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P0178 Diagnostic Trouble Code Discussion for February 2009

Fuel Composition Sensor Low Frequency

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Trouble Ticket Help Requests for DTC P0178
Help Request Posted
2002 Chevrolet Tahoe LS 5.3L Poor Fuel Economy, MIL Lamp on VIN: 1GNEK13Z82
P0178: Fuel Composition Sensor Low Frequency. This truck came in with a p0178 scanned and checked info on scanner and ms=0 and frequency=0 when running, wiggled truck and both stay 0. Checked wires at sensor only 3 and has 14.2v on power and ground wires and 7.2 on ref wire, scanner still says 0. Plugged ...
February 16, 2009