AutoCodes – Generic – P0781

P0781 Code - 1-2 Shift Malfunction

Quick Answer

This P0781 code indicates that the 1-2 shift valve in the valve body is locked in the direction of the spring compression. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve. 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: P0781 indicates 1-2 Shift Malfunction.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve.
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 14,976

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0781 Description

This P0781 code indicates that the 1-2 shift valve in the valve body is locked in the direction of the spring compression. The Transmission Control Module (TCM) controls the gearshifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to the valves in the valve body. The TCM calculates the "actual" transmission gear by comparing the signals from the input speed sensor and the output speed sensor.

OBDII Code P0781 - 1-2 Shift Malfunction - AutoCodes.com — P0781 Code - 1-2 Shift Malfunction

What does this mean?

What are the Possible Causes of the DTC P0781?

Low transmission fluid level
Dirty transmission fluid
Faulty shifting solenoid valve
Shifting solenoid valve harness is open or shorted
Shifting solenoid valve circuit poor electrical connection

How to Fix the DTC P0781?

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 P0781 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 P0781 code?

Need more information on how to fix the P0781 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P0781 Audi — 1-2 Shift Malfunction
P0781 Chrysler — 1-2 Shift Malfunction
P0781 Dodge — 1-2 Shift Malfunction
P0781 Ford — 1-2 Shift Error
P0781 Jeep — 1-2 Shift Malfunction
P0781 Lexus — 1-2 Shift Valve
P0781 Mazda — 1-2 Shift Valve Malfunction
P0781 Mercedes-Benz — 1-2 Shift Malfunction
P0781 Suzuki — 1-2 Shift Malfunction
P0781 Toyota — 1-2 Shift Valve
P0781 Volkswagen — 1-2 Shift Malfunction

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.