AutoCodes – Generic – P0943

P0943 Code - Hydraulic Pressure Unit Cycling Period Too Short

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: P0943 indicates Hydraulic Pressure Unit Cycling Period Too Short.
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 7,528

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 P0943 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 P0943 - Hydraulic Pressure Unit Cycling Period Too Short - AutoCodes.com — P0943 Code - Hydraulic Pressure Unit Cycling Period Too Short

What does this mean?

What are the Possible Causes of the DTC P0943?

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

How to Fix the DTC P0943?

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 P0943 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 P0943 code?

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Information for Specific Makes

P0943 Dodge — Hydraulic Pressure Unit Cycling Period Too Short

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.