Subaru Fault Code

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P0700

Check Engine Light / AT Oil Temp Solid

System

Transmission / Comms

Symptom

Check Engine Light / AT Oil Temp Solid

Diagnosis & fix steps

LOGIC: Transmission Control System (MIL Request). ACTION: Connect diagnostic tool and switch direct communication from the ECM to the TCM (Transmission Control Module). Pull the underlying active transmission fault code directly from TCM memory.

Red Seal field insights

Gateway Flag: P0700 is an informational flag stored in the engine computer indicating the transmission computer has requested MIL illumination due to an internal drivetrain fault.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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