P0606 on Toyota Corolla E140: ECM/PCM Processor Fault

Short answer: P0606 means “ECM/PCM Processor Fault”. The car’s computer has found a fault in the ECM system and turns on the Check engine light (MIL). First check: check all battery and ECM power and earth connections first.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code

P0606

System

ECM

Dashboard light

Check engine light (MIL)

Applies to

Generic OBD-II meaning. Not every code is used by this car.

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Source

obd-codes.com

Symptoms and when it is set

1. Check engine light on
2. Photo of a PCM with the cover removed

Likely causes

1. In all likelyhood the PCM / ECM has failed

What to check, in order

1. Check all battery and ECM power and earth connections first
2. Read every stored code; an ECM fault is rare, wiring faults are common
3. Have a specialist confirm before replacing the ECM

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

• P0606 · Toyota Passo (1st gen)
• P0606 · Toyota Corolla (11th gen, E170)
• P0606 · Honda City (5th gen, GM2)
• P0606 · Honda Civic (10th gen, FC)
• P0606 · Suzuki Wagon R (Pakistan, K10B)
• P0606 on all cars compared

← P0604 P0657 →

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.