starter solenoid unless the vehicle is in park or neutral . It's probably the starter relay contacts stuck closed . You really should learn how it works before guessing as to the problem . Plus learn automotive electrical testing ! The ignition switch when turned to the start position send's a voltage signal to the PCM - engine computer .The PCM will energize the starter relay to crank the engine . PCM / ABS 10amp fuse in the I/P fuse box supply's B+ voltage to the park / neutral safety switch . When in park or neutral the B+ voltage goes through the control side of the relay to the PCM which will supply a ground to energize the starter relay .

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1 Answer

Recently had water spill in truck now truck will not start, 2002 gmc envoy. heated seats dont work, when turn key all dash lights come but not click or start. do you know what it can be? Replaced body...


check fuses... get a 12v test light & see if getting voltage to starter. did you charge battery? check battery connections. did you spill water one cup? 500 gallons?in console? on engine? on ignition switch?

Sep 15, 2010 | 2002 GMC Envoy

1 Answer

2002 GMC Envoy, i put the key in ignition and vehicle will not start sometimes and other times is starts fine. we have checked the starter, battery and battery connections, all fine. Changed the starter...


Ignition switch and neutral safety switch. Next time it happens wiggle thekeys in the ignition switch and try to restart.If it starts its probably the ignition switch. Then locate neutral safety switch on brake pedal and put meter on B+ wire from switch to starter relay and see if you get B+ on the would -be- crank. Next locate B+ wire from starter relay to starter hook a meter to it and see if you get B+ on the would -be crank.
Where ever B+ is missing is your problem.

Apr 14, 2010 | 2002 GMC Envoy

1 Answer

My 2002 GMC Envoy wont start. I have had it on the battery charger for almost an hour. When I turn the key I get interior lights and headlights and the dash board lights up to. But nothing from the...


try car to car boost-battery charger may not be working correctly or set on low amp charge -interior lights and dash may all light but battery may not be strong enough to energize starter have battery tested if battery good than check for power to the starter if power-- starter may be shot can remove also and have tested at most auto stores free if no power battery -wiring-or connection issue would need to test fuse panel-ignition switch and starter solenoid

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4 Answers

2002 GMC Envoy


If your 2002 gmc envoy or sierra will not even turn over with a kown good battery try starting it in nuetral then go back to park and try starting again. There is a park nuetral safety switch that can malfunction. Turn the key on then shift into nuetral, then turn fully to start.
 

May 19, 2008 | 2002 GMC Envoy

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