2001 Pontiac Bonneville Fuel Level Sensor - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-16-2014, 06:46 PM   #11
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Last I knew, the fuel sending unit goes to the PCM first. Just like the oil pressure. It uses fuel level data to run EVAP tests during the OBD2 drive cycle.

I'm suspecting a bad connection at the instrument cluster or a bad cluster.
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Old 03-16-2014, 07:40 PM   #12
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its not sent separately to the cluster though, its sent with the speedo, tach, temp, over one or two serial data wires, and those other things are working fine
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Old 03-16-2014, 07:51 PM   #13
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Yea your right Justin, all the data the instrument cluster is getting from the PCM is via the Class 2 Data bus. Which means, the connection is ok, but the cluster is not "processing" the information correctly.
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