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Oil Pressure Always Indicates High

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1997 GMC Savana Special, 1997 GMC Savana Camper Special, 1997 GMC Savana, 1997 Chevrolet RV Cutaway, and 1997 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. With engine running, compare oil pressure with oil pressure gauge reading. If readings are reasonably accurate, gauge is operating properly. Check engine. If readings are not reasonably accurate. go to next step.
  2. Disconnect oil pressure sender harness connector. Connect a fused jumper wire between ground and Tan wire terminal at oil pressure sender harness connector. Oil pressure gauge should indicate 0 psi. If indicator indicates 0 psi, replace oil pressure sender. If indicator indicates high oil pressure, go to next step.
  3. Disconnect instrument cluster harness connector. Connect a self-powered test light between instrument cluster harness connector terminal B8 (Tan wire) and oil pressure sender Tan wire terminal. If test light lights, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If test light does not light, repair open in Tan wire.
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