Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0606: Control Module Processor: Notes
DTC detecting condition:
Immediately at fault recognition
Trouble symptom:
- Improper idling
- Poor driving performance
Failure detection pattern:
- "Primary" (high-priority diagnosis)
Warning light/indicator light:
- Malfunction indicator light
- CHECK DTC
.
- Turn the ignition switch to ON. (Engine OFF)
- Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Besides DTC P0606, is any of P0102, P0103, P0335, P2119, P2122, P2123, P2127, P2128 or P2138 displayed? (Current code)
Yes : Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
No : Replace the ECM.
Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.