P0601high severityPowertrain
Internal Control Module Memory Check Sum Error
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
The PCM has detected a memory checksum error during self-test.
Symptoms
- Check Engine Light
- Erratic engine behavior
- Possible no-start
- Multiple system faults
Common causes
- PCM internal failure
- PCM programming corruption
- Voltage spike damage
- Water intrusion into PCM
Diagnostic steps
- Attempt PCM reprogramming/reflash
- Check for water damage to PCM
- Test PCM power and ground circuits
- Check for TSBs regarding PCM update
Repair notes
Reprogram PCM first. If error persists, replace PCM.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1