P1780 (blink 66) on Toyota Passo (KGC10): Switch solenoid open/short

Short answer: P1780 means “Switch solenoid open/short”. The car’s computer has found a fault in the AT (4-speed, K3-VE E4A/T per spec table A1-3) system and turns on the Automatic gearbox warning light. First check: follow manual section procedure for this code.

Code

P1780 · blink 66

System

AT (4-speed, K3-VE E4A/T per spec table A1-3)

Dashboard light

Automatic gearbox warning light

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

M300/M301 export; JDM Boon/Passo 1st gen by platform

Confidence

high (factory chart); description parsing medium

Source

carmanualsclub.com

Symptoms and when it is set

1. Warning lamp per chart (see page)

Likely causes

1. Switch solenoid open/short

What to check, in order

1. Follow manual section procedure for this code

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P1780 · Toyota Vitz (1st gen)
• P1780 · Toyota Corolla (9th gen, E120)
• P1780 on all cars compared

← P1731/22 U0100/82 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.