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2003 GMC Envoy SLT 4.2L Poor Fuel Economy, MIL Lamp on
Posted to GM Driveability on 4/26/2006 3 Replies

Vehicle came in with MIL light on and 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 ...

Summary posted 5/25/2006

3 Replies Received (View Replies)

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car Vehicle Data

2003 GMC Envoy SLT

Engine4.2 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
EmissionsOBD-II Compliant
SymptomsPoor Fuel Economy, MIL Lamp On

Trouble Codes

P0172Fuel System Too Rich (Bank 1)
P1523TAC Module Return Performance