AutoCodes – Cadillac – P1189 Cadillac

P1189 Cadillac Code - Engine Oil Pressure Switch Fault

Quick Answer

The low oil pressure sensor is normally closed. Common causes include Faulty Engine Oil Pressure Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1189 Cadillac indicates Engine Oil Pressure Switch Fault.
Common causes: Common causes include Faulty Engine Oil Pressure Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 14,403

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1189 Cadillac Description

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 10Â°C, then a shorted (low oil pressure) condition of the circuit should be observed prior to engine running.

OBDII Code P1189 Cadillac - Engine Oil Pressure Switch Fault - AutoCodes.com — P1189 Cadillac Code - Engine Oil Pressure Switch Fault

What does this mean?

What are the Possible Causes of the DTC P1189 Cadillac?

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

How to Fix the DTC P1189 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1189 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.