CEL code P0722 - Output Speed Sensor
08-28-2014, 11:56 AM
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CEL code P0722 - Output Speed Sensor
I have a 2006 with CVT and I am getting CEL code P0722 - Output Speed Sensor No Signal
Research suggests this is the TCM going out. I don't have $2k to spend on a full TCM right now. Is there anything I can do about replacing just the sensor so I can pass inspection?
On the table is just resetting the light and trading it in, but I am way upside down in this car due to low trade value.
Research suggests this is the TCM going out. I don't have $2k to spend on a full TCM right now. Is there anything I can do about replacing just the sensor so I can pass inspection?
On the table is just resetting the light and trading it in, but I am way upside down in this car due to low trade value.
08-28-2014, 08:13 PM
#2
This issue has come up on the A6 Allroad forum a few times, if you do a search there. Before assuming its the TCM, you could just try replacing the sensor and resetting the error.
A lot cheaper and if the alarm does not return then it was just the sensor.
I replaced my sensor on the Allroad about 6 months ago, all good now.
A lot cheaper and if the alarm does not return then it was just the sensor.
I replaced my sensor on the Allroad about 6 months ago, all good now.
08-29-2014, 08:02 AM
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This issue has come up on the A6 Allroad forum a few times, if you do a search there. Before assuming its the TCM, you could just try replacing the sensor and resetting the error.
A lot cheaper and if the alarm does not return then it was just the sensor.
I replaced my sensor on the Allroad about 6 months ago, all good now.
A lot cheaper and if the alarm does not return then it was just the sensor.
I replaced my sensor on the Allroad about 6 months ago, all good now.
08-30-2014, 06:22 PM
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I believe it's inside the transmission housing and that means opening it up. Might as well swap the tcm while you're at it. If you clear the the code you'll probably just have it reappear as soon as you drive.
If you want to try it, there's a company on ebay that reflashes tcms. I'd contact any company first with questions before you go through with this. You're still going to have to get it removed and install it later.
If you want to try it, there's a company on ebay that reflashes tcms. I'd contact any company first with questions before you go through with this. You're still going to have to get it removed and install it later.
09-01-2014, 07:02 PM
#5
The output speed sensor I am referring to is on the outside of the bell housing. If you can picture where the flywheel would be in the bellhousing, look for a black sensor with a single small bolt and a 2 wire electrical connection at 90 degrees. The sensor looks similar to the cam speed sensor in appearance, its a tube about 25mm (1 inch) long, 20mm (3/4 ") round (from memory). On the A6 it was on the left side of the transmission sort of 5 o'clock if you were looking in the engine bay from the front, on the A4 (6 speed manual) I recall it was on the right side about 10 o'clock. It's well hidden due to the crossmembers so you have to be a bit of a contortionist to get at it. There is a you tube segment where the guy uses a mirror to see it. These are sealed units so it's about $60-$80 sender unit depending on the part number.
12-06-2014, 08:41 PM
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The output speed sensor I am referring to is on the outside of the bell housing. If you can picture where the flywheel would be in the bellhousing, look for a black sensor with a single small bolt and a 2 wire electrical connection at 90 degrees. The sensor looks similar to the cam speed sensor in appearance, its a tube about 25mm (1 inch) long, 20mm (3/4 ") round (from memory). On the A6 it was on the left side of the transmission sort of 5 o'clock if you were looking in the engine bay from the front, on the A4 (6 speed manual) I recall it was on the right side about 10 o'clock. It's well hidden due to the crossmembers so you have to be a bit of a contortionist to get at it. There is a you tube segment where the guy uses a mirror to see it. These are sealed units so it's about $60-$80 sender unit depending on the part number.
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