Error code
OBD2 P0604
OBD2P0604
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Internal Control Module Random Access Memory (RAM) Error.
Severity
highDriving may be possible but could lead to further damage and reduced performance.
Summary
P0604 indicates an error in the Engine Control Module's Random Access Memory (RAM). This code is related to the ECM, which manages engine functions.
Common Causes
- Faulty or corrupted RAM within the ECM
- Electrical issues affecting the ECM
Fixes
- Replacing the Engine Control Module (ECM)
FAQ
What does P0604 mean?
P0604 indicates an issue with the RAM in your vehicle's ECM, which can affect engine performance and operation.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0600Serial Communication Link
- P0601Internal Control Module Memory Check Sum Error
- P0602Control Module Programming Error
- P0603Internal Control Module Keep Alive Memory (KAM) Error
- P0605Internal Control Module Read Only Memory (ROM) Error
- P0606ECM/PCM Processor
- P0607Control Module Performance
- P0608Control Module VSS Output 'A'
- P0609Control Module VSS Output 'B'
- P0610Control Module Vehicle Options Error
- P0611Fuel Injector Control Module Performance
- P0612Fuel Injector Control Module Relay Control