P0606: ECM/PCM Processor Fault
Short answer: P0606 means “ECM/PCM Processor Fault”. It is a standard OBD-II code, so the basic meaning is the same on every car. Below is what it means on each of the 6 cars we cover, with a link to the full page for each car.
Standard OBD-II code Same meaning on all cars (SAE J2012).
P0606 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | ECM / PCM Processor | low |
| Toyota Corolla (11th gen, E170) | ECM/PCM Processor Fault | medium |
| Toyota Corolla (10th gen, E140) | ECM/PCM Processor Fault | medium |
| Honda City (5th gen, GM2) | ECM/PCM Processor Fault | medium |
| Honda Civic (10th gen, FC) | ECM/PCM Processor Fault | medium |
| Suzuki Wagon R (Pakistan, K10B) | ECM/PCM Processor Fault | medium |
Symptoms
- Check engine light on
- Photo of a PCM with the cover removed
Likely causes
- In all likelyhood the PCM / ECM has failed
What to check, in order
- Check all battery and ECM power and earth connections first
- Read every stored code; an ECM fault is rare, wiring faults are common
- Have a specialist confirm before replacing the ECM
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.