P25AD — Piston-cooling oil control circuit — stuck active

P25AD concerns piston-cooling oil control circuit. The monitored circuit or control function is reported as remaining active when that state is not expected. The monitored function is oil delivery control for piston cooling. The code does not directly report low oil level or a universal engine oil-pressure value.

Affected system: Piston-cooling oil control

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Implausible sensor or switch signal, poor ground, connector corrosion, or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Repair the verified cause and confirm the code does not return

Also written as: P25AD-00, P25AD00 (some scan tools add the fault-type byte, e.g. -00).