AutoCodes – Generic – P0942

P0942 Code - Hydraulic Pressure Unit

Quick Answer

Line pressure is electronically controlled by the Transmission Control System (TCM) and is measured by the Line Pressure Sensor (LPS). Common causes include Low transmission fluid level, Shift Lever Position, Plugged Transmission filter. 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: P0942 indicates Hydraulic Pressure Unit.
Common causes: Common causes include Low transmission fluid level, Shift Lever Position, Plugged Transmission filter.
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 41,710

How popular is this code, among other codes? Medium

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 P0942 Description

Line pressure is electronically controlled by the Transmission Control System (TCM) and is measured by the Line Pressure Sensor (LPS). The desired line pressure is continuously being compared to the actual line pressure and is regulated by electronically changing the duty cycle of the Pressure Control Solenoid (PCS). The Transmission Control System calculates the desired line pressure based on inputs from the transmission and engine. A calculated torque input to the transmission is used as the primary input to the desired line pressure calculation and is called Torque Based Line Pressure. The Transmission Control Module (TCM) monitors the Hydraulic Pressure Sensor. The TCM sets the OBDII code when the Hydraulic Pressure Sensor is not to factory specifications.

OBDII Code P0942 - Hydraulic Pressure Unit - AutoCodes.com — P0942 Code - Hydraulic Pressure Unit

What does this mean?

What are the Possible Causes of the DTC P0942?

Low transmission fluid level
Shift Lever Position
Plugged Transmission filter
Faulty Transmission Oil Pump

How to Fix the DTC P0942?

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 P0942 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 P0942 code?

Need more information on how to fix the P0942 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0942 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0942 Dodge — Hydraulic Pressure Unit
P0942 Ford — Hydraulic Pressure Unit
P0942 Lincoln — Hydraulic Pressure Unit
P0942 Mercury — Hydraulic Pressure Unit

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.

Frequently Asked Questions about P0942 Code

No Frequently Asked Questions about P0942 Code found.

Discuss the causes and fixes for P0942 OBDII Code

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Ken Mansberry
Date: February 8, 2019 at 4:54 am

How hard is it to change the pressure unit and can I drive it with it reading on the computer

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OBDIITech
Date: February 9, 2019 at 6:23 pm

What model and year is your vehicle? do you have any other symptoms?

Reply to Comment
Ken Mansberry
Date: February 10, 2019 at 8:38 pm

It's a 2007 freestyle it's not my car I'm looking at buying it if it's not hard fix

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OBDIITech
Date: February 11, 2019 at 5:25 pm

Fixing the P0942 code could be a very expensive repair. From a national database of repairs, the only solutions found for the P0942 code was the Transmission Assembly.

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