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P1523 Diagnostic Trouble Code Discussion for April 2006

ETC System Malfunction - Throttle Valve Stuck

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Trouble Ticket Help Requests for DTC P1523
Help Request Posted
2003 GMC Envoy SLT 4.2L Poor Fuel Economy, MIL Lamp on VIN: 1GKDS13S93
P1523: TAC Module Return Performance. ... codes P1523 Throttle Plate Position, and P0172 System runs rich bank 1. Hooked-up fuel pressure gauge found pressure to be 55psi, spec call for 54psi. Fuel pressure regulator has no vacuum to it. Is this normal. I did try to hook up a vacuum hand pump and ...
April 26, 2006