Question about GMC Envoy

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Smog check fail

Trans ctrl system malfunction

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What is the year, make and model and what was the reason that it failed?

Posted on May 02, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1996 Nissan Maxima GXE Fail Smog Check Due To ECM System Failure

Working on one right now and hooked it up with a Snap On Solus scanner - It gives P0135 for 0/2 sensor bank 1 sensor 1. Check the 0/'2 sensor function and replace as necessary

Posted on Apr 14, 2009

  • 14036 Answers

SOURCE: 85 volvo dl fuel evaporative control functional (failed) @ smog check

replace the pvc valve and have the egr valve replace.make sure the vacuum hoses connect to egr valve and pvc replace.change air filter.all those things will cause high emission if not working properly.cause you to fail smog test.

Posted on May 31, 2009

alicantecoli
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SOURCE: Failed smpog check due to

dealer only ,,encrypted software used

Posted on Aug 17, 2009

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SOURCE: my 1995 toyota tercel failed its smog check due to the OBD system check-fail

Have the fault codes read and that will point to the faults that caused the problem

Posted on Apr 07, 2013

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I have a 1998 dodge caravan 3.3L fault codes p0500 p0700 p0720 p0715, how do I repair and replace sensors to pass smog test


Follow the links for each fault code.
http://www.obd-codes.com/p0500
P0700 Transmission Control System Malfunction
P0720 Output Speed Sensor Circuit Malfunction
P0715 sets when there is an error in the transmission's input speed sensor signal. On the front of the trans there is an input and output speed sensor that the trans controller looks at for shifting control.

While the code could have set because of a wiring or connection problem, it's almost surely the sensor. Input speed sensor failures are not uncommon.

The input speed sensor is mounted right on the front of the trans directly under where the cooler lines attach. It threads directly in and has a 1" hex for a socket for removal. If the wiring and connection look visibly ok then I would recommend replacing the sensor

Jul 06, 2016 | Dodge Cars & Trucks

1 Answer

Check engine light shows OBD fault code P0440 EVAP Ctrl System Malfunctionfree engine fault codes


code p0440 refers to evaporative emission (EVAP)system malfunction===causes--hose connections--intake leak--EVAP canister purge valve. Check all hose connections and replace the canister purge valve.. If you can locate the unit you should be able to replace it yourself

Sep 21, 2013 | Daewoo Leganza Cars & Trucks

1 Answer

My 1995 toyota tercel failed its smog check due to the OBD system check-fail


Have the fault codes read and that will point to the faults that caused the problem

Apr 07, 2013 | 1995 Toyota Tercel

1 Answer

Po336 crankshaft position sensor A range / performance


Trouble Code: P0134

HO2S-11 (Bank 1 Sensor 1) No Activity Detected

Trouble Code Conditions: Engine started, engine running in closed loop at a speed over 3 mph for more than 2 minutes, and the PCM detected the HO2S signal stroke rationality was more than the threshold value (0.250 volt) during the Heated Oxygen Sensor Monitor test.

Possible Causes:


HO2S signal circuit is open or shorted to ground.HO2S has deteriorated, is contaminated or has failed.PCM has failed.YOUR HO2S SENSOR IS BAD,IT COST 80.00,USE EXACT FIT PART.EASY TO REMOVE,DISCONNECT ELECTRICAL CONNECTOR,GET WRENCH AND REMOVE.5 MINUTES TO DO.Trouble Code: P0336

Crankshaft Position Sensor Performance

Trouble Code Conditions: Engine running and the PCM detected the number of CKP sensor signals counted (between the reference mark gap). did not equal the Actual number of available teeth (i.e., the CKP signals. were out or the normal window" of operation with the CMP sensor. signals okay).

Possible Causes:


CKP sensor signal circuit connections loose (intermittent fault).CKP sensor wiring harness has a connection fault (intermittent).CKP to Target Wheel "air gap" is incorrect.CKP sensor is damaged or has failed.Must remove to see.Trouble Code: P0440

EVAP System Malfunction

Trouble Code Conditions: Engine started, ECT sensor signal less than158?F at startup, IAT sensor signal more than 9.5?F, system voltage over 10.0 volts engine runtime 15-20 minutes at cruise speed, then returned to idle speed, VSS indicating 0 mph, load value 2.2 ms, canister load factor less than 4.0, fuel tank pressure less than 0.5" Hg, then after the Idle Control system and Fuel Trim had stabilized, the PCM detected a fuel vapor leak (as small as 0.040") in the EVAP system during the EVAP Leak Test.

Possible Causes:


Fuel filler cap damaged, cross-threaded or loosely installed.Small hoses or cuts present in the EVAP vapor hoses/lines.EVAP purge valve is damaged or has failed.Here you are the symptons.

Jan 17, 2013 | 1998 Kia Sephia

1 Answer

High nox fail smog test any remedies? 99


NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Jun 07, 2010 | 1999 Chevrolet Astro

2 Answers

'88 Wrangler w/4.2 & Auto Trans. Cat Convert


The jeep has air injection and this is part of the air pump. The cat should have two ports.. These tubes should have check valves to prevent backfire.Usually their routed up on both sides of motor and attached at the air cleaner abouts

Nov 05, 2009 | 1988 Jeep Wrangler

2 Answers

1996 Nissan Maxima GXE Fail Smog Check Due To ECM System Failure


There is no way to fix this issue according to my Nissan Dealer Service Manager. The monitors will not run and therefore the vehicle will not pass smog. If you need assistance from California's SMOG authority they are called "The Referee" and you can call them at 1-800-622-7733.

Feb 11, 2009 | 1996 Nissan Maxima

1 Answer

Failed smog test.


probably retrieved code po700/740? i believe the solenoids are above the valve body in transmission. would leave this repair to trans shop.

Dec 11, 2008 | 1998 Pontiac Firebird

1 Answer

2001 Sonata V6, Smog failed - high NOX


if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

Aug 19, 2008 | 2001 Hyundai Sonata

1 Answer

I will do the best I can. I have a Chev Metro LSI 2000 Automatic. The Service engine yellow light on. My Gear Shift is locked in Park. I can move the yellow level that releases the Shift out of Park. I...


code p 0705 refers to transmission range(TR)sensor /switch PRNDL input--circuit malfunction===causes ---wiring---TR sensor /switch---ECM/TCM ( transmission control module)
take it to an accredited transmission professional repair specialist and have it checked out
the first place I would be checking is the wiring and harness connections

May 15, 2017 | Chevrolet Metro Cars & Trucks

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