Error code
OBD2 P0601
OBD2P0601
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Internal Control Module Memory Check Sum Error.
Severity
severeCan drive, but may experience significant drivability issues and should be addressed promptly.
Summary
P0601 indicates an internal memory checksum error in the Engine Control Module (ECM), suggesting issues within the ECM's communication or data integrity.
Symptoms
- No symptoms other than a stored trouble code and illuminated warning light
- Harsh, erratic shifting
- Reduced fuel economy
- Surging or hesitation upon acceleration
- Poor acceleration and loss of power
- Frequent engine stalling
- Hard starting
- Rough or erratic idling
Common Causes
- Damaged, burnt, shorted, or corroded wiring and connectors
- Open circuits
- Poor controller ground connections
- Defective drivers in one or more controllers
- Defective electronic components in controllers
- Damage to controllers caused by voltage spikes or low battery voltages
- Short circuits due to water ingress during flooding events
- A defective PCM
Diagnosis
- Record all fault codes and freeze frame data.
- Inspect ground connections for loose or damaged wires.
- Thoroughly inspect wiring harnesses for damage.
- Replace any faulty wiring with OEM parts.
- Consider replacing the entire electrical harness if necessary.
Fixes
- Repair or replace damaged wiring and connectors
- Inspect and secure ground connections
FAQ
Can I drive with P0601?
You can drive, but you may experience drivability issues such as poor acceleration or erratic shifting. It's best to address the issue promptly.
What causes P0601?
Common causes include damaged wiring and connectors, poor ground connections, defective electronic components in controllers, and voltage spikes damaging the PCM.
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
- P0602Control Module Programming Error
- P0603Internal Control Module Keep Alive Memory (KAM) Error
- P0604Internal Control Module Random Access Memory (RAM) 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