PTA 524227.12 – Pressure Switch for Filter Bypass Valve Closed by Mistake

PTA 524227.12 (PTA )

Code: 524227.12



This diagnostic trouble code is generated when the filter bypass valve (for cold-weather starting) is open while the transmission input speed (engine speed) is above 1400 rpm and transmission oil temperature exceeds +30°C (86°F). If diagnostic trouble code PTA 000127.01 is also stored, process that code first.


Warning remains active until the fault is corrected, indicating a non-critical issue with the filter bypass valve.


Inspect Filter Bypass Valve:

  • Verify that the filter bypass valve is functioning correctly.
  • Replace the valve if it is faulty.

Check Pressure Switch:

  • Ensure that the pressure switch is operating correctly.
  • Repair or replace the pressure switch if necessary.

Examine Wiring and Connectors:

  • Inspect all wiring and connectors associated with the filter bypass valve and pressure switch for signs of damage or disconnection.
  • Repair or replace any damaged components to ensure proper electrical connections.

Verify Operating Conditions:

  • Ensure that the vehicle is not operating under conditions that could inadvertently trigger this fault (e.g., excessively high transmission oil temperatures).

Process Related Codes:

  • If diagnostic trouble code PTA 000127.01 is also stored, address that issue first as it may be related.

Consult Technical Support:

  • If the issue persists, consult technical support or the manufacturer for further diagnosis and assistance.


Proper functionality of the filter bypass valve is important for vehicle operation, especially in varying temperature conditions. Regular inspection and maintenance can help prevent these issues.

Control Units: John Deere

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