Engine-Codes - Chevrolet - P1189 CHEVROLET

P1189 CHEVROLET - Engine Oil Pressure Switch Fault

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1189 CHEVROLET Possible Causes

  • Faulty Engine Oil Pressure Switch
  • Engine Oil Pressure Switch harness is open or shorted
  • Engine Oil Pressure Switch circuit poor electrical connection

How is the P1189 CHEVROLET code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1189 CHEVROLET code

Labor: 1.0

The cost to diagnose the P1189 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1189 CHEVROLET Meaning

The low oil pressure sensor is normally closed. When oil pressure increases above 1 to 4.5 psi the switch contacts open. The Powertrain Control Module (PCM) supplies 12 volts to the oil pressure input circuit. With low oil pressure the 12 volts is pulled low to ground. This diagnostic tests for a open condition of the oil pressure switch circuit. If the engine has been off long enough for engine temperature to drop by 10°C, then a shorted (low oil pressure) condition of the circuit should be observed prior to engine running.

More Information

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