P0606 on Ford Vehicles: Control Module Processor Fault
The engine computer failed its own internal self-test – check its power and grounds before replacing it. P0606 →
10Complaints mentioning the code
#1Rank among 7 brands
0.4%Share of Ford DTC complaints
In NHTSA owner complaints we analyzed for Ford, P0606 was mentioned 10 times.
Notes by brand
On many Fords with electronic throttle control, P0606 shows up alongside the wrench light and reduced power, and the root cause is often the electronic throttle body or its wiring rather than the PCM itself. Test the throttle system before replacing the PCM.
Most mentioned models
| Ford Fiesta | 6 | |
|---|---|---|
| Ford Focus | 2 | |
| Ford Focus Bev | 2 |
Model years mentioned
Components named in these complaints
- Power Train (8)
- Electrical System (3)
- Fuel/propulsion System (2)
- Unknown Or Other (2)
- Engine (1)
Often appears together with
Possible causes
- Low or unstable supply voltage from a weak battery or charging fault
- Poor ECM ground or high resistance in its power feed
- Internal ECM hardware failure
- Software fault that needs a reflash or calibration update
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.