Power Take-Off (PTO) Commanded On
The control system has detected that the PTO is commanded to be on.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
This code means the truck's engine control module (ECM) is telling the power take-off (PTO) to engage and provide power for accessories like a hydraulic pump or generator, but something isn't working right.
What the computer is actually seeing
The ECM is monitoring signals from the PTO switch and related sensors. When the driver activates the PTO, the ECM expects a specific voltage (typically around 12V) at the PTO control circuit. If the expected signal is missing or invalid, it triggers this code.
What a healthy reading looks like
Expected voltage at the PTO control circuit should be around 12V when activated; PTO switch should also show continuity or expected resistance values when in the correct position.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the PTO switch position and wiring for damage or loose connections before anything else.
- 2Using a multimeter, measure the voltage at the PTO control circuit with the PTO switch activated; it should read close to 12V.
- 3If the voltage is low or absent, trace the wiring back to the ECM for shorts or opens.
- 4If the wiring and PTO switch are good, check for any ECM software updates or faults in the ECM.
Common causes
- Faulty PTO switch
- Damaged wiring or connectors
- Defective ECM software
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to operate machinery that relies on the PTO until the issue is resolved.
Will this code come back after repair?
If the underlying issue is fixed, this code should not return.
Why does it pair with other codes?
PTO issues often have relation to electrical faults that can cause multiple fault codes.
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