P064B
PTO Control Module
ECM output / PTO
Generic OBD-II
High
What it means
P064B means the ECM detected a fault involving the power take-off (PTO) control module — the module that manages an auxiliary power output found on trucks and work vehicles. It usually points to the PTO module or its wiring. Normal road driving is typically unaffected, but PTO-driven equipment may not operate.
High
Can I keep driving? Usually safe to drive — the power take-off feature is affected, not normal road driving; have it diagnosed at your convenience.
Common symptoms
What you'll notice
- Check-engine light on
- Power take-off (PTO) does not engage or works erratically
- Loss of PTO-driven equipment function
Common causes
Most likely first
- Faulty PTO control moduleLikely
- Wiring or connector fault between the ECM and PTO moduleCommon
- Faulty engine control module (ECM), least likelyCommon
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the PTO control module circuit is at fault.
- Inspect the wiring and connectors between the ECM and PTO control module.
- Check power and ground to the PTO control module.
- Test/replace the PTO control module if it fails to respond.
- Only consider the ECM after the module and wiring check out.
FAQ
Quick answers
Is it safe to drive with P064B?+
For normal road driving, generally yes — the fault is in the power take-off system. Any PTO-driven equipment may not work until it's repaired.
Can I just clear P064B?+
It will return until the PTO control module or its wiring is repaired. Clearing it alone won't restore PTO function.
Related codes
Often seen with P064B
Read & clear P064B 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