P064E
Internal Control Module O2 Sensor Processor Performance Bank 2
ECM / control module
Generic OBD-II
Medium
What it means
P064E means the ECM's internal processor for handling the bank-2 oxygen-sensor signal isn't performing as expected. This is an internal-module fault, not a failed O2 sensor itself. The engine usually still runs, but fuel control and emissions on bank 2 can be affected. Weak battery voltage and poor ECM power/grounds are worth ruling out before condemning the module.
Medium
Can I keep driving? Usually drivable — the engine runs, but the ECM's internal handling of the bank-2 O2 sensor is impaired, so fuel control and emissions may be off; get it diagnosed.
Common symptoms
What you'll notice
- Check-engine light on
- Fuel-trim or emissions-related driveability issues
- Reduced performance or economy
- Related O2/fuel-trim codes on bank 2
Common causes
Most likely first
- Poor ECM power or ground connectionsLikely
- Low battery voltage upsetting the moduleCommon
- Corrosion or moisture in the ECM connectorsCommon
- Internal ECM O2-processor fault (the module itself)Less often
- Outdated or corrupted ECM softwareLess often
How to diagnose & fix
Work through it in order
- Test the battery and charging system, then check the ECM power and ground connections.
- Inspect the ECM connectors for corrosion or moisture and clean as needed.
- Scan for companion bank-2 O2 or fuel-trim codes that may point elsewhere.
- Clear the code and see if it returns after a few drive cycles.
- If it persists with good power and grounds, reprogram or replace the ECM.
FAQ
Quick answers
Is it safe to drive with P064E?+
Short-term, usually yes — the engine runs, but its internal O2-sensor processing for bank 2 is faulty, so fuel control and emissions may be off. Have it diagnosed rather than ignoring it.
Can I just clear P064E?+
It typically returns because the ECM keeps self-checking. Address the module's power/grounds or the module itself; clearing alone won't fix it.
Related codes
Often seen with P064E
Read & clear P064E yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX