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Old 03-17-2011, 03:30 PM   #1
Izzy21
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2004 ION-3 Quad Coupe
2003 ION-2 Quad Coupe
Default P0722 code wont go away!!!

Changed both speed sensors, checked the wires and they are fine. Drives great, has no speed showing on the dash and every once in a while it "loses" a gear but fixes itself after rpms go down. Im about to just burn this car!!!

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Old 03-17-2011, 04:52 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: P0722 code wont go away!!!

Check resistance of this new sensor; it should read between 800-1600 ohms with a multimeter. Be sure it isn't damaged, showing signs of cracking and the O-ring is clean and lubed for easy tightening. Then check the wiring if the sensor is ok.

The output speed sensor/VSS is used to display mph. The input speed sensor/TSS is used for the tach.
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Old 03-17-2011, 10:44 PM   #3
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Default Re: P0722 code wont go away!!!

Quote:
Originally Posted by fdryer View Post
Check resistance of this new sensor; it should read between 800-1600 ohms with a multimeter. Be sure it isn't damaged, showing signs of cracking and the O-ring is clean and lubed for easy tightening. Then check the wiring if the sensor is ok.

The output speed sensor/VSS is used to display mph. The input speed sensor/TSS is used for the tach.
I checked both sensors and they are reading a lil over 800 ohms. The wires are fine. Im at a loss for what it might be. Could it be possible that the PCM needs to be replaced?

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Old 03-18-2011, 05:12 AM   #4
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Default Re: P0722 code wont go away!!!

It's not likely to be the pcm. Gap distance may be what's causing the erratic conditions. Try tightening a bit; this sets the sensor closer to the gears that its trying to detect. Torque is 19ft-lbs. so gap setting is critical, as important as plug gaps. If you overtightened the sensor, it may be struck by these same gears..........too much gap = no detection, too little gap = scraped/damaged sensor.

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Old 12-01-2017, 09:03 AM   #5
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Default Re: P0722 code wont go away!!!

I too need a little help on this issue. I have a 2004 Ion with 5 speed auto. Code P0722 and P0700, loss of speedo, loss of pwr steering, and loss of shifting shortly after starting. Can shut off car and clear codes then restart and all is well for another minute or so. Not clear on terminology OSS vs VSS, perhaps the same thing? I have replaced the sensor on top using GM part number 24220741, verified torque and verified resistance. There is no pattern to when the failure occurs other than time (about a minute or two). Happens if parked, if going slow, or if going fast. Have not attempted a "pin to pin" wire validation, but wiring looks to be in good shape. All connectors (sensor, ECM, PCM) have been cycled and treated with an electronic terminal cleaner (and looked good).
Where to next please???

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