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Thread: Alcohol Content Sensor not reading

  1. 03-19-2019 #1
    maxwell406
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    Alcohol Content Sensor not reading

    Hello all, recently i installed a ethanol content sensor and it doesn't seem to be reading in my scanner. i have an Flex enabled tune and the sensor seems to be wired correctly. i poured about 5-10 gallons of e85 in the tank and the scanner still displays 0.0% i've ran the vehicle for over an hour so the definitely is e85 at the sensor at this point. do i have the scanner set up incorrectly or is there something else in doing wrong?further fueling tuning 3 - 4L80E Segment swapped TWO.hptNo content.hpl
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  2. 03-19-2019 #2
    5FDP
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    See if there is more than one ethanol or alcohol channel, could be the wrong one.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.
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  3. 03-21-2019 #3
    maxwell406
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    Seems to be the only one.
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  4. 03-21-2019 #4
    Lakegoat
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    At one point, mine quit reporting on the scanner. I think I had to repoll to get it back. I think I removed it from channels, repolled, and then added it back to channels and it worked again. Hope that was it. It was a while back.
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8
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  5. 03-21-2019 #5
    maxwell406
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    Quote Originally Posted by 5FDP View Post
    See if there is more than one ethanol or alcohol channel, could be the wrong one.

    Now it?s reading but I just added a a full tank of e85 and it won?t change from 37.6%, any ideas? I?m also getting a flexible fuel sensor circuit low code but all the wiring is showing continuity. When I measure pin 56 on the ecu (not coming from the sensor) it will show anywhere from 1 to 5 volts, should it be showing voltage at all? Kind of stumped here. Bad ecu maybe?? Bad sensor?
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  6. 03-21-2019 #6
    maxwell406
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    Quote Originally Posted by Lakegoat View Post
    At one point, mine quit reporting on the scanner. I think I had to repoll to get it back. I think I removed it from channels, repolled, and then added it back to channels and it worked again. Hope that was it. It was a while back.
    I?ll give it a try, thanks!
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  7. 03-21-2019 #7
    maxwell406
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    No luck, still getting 37.6%
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  8. 03-21-2019 #8
    waf5027
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    37.6 is the default for a failed sensor. I?ve been having problems with my gm sensors. I?ve been through 2 of them in less than 6months.
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  9. 03-21-2019 #9
    maxwell406
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    So it?s probably a bad sensor? That seems like the most likely problem I suppose
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  10. 04-02-2019 #10
    maxwell406
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    Got a new computer and a new sensor, still get a p0178 code. One thing I did notice was that I had the sensor wired wrong due to a misleading diagram. Could I have fried the sensors?
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