Question about 2004 GMC Sierra

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Truck broke down wont start.

Ran over a truck tire on the highway.No damage underneath.
Fuses good. Relays good. Fuel pump has great pressure but no power to pump. No engine code. Is there a fuel accident cut off switch?

Its a 2004 GMC Box truck. Ex penske rental.I think its on a Savana van frame. V8

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  • Anonymous Mar 28, 2014

    how to remove the pressure hose from the power steering pump and the frame of the truck?

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  • Master
  • 1,596 Answers

There is no Inercia Switch to reset Like Ford
Have you Double Checked All Underbody wiring for fuel pump ,OPEN In Pink/blk tracer fuel power lead,also
Oil Sending unit on most GM Vehicles have the ability to turn OFF GROUND to Fuel Pump Relay as a Proyection Against LOW OIL Pressure in engine.


Fuel Cutoff Mode
The PCM cuts OFF fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability:

  • The ignition is OFF. This prevents engine run-on.
  • The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
  • The engine speed is too high, above red line.
  • The vehicle speed is too high, above rated tire speed.
  • During an extended, high speed, closed throttle coast down-This reduces emissions and increases engine braking.
  • During extended deceleration, in order to prevent damage to the catalytic converters

Posted on Jan 26, 2009

  • Ronnie Wilson Jan 26, 2009

    OOPs PROTECTION Against Low oil Pressure

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