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Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 12803
Experience:  ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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2002 Trailblazer LTZ Oil pressure gauge will suddenly indicate

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2002 Trailblazer LTZ: Oil pressure gauge will suddenly indicate zero when coming to a stop (idle). Increasing RPMs only slightly will call indicator to "pop" up to normal pressure indication. Is this a sensor or a pump problem?
Hello, although I never like to give a 100% answer in regards XXXXX XXXXX pressure low/no readings, by your description, it sounds like an oil pressure sender problem. The abrubt drop and abrupt rise is not really an indication of bad oil pressure. Now.. with that being said, whenever there is a problem with pressure, it is always advisable to have a manual guage check to confirm sender is bad. I am leaning towards the sender by your descrition only.

ngine Oil Pressure Sensor and/or Switch Replacement

Removal Procedure

  1. Raise the vehicle. Refer to Vehicle Lifting.
  2. Remove the engine shield.
  3. Remove the electrical connector from the oil pressure switch.
  4. Remove the oil pressure switch.

Installation Procedure

Notice: Refer to Fastener Notice in Service Precautions.

  1. Install the oil pressure switch.
    • Tighten the oil pressure switch to 20 Nm (15 ft. lbs.).
  1. Install the electrical connector to the oil pressure switch.
  2. Install the engine shield.
  3. Lower the vehicle.



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