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I have a 2002 gmc envoy 4wd I used a scanner on my car and got these codes: Iso9141. KWP2000. and P0601 What do they mean? My car seems to struggle anytime I drive between 80-100 km/h especially on hills where I need more power to get up. Somedays worse than others.

Posted by Anonymous on

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: loss of engine power and difficult to start

just got my envoy back from the shop . it was loosing power strugling up hills,the thought it was the throtle body but it was infact the cat/conv,causing the throtle body to open up.yes it fixed the prob,but the converter aint cheep,go with factory part not aftermarket.the after market causes u more problems in long run

Posted on Aug 09, 2008

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  • 512 Answers

SOURCE: Engine light on Diagnostic code is P0601

it is an internal problem in the pcm....if the car is under 8years old and 80000 miles take it to the dealer for free replacement under a fed emissions standard....if over you will have to pay...it could eventually leave you stranded

Posted on Oct 15, 2008

GM Elec
  • 1000 Answers

SOURCE: My 2002 GMC ENVOY SHAKES ESPECIALLY WHEN STOPPED AND RUNNING

Is the service engine light on? If so, take the vehicle to your local Auto Zone and ask them to check your Envoy for trouble codes, write the codes down and reply back to me.
Let me know.
Regards,

Posted on May 09, 2009

Molson02536
  • 3854 Answers

SOURCE: 2005 GMC Envoy Locked in 4WD all the time

If your luck it's going to be a $15.00 vacuum switch on the transfer case that takes about 15 min to replace, if it's the electronic solenoid to the transfer case then it's going to be cost a little more and take a little longer. If your try switching from 4WD to 2WD and hear the solenoid working by hearing the cluck's when it engages and disengage then it's going to be the vacuum switch on top of the transfer case on the drivers side. Auto Zone Sell's them for $15.00 and they will have the step by step instructions to replacing the switch. They will also have the transfer case solenoid  too, if you don't hear the solenoid. Check the fuses, the fuse may have gone bad. Good luck and hope this helps.

Posted on Jun 19, 2009

johnjohn2
  • 5763 Answers

SOURCE: My 2002 GMC envoy 4wd switch lights do not light

no, you may have a bad switch or 4wd module,i ve done afew that had bad switches, but i would check it before just replacing it,

Posted on Dec 13, 2009

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1 Answer

CODE ISO9141 IN GMC; WHAT DOES MEAN?


you can google the code to find out.

Apr 08, 2017 | 2008 GMC Envoy

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My 2002 gmc envoy struggles to start, especially after sitting for 6 hours, and has to be jumped several times.


have battery and alternator tested most auto stores offer this service for free

Oct 27, 2016 | 2002 GMC Envoy

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Trying to find the reason for code p2000


The scan tool your using is generic ISO 9141 is used as the protocal. Its not a code. kwp2000 is not shown. Try and use it on manufacture specific or try and get any freeze frame codes and reply or repost. ( Don't forget to turn ignition key to the run position when trying to retrieve codes.)

Jun 05, 2015 | 2003 Nissan Altima

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What do the codes kwp2000, iso9141, and can obo2 mean?


You can look up the codes thru Google or by the OBO2 makers website

Dec 08, 2014 | Cars & Trucks

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I have a 2000 nissan maxima and its showing trouble codes kwp2000 and iso9141 the car will not turn over..what is the problem


go to www.aa1car.com and see the troubleshooting codes and what does mean.
see the diagram attached you can by pass it. God bless youe7da877d-2a0c-4982-9438-85174677d2a0.gif

Jul 17, 2013 | Cars & Trucks

1 Answer

2002 envoy code co550


you need to replace the tccm and get it programmed.


2-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)
999999995.gif Subject: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module) Models: 2004 Buick Rainier 2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2002-2004 GMC Envoy, Envoy XL 2003-2004 GMC Sierra, Yukon, Yukon XL 2004 GMC Envoy XUV 2002-2004 Oldsmobile Bravada with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)

This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
ConditionSome customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
CauseThe Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
Correction
  1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5.
  2. Remove the underhood (ATCM or TREC) TCCM fuse.
  3. Wait 30 seconds.
  4. Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
  5. Check for codes in the TCCM. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6.
  6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
  7. Verify operation and that no codes are present.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
Warranty Information

Jul 29, 2011 | 2002 GMC Envoy

1 Answer

2002 envoy 4wd problem. clicking sound comes and


Clicking sound- Possible electronic fan clutch failing. This is a typical problem with the 4.2L I6. When you hear the clicking, open the hood and listen if its coming from the fan clutch on front of the engine. this could also cause abnormal engine and transmission cooling. As for the "N" light and 4wd issue, have scanned at the dealer....Hopefully this helps

Jul 18, 2009 | 2002 GMC Envoy

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