P25AA: Piston Cooling Oil Control Circuit Low
Standardized SAE J2012 code · P25xx — Auxiliary inputs
What does P25AA mean?
The piston-cooling oil-jet control circuit reads stuck low — short to ground or low-side driver stuck on. The jets may be enabled continuously, raising oil pump load and lowering oil pressure to other consumers.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Control wire shorted to ground
- Low Connector pins corroded - high contact resistance
- Low Harness chafing through insulation
Likelihood is a general estimate across vehicles; your make and model may differ.
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P25AA in the community
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