P1065 Possible Causes
- Faulty Engine Control Module (ECM)
- Open or short circuit in Engine Control Module (ECM) harness power circuit
- Open or short circuit in Engine Control Module (ECM) harness ground circuit
How to Fix Code P1065?
Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
The Engine Control Module (ECM) backup Random Access Memory (RAM) system is not functioning properly.
Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P1065 Meaning
Battery voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is off for ECM memory functions including DTC memory, air-fuel ratio feedback compensation value memory, idle air volume learning value memory, etc.