P064D

Internal Control Module O2 Sensor Processor Performance Bank 1

Q: Is it safe to drive with P064D?

Generally yes — despite some sources, this code does not stop the engine from starting. It affects O2-based fuel control, so expect worse economy and possible emissions issues until fixed.

Q: Can I just clear P064D?

It may clear after a battery/power fix, but a genuine internal processor fault will return once the ECM re-runs its self-check, requiring reprogramming or replacement.

ECM / O2 processor Generic OBD-II High

What it means

P064D sets when the ECM's internal oxygen-sensor signal processor for bank 1 fails its self-check, so the computer can't reliably process O2 feedback used to trim fuel. The engine still starts and runs, but fuel control and emissions can suffer. It usually points to ECM power/ground problems or an internal module fault.

High

Can I keep driving? Usually drivable — the engine still starts and runs, but fuel trim and emissions may suffer as the ECM loses reliable O2 feedback, so get it checked.

Real-world scan data

Seen in

122

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P064D scans

U0100in 54.1% of scans

P0030in 41.8% of scans

P010Cin 41.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Poor fuel economy
Possible failed emissions test
Fuel control may default to a fixed strategy, causing slightly rough running

Common causes

Most likely first

Internal ECM oxygen-sensor processor faultLikely
Open or shorted ECM power supply circuitCommon
Weak battery or poor ECM power/ground connectionsCommon
ECM programming issue or a faulty ECMLess often

How to diagnose & fix

Work through it in order

Check and clean the battery terminals and confirm ECM power and ground are solid, then clear the code.
Inspect the ECM power supply wiring for opens, shorts, or high resistance.
Check for an ECM software update that addresses the internal processor fault.
If it returns after voltage and wiring are verified, reprogram or replace the ECM. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P064D?+

Generally yes — despite some sources, this code does not stop the engine from starting. It affects O2-based fuel control, so expect worse economy and possible emissions issues until fixed.

Can I just clear P064D?+

It may clear after a battery/power fix, but a genuine internal processor fault will return once the ECM re-runs its self-check, requiring reprogramming or replacement.

Read & clear P064D yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX