AutoCodes – Generic – P0940

P0940 Code - Hydraulic Oil Temperature Sensor Circuit High

Quick Answer

The Transmission Control Module (TCM) monitors the Hydraulic Oil Temperature Sensor. Common causes include Faulty Hydraulic Oil Temperature Sensor, Hydraulic Oil Temperature Sensor harness is open or shorted, Hydraulic 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: P0940 indicates Hydraulic Oil Temperature Sensor Circuit High.
Common causes: Common causes include Faulty Hydraulic Oil Temperature Sensor, Hydraulic Oil Temperature Sensor harness is open or shorted, Hydraulic 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 9,842

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0940 Description

The Transmission Control Module (TCM) monitors the Hydraulic Oil Temperature Sensor. The TCM sets the OBDII code when the Hydraulic Oil Temperature Sensor is not to factory specifications.

OBDII Code P0940 - Hydraulic Oil Temperature Sensor Circuit High - AutoCodes.com — P0940 Code - Hydraulic Oil Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0940?

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

How to Fix the DTC P0940?

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 P0940 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 P0940 code?

Need more information on how to fix the P0940 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0940 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0940 Dodge — Hydraulic Oil Temperature Sensor Circuit High

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.