P064B code meaning
PTO Control Module
What P064B means
A power take-off (PTO) drives equipment on trucks and pick-ups – tipper, crane, hydraulic pump or winch – from the engine or transmission. A PTO control module, or the PTO function in the engine module, manages switching, working speed and release conditions; P064B reports a fault of this module or an implausible PTO request. The only manufacturer document found is a Chrysler case for Ram chassis cabs: with the PTO engaged the engine speed hunts and does not rise above about 1100 rpm, P064B sets together with the torque monitoring code P061B and the PTO switches off; the cause was software, so check upfitter installation and programming before replacing parts. CARB defines PTO units and allows monitors to pause while one is active. Thresholds and lamp status are not published; driving is usually normal.
P064B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P064B
- PTO switches off or cannot be engaged
- Engine speed hunts with PTO active or stays below about 1100 rpm (Chrysler)
- Warning lamp or stored code; driving usually normal
Common causes of P064B
- Most likelyEngine or PTO module software or calibration (implausible torque or speed request)
- PossiblePTO equipment installed or programmed incorrectly by the upfitter
- PossibleHarness, connector or supply of the PTO module or switches
- Less likelyPTO control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pto control modulePto switchesEngine control module
What each part of P064B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 4B | The exact fault in that area. |
What to do next
- Note P064B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P064B
What does P064B mean?
P064B means "PTO Control Module". A power take-off (PTO) drives equipment on trucks and pick-ups – tipper, crane, hydraulic pump or winch – from the engine or transmission. It is a generic code, so it means the same on every make.
Is it safe to drive with P064B?
Drive gently and only to a workshop. With P064B the car can go into limp mode (reduced power) to protect itself.
Will P064B fail an emissions test?
P064B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P064B to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P064B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.