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DTC codes / P26xx · Computer and output circuits / P260C

P260CPTO Control Circuit High

P260C indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the power take-off (PTO) control circuit, which is used to engage or disengage auxiliary equipment such as a hydraulic pump or winch. The PCM commands the PTO circuit on or off and monitors the voltage on the control wire; a high voltage reading means the circuit is seeing voltage when it should not, often due to a short to power or an open ground.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • The PTO system fails to engage or disengage when commanded, so auxiliary equipment does not operate.
  • A warning light on the dashboard, typically the check engine light or a dedicated PTO indicator.
  • The engine may idle differently or refuse to enter high-idle mode used for PTO operation.
  • The PTO indicator lamp may flash or stay illuminated when it should be off.
  • Often no symptoms besides the warning light, especially if the PTO system is not in active use.

Common causes, most likely first

  1. A short to voltage on the PTO control circuit wiring, often from chafed insulation against a power wire.
  2. A faulty PTO switch or relay that is stuck closed or internally shorted, feeding voltage back to the PCM.
  3. An open or high-resistance ground connection at the PTO solenoid or relay, causing the PCM to see high voltage on the control side.
  4. A defective PTO solenoid or actuator with an internal short to power.
  5. Corroded or damaged connectors at the PCM, PTO switch, or solenoid, creating intermittent high-voltage signals.
  6. A PCM internal fault that incorrectly reads the PTO control circuit voltage as high.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in other modules before proceeding.
  2. Inspect the PTO control circuit wiring for visible damage, chafing, or loose connections, especially near heat sources and moving parts.
  3. Disconnect the PTO solenoid or relay and measure voltage on the control circuit with the key on and the PTO command off; any voltage above 0.5V indicates a short to power.
  4. Check the ground circuit for the PTO solenoid or relay using a voltage drop test to confirm a clean, low-resistance path to ground.
  5. Test the PTO switch or relay for continuity and proper operation according to the manufacturer's service information.
  6. If the wiring and components check out, substitute a known-good PCM only after confirming all other possibilities, as PCM failure is rare.

PTO Circuit High: Check the Ground First

  • A high voltage reading on a control circuit is frequently caused by a poor ground rather than a short to power, because the PCM sees the circuit floating high when the ground path is compromised.
  • Aftermarket accessories wired into the PTO circuit, such as auxiliary lights or radios, can backfeed voltage and set this code even when the factory PTO system is functioning correctly.
  • The PTO control circuit may be active only when the vehicle is in park or neutral with the parking brake set, so testing must replicate those conditions to catch an intermittent fault.
  • A stuck-closed PTO relay can keep the solenoid energized and feed voltage back to the PCM, setting P260C without any obvious drivability symptom.
  • Do not replace the PCM based solely on this code; verify the control circuit voltage at the PCM connector with a meter to rule out a wiring issue before condemning the module.

Can I keep driving with P260C?

The vehicle can generally be driven, but the PTO system may be inoperative or stuck on, which could damage auxiliary equipment or create a safety hazard if the PTO drives a pump or winch. Avoid using the PTO system until the fault is repaired, and if the PTO engages unexpectedly, stop driving and have the vehicle serviced.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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