Question about 2003 GMC Envoy

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How many 02 sensors does a 2003 GMC Envoy have check engine light is on we have replaced 2 02 sensors like it first told us

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A "V" configuration engine, (8 or 6), uses two upper oxygen sensors and either 1 or 2 lower oxygen sensors.
If the vehicle has dual exhaust; dual all the way from the front to the end of the tailpipe, the vehicle will also have two LOWER sensors. But if the two exhaust manifolds converge into one tailpipe, you likely only have 1 lower oxygen sensor.
Check the electrical connections on the new oxygen sensors, and make certain that you have replaced your old sensors with the right type.

Posted on Aug 30, 2010

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The light doesnt tell you to replace sensors, it only tells you there is a problem, then when the code is read, it points you towards the problem, and you have to use scan data and your head to determine the fix ...so what was the code ????

Posted on Aug 30, 2010

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Posted on Jan 02, 2017

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2003 gmc envoy... I was told i needed a fan clutch.... Then. Next thing i know check engine soon, reduce engine power... Whats going on then computer... P1221, 1271, 1635 still not fix


if you were told that the fan clutch needed replacing and you did not do that , then the engine light and the loss of power would be a result of overheating of the engine and it going to limp mode
take it to a gm service centre for a explanation of the fault codes

Feb 12, 2017 | 2003 GMC Envoy

1 Answer

2003 GMC Envoy V6 - will not rev over 3000 rpms. Idle also varies 300-400 rpms. What's wrong??


Unplug 02 sensor and rap it up so bang around then take it for drive

Sep 11, 2014 | 2003 GMC Envoy

1 Answer

How to replace crankshaft sensor on 2003 gmc envoy?


The sensor is located behind the crank pulley mounted to the timing chain cover.

Jul 14, 2014 | 2003 GMC Envoy

1 Answer

After replacing the fan clutch and water pump do i have to reprogram the computer on a 2003 gmc envoy?


No! there is nothing to reprogram. The sensors in the coolant system and the temp sensor for the fans dont need to have anything done to them. If you are not getting any check engine light, you are good.

Feb 16, 2014 | 2003 GMC Envoy Xl

1 Answer

Where is the engine coolant temp sensor on gmc envoy 2004 xuv


More than likely the thermostat is stuck open. You should replace the thermostat and the temp sensor. See picture below for location.

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Apr 04, 2013 | 2003 GMC Envoy

1 Answer

I have a 2003 GMC Envoy and the check engine light comes on peridically. Auto Zone checked it and Code 0128 was the alleged issue. However, where is the sensor? No one seems to know the location of the...


This code relates to low coolant temperature not the 02 sensors. You should change your thermostat, it's stuck open and is not allowing the engine to properly heat up.

By the way, there are 2 92 sensors on Envoys and Trailblazers. One of them upstream is in the engine compartment right off the exhaust manifold, easy to replace. The other one downstream is next to the transmission drain plug in the exhaust pipe.

Oct 26, 2010 | 2002 GMC Envoy XL

1 Answer

2004 GMC Envoy check engine light remains illuminated. Diagnostics revealed codes: P1133 and P0128. P1133 points to a heated oxygen sensor and P0128 indicates a possible defective thermostat. The O2 sensor...


Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.

Jan 20, 2010 | 2004 GMC Envoy

2 Answers

I have a service engine soon light and the code that appeared when check is 1481, do you know what this means?


Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) #05-06-02-012B - (10/19/2006)

Models:2004-2006 Buick Rainier
2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2006 GMC Envoy, Envoy XL, 

Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.

This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.

Replace the wire harness: 
Part Number 89024920 Description Harness Assembly, Engine Cooling Fan Wiring

Good luck and keep me posed. 

Aug 11, 2009 | 2003 GMC Envoy

1 Answer

2003 Trailblazer loses power, I am getting codes P1271 and P1271p/d


#PIT3138A: 02-05 Chevrolet, Buick, Oldsmobile and GMC Mid-Sized Utilities Reduced Power Light On and DTC P1680 P1221 and/or P1271 Stored in the PCM - kw fan clutch SES light power MIL 4.2 LL8 - (Nov 1, 2004) 
The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.
Condition/Concern:
Reduced power light on and DTC P1680 P1221 and/or P1271 stored in the PCM 
Recommendation/Instructions:
Monitor the 5V reference to the Accelerator Pedal Position ( APP ) sensor, circuit 1274, using Peak Min/Max on a Fluke 87. Refer to Si document 1454678 for the 5V reference schematics. Command the fan clutch control "on" with the Tech 2 at 50%. If when commanding the fan clutch on, the 5V reverence spikes to battery voltage, the concern is the 5V reference shorted to battery voltage intermittently inside cooling fan clutch. Replace the fan clutch to repair this concern. 

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.
Models:
(02 - 05 Chevrolet Trailblazer and Trailblazer EXT) and (02 - 05 GMC Envoy, Envoy XL and Envoy XUV ) and (02 - 05 Buick Rainier) and (02 - 04 Oldsmobile Bravada) 

Jul 16, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

O2 Sensor


not very, but I own an 04 envoy, same engine light troubles, figured it was the o2 sensor, so I took it to my mechanic to have him tell me which sensor, so I could replace it.  Turns out the sensors are fine, but the secondary air pump is malfunctioning and needs to be replaced.  This is apparently a very common problem with this car, and I would suggest having a diagnostic ran before replacing anything, and besides, if it was an 02 sensor, there are 3 or 4 of them on the envoy and you need to know which one is failing anyway, and only a diagnostic can tell you that.

Dec 29, 2008 | 2004 GMC Envoy

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