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.
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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSCONTINUOUSLY VARIABLE TRANSAXLE (CVT) (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERRORTROUBLE SYMPTOM
2016 Subaru Legacy 2.5i
DTC P0604 Internal Control Module Random Access Memory (Ram) Error: Trouble Symptom
2016 Subaru Legacy 2.5iSECTION Trouble Symptom
TCM RAM malfunction
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK DTC.
|
Is DTC P0604 displayed? | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > | Current condition is normal. Check for interference from noise, etc. |
RENDER: 1.0x
NO RELATED
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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.