P0799: Pressure Control Solenoid C Intermittent
What to do
Note whether the problem is worse hot or cold, and whether it is worse in traffic than on a long run. That observation separates a hydraulic fault from an electrical one and is something only the driver can supply.
What this code means
Pressure control solenoid C behaves inconsistently, so the shifts it governs vary between journeys or with temperature. Fluid thins as it heats and leaks more readily past a worn bore, so a fault that appears only once the transmission is thoroughly warm points at hydraulics rather than wiring — the same test that applies to the other two pressure control solenoids, and the last of the transmission block's decimal-numbered slots.
Likely causes
Start here
- Faulty pressure control solenoid · moderate
- Worn valve body · specialist
- Damaged transmission wiring harness · moderate
Less common
- Low or degraded transmission fluid · easy
- Corroded transmission connector · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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