P0604 on Toyota Passo (KGC10): Internal Control Module RAM Error

Short answer: P0604 means “Internal Control Module RAM Error”. The car’s computer has found a fault in the ECM system and turns on the Check engine light (MIL). First check: not given in source; see Toyota/Daihatsu repair manual DTC section.

Code

P0604

System

ECM

Dashboard light

Check engine light (MIL)

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

Unverified for 1st-gen Passo/Boon; 1KR-FE (toyota-club.net list covers all 1KR-FE variants; 1st-gen KGC10/15 fitment not individually confirmed)

Confidence

low - NOT in Daihatsu M300 factory chart (B8-52..55); likely later-gen/Toyota-built 1KR only

Source

toyota-club.net

Symptoms and when it is set

1. Not given in source

Likely causes

1. Not given in source (code list only)

What to check, in order

1. Not given in source; see Toyota/Daihatsu repair manual DTC section

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

• P0604 · Toyota Corolla (11th gen, E170)
• P0604 · Toyota Corolla (10th gen, E140)
• P0604 · Honda City (5th gen, GM2)
• P0604 · Honda Civic (10th gen, FC)
• P0604 · Suzuki Wagon R (Pakistan, K10B)
• P0604 on all cars compared

← P0563 P0606 →

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.