AutoCodes – Buick – P1187 Buick

P1187 Buick Code - Engine Oil Temperature Sensor Circuit Low Voltage

Quick Answer

The Powertrain Control Module (PCM) monitors the Engine Oil Temperature Sensor. Common causes include Faulty Engine Oil Temperature Sensor, Engine Oil Temperature Sensor harness is open or shorted, Engine Oil Temperature Sensor 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: P1187 Buick indicates Engine Oil Temperature Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Engine Oil Temperature Sensor, Engine Oil Temperature Sensor harness is open or shorted, Engine Oil Temperature Sensor 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 3,301

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 P1187 Buick Description

The Powertrain Control Module (PCM) monitors the Engine Oil Temperature Sensor. The PCM sets the OBDII code when the Engine Oil Temperature Sensor is not to factory specifications.

OBDII Code P1187 Buick - Engine Oil Temperature Sensor Circuit Low Voltage - AutoCodes.com — P1187 Buick Code - Engine Oil Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1187 Buick?

Faulty Engine Oil Temperature Sensor
Engine Oil Temperature Sensor harness is open or shorted
Engine Oil Temperature Sensor circuit poor electrical connection

How to Fix the DTC P1187 Buick?

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 P1187 Buick 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.

Need more information about the P1187 Buick code?

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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.