What does P1731 mean on a Ford?

P1731. 1-2 Shift Malfunction. Applies to F-150, Explorer, Ranger with electronic automatics.

What causes P1731 on a Ford?

Worn 1-2 shift components Failing 1-2 shift solenoid Low line pressure Valve body wear in the 1-2 circuit Low fluid level

How do I fix P1731 on a Ford?

Check fluid level and condition Monitor the 1-2 shift with speed data Test the 1-2 solenoid Check line pressure Service the valve body or solenoid per findings

Code

P1731

1-2 Shift Malfunction

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Explorer, Ranger with electronic automatics
Related: P0780 Shift Malfunction on OBD Codes List

Findings, check these first

Worn 1-2 shift components
Failing 1-2 shift solenoid
Low line pressure
Valve body wear in the 1-2 circuit
Low fluid level

Standard procedure

Check fluid level and condition
Monitor the 1-2 shift with speed data
Test the 1-2 solenoid
Check line pressure
Service the valve body or solenoid per findings

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: qualified. Read the source limits below.

OBDII.pro: P1731 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1731: 1-2 Shift Malfunction
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-06.

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