Question about 2003 GMC Yukon XL

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Stepper motors how did you remove stepper motors and can you just swap them becaulse they are the same

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Good day,
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Posted on Aug 02, 2010


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I replaced iac sensor and it still shows bad.

Have to check powers and ground curcuit.

Idle Air Control Motor Circuit Malfunction Possible Causes Setting Conditions • Stepper motor connector is damaged (check pins for damage, and moisture) • Stepper motor Coil 1, 2, 3 or 4 circuit is open or shorted to ground • Stepper motor coil circuit(s) is shorted to voltage • Stepper motor has failed • PCM has failed Engine running; system voltage over 11.5v, and the PCM detected an incorrect voltage on one or more of the IAC motor circuits for 2.75 seconds with the motor enabled.

May 22, 2015 | 2002 Chrysler PT Cruiser


Saab 9 5 Drivers Side HVAC Blend Door Problem

DIY Saab 9 5 Drivers Side HVAC Blend Door Problem Subject: DIY Saab 9 5 Drivers Side HVAC Blend Door Problem Title: How to fix the Blend Door
This is a known problem where a plastic part fails that causes the Drivers (or passengers) side blend door to stop operating and will remain in the hot or cold position. To test if this is the problem, with the car running, calibrate the HVAC by pressing the AUTO and OFF buttons on the HVAC controls. If an 8 appears on the driver’s side (or passengers) this is probably the problem. The plastic stop arm is designed to stop the stepper motor for the blend door. When this fails the stepper motor has enough power to break the internal shaft from the motor to the door.
The fix is to obtain two plastic replacement parts and install.
Air will not move to hot or cold when the other side does. HVAC calibration will fail with an 8 code on the side in question.
Mechanic level: Easy / Medium
Basic torx, socket, Phillips tools
About 1 hour, much less if you have done this before
12765865 Plastic replacement for inside failed shaft about $18 5334701 Plastic replacement for stop arm about $25
1) Remove the driver’s side under dash panel
a. Remove the 3 torx screws
b. Remove the plastic push holder from the panel, push in the center a bit, remove it
c. Pull out the panel slowly
d. Remove the two torx screws from the diagnostic terminal
e. Remove the panel from the car
f. You will probably find the failed stop arm falling to the floor
2) Remove the stepper motor, this is located next to the center of the car to the right of the steering column (states). You can identify it because it will have two white wire terminals that go to it. You will probably have to lay on your back and look to the left.
a. Remove the air sensor from the duct by carefully pulling back the two black clips. This is a pin like sensor that does not detach from the white wires
b. Remove the stepper motor wires but squeezing on the top of the white connector and remove upwards, but it aside
c. Remove the stepper motor be removing the two Phillips / hex head screws. The one on the bottom is easy, the one on the top will require a long Phillips, or you can use a ratchet with a 6mm socket.
d. Remove the stepper motor and put aside.
e. Sometimes the internal shaft will not fail, you can check this out by turning the yellow shaft that the stepper motor shaft was in. If it is very flimsy, it will have to be replaced.
3) Remove the failed plastic shaft
a. This will not remove directly and some other instructions say to remove the down assembly. I ended up pushing the shaft in and if fell out after a few operations of the blend door after reassembly.
4) Replace the new shaft and stop arm.
a. Put the stop arm on the replacement shaft and put back in. This cannot go in wrong, make sure the stop arm is in the opening to the top.
b. Turn the shaft arm and you can feel the blend door moving.
5) Replace the stepper motor
a. You may have to play with this a bit, but it will set in the new shaft.
b. Replace the two screws
c. Plug the wires back in
6) Replace the sensor
a. Carefully put back where you took it out
7) Test the system.
a. Start the car
b. Calibrate the HVAC, AUTO/OFF, there should be no 8 or other codes.
c. You may have to do this a few times, the old yellow shaft should drop out.
8) Replace the under dash cover
This was done on a 99 9-5 sedan. There are a few other issues that may cause this problem. The stepper motor failing (rare), or the stepper motor gear coming loose. Most of my time was wasted trying to get the old shaft out the realizing that it does not come out.

on Jan 17, 2010 | Saab 9 5 Cars & Trucks

1 Answer

Stepper motor poor performance

You will have to remove the stepper motor/IAC and clean the carbon off it and the TB.

BTW, what makes you think the IAC is bad? Rough idle?

Jan 30, 2015 | Mitsubishi Lancer Cars & Trucks

1 Answer

How to remove stepper motor and where it locat on 1995 Lexus es 300

On the throttle body

Usually T-20 Torx Screws

I don't know if you can get one

I would say 70 % of vehicles, you
have to buy throttle body

You could get one from a salvage yard-- verse--
the $700.00 for the whole thing & them swap
out the motor

Just because you have codes, does not mean it is bad

Many things can give you those codes,try cleaning the throttle plate

Jul 30, 2014 | Cars & Trucks

1 Answer

Tachometer registers sparadiclly

The gauges in the instrument cluster are driven by stepper motors, sometimes these motors go bad. More than likely your tachometer problem is caused by a bad stepper motor. If you are handy, the instrument cluster can be removed and sent out to a repair center. Check on Ebay for repair persons.

Dec 15, 2013 | 2003 Chevrolet TrailBlazer

1 Answer

2003 Buick Rendezvous fuel gauge not working problems It says empty when full, it comes off and on.

You may have two issues here. The sending unit in the fuel tank maybe bad or you have what they call a stepper motor that is behind the instrument panel. It controls the guages. Every guage has one stepper motor. This is a job that would require mechanical knowledge. You would have to remove the bad stepper motor and re solder a new one in its place.

Jun 10, 2011 | 2003 Buick Rendezvous

1 Answer

My oil gage in my 2004 envoy goes all the way over to the right past the indicator and stays there when I start up the truck.

The gauge is driven by a stepper motor in the cluster, these have been known to go bad. If you are handy and can work with a soldering iron, you can replace the stepper motor yourself. If you go to and do a search for stepper motor replacement you will find a write-up to do the job. The steeper motors are available on E-bay. If you can't do the work, but can remove the cluster from the dash, there are vendors on E-bay who will replace the motors.

Jan 27, 2011 | 2004 GMC Envoy

2 Answers

Needle sticking or not reading correct speed

Speedometer cluster is defective. Many GM oproducts used stepper motors in the speedometer cluster. speedometer, gas gauge, tachometer etc what ever is a movement indicator.

Do not purchase a used one or one that is "repaired" if the stepper motors are not replaced with motors made after 2005. repaired units cost a few hundred dollars. individule stepper motors can be purchased on EBay for less than $10.00 each. The cluster must be removed from the vehicle and dismantled carefully, knowing it is electrical device and may be damaged by static electricity. good luck!!

Jan 13, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

My service engine light is on. and I took it too autozone to be checked and got the results: Large vacuum leak on engine, 2. throttle body condition-dirty and faulty IAC valve/throttle. what does this...

These are all things that can affect your gas mileage and engine performance.

To check for vacuum leak, look for unhooked hoses on top of engine. If OK, use starter fluid and spray along intake manifold gaskets with engine running. If engine speeds up, there is a leaking gasket.

IAC deals with idle. Does the car idle smoothly? If not, remove IAC to see if it's dirty. I will paste instructions below for the IAC valve.

Throttle body dirty--what code is this? never heard of such a code, but you can clean the throttle body wioth carb cleaner. I will paste instructions below.

IAC valve info:

Operation The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle valve. The servo valve is opened or closed by the activation of the stepper motor (incorporated within the idle air control motor in the forward or reverse direction. Battery positive voltage is supplied, by way of the MFI relay, to the coil of the stepper motor. The engine control module switches ON the power transistors (located within the engine control module) in sequential order, and, when current flows to the stepper motor coil, the stepper motor is activated in the forward or reverse direction.

Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the electrical connector at the sensor.
  3. Remove the sensor from the throttle body.
To install:
  1. Install the sensor in the opening in the throttle body and tighten the sensor.
  2. Attach the electrical connector to the sensor.
  3. Connect the negative battery cable.

Checking Coil Resistance

  1. Disconnect the idle air control motor connector and connect the jumper (test harness).
  2. Measure the resistance between terminal (2) of the connector at the idle air control motor side and terminal (1) or terminal (3). Standard value: 28-33 ohms at 68°F
  3. Measure the resistance between terminal (5) of the connector at the idle air control motor side and terminal (6) or terminal (4). Standard value: 28-33 ohms at 68°F
  4. If not within specifications, replace the IAC Valve.
  5. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
Checking Operation Sound
  1. Check that the operating sound of the stepper motor can be heard over the idle air control motor when the ignition switch is turned to the ON position (without starting the engine).
  2. If no operating sound can be heard, check the stepper motor drive circuit. (If the circuit is good, a defective stepper motor or engine control module is suspected.)

    IAC picture--mounted on top side of engine.
      Throttle body--loosten clamp to right of throttle body and pull hose off. Use electric parts cleaner or carb cleaner--spray on dirt with engine running. don't touch any sensors inside throttle body--sensors are delicate.

    Oct 11, 2010 | 2005 Mitsubishi Endeavor

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