P1775: Transmission System MIL Fault

What does P1775 mean?

P1775 is a diagnostic trouble code indicating "Transmission System MIL Fault". This code relates to your vehicle's transmission and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Harsh or delayed gear shifts
• Transmission slipping
• Vehicle stuck in one gear (limp mode)

Common causes

• Low or degraded transmission fluid
• Worn clutch packs or bands
• Faulty shift solenoid
• Wiring issue to the transmission control module
• Failing torque converter

What should you do?

This code sits in the instrument cluster or driver display. The car itself may be fine, but you can lose the speedometer, the fuel reading or the warning lights, which means the next fault the car develops may not be able to tell you about itself. Get it looked at rather than driving on a blank dash.