P0C26: Electric/Auxiliary Transmission Fluid Pump A Motor Current
What to do
As P0B00.
What this code means
The current drawn by the auxiliary transmission fluid pump's motor is wrong.
Current is the most honest thing a pump reports, because it is a direct measure of how hard the motor is working. Low means it is not doing the work — a winding gone open, a supply not arriving, or a pump spinning freely because it has lost its prime or its drive. High means it is working too hard, and on a pump that almost always means mechanical load: debris, a stiffening bearing, or fluid too cold and thick to move at the speed asked.
So the two directions genuinely separate electrical from mechanical here, which they do not always do. The family's argument, and why this pump exists at all, are at P0B00.
Likely causes
Start here
- Faulty auxiliary transmission fluid pump · specialist
- Corroded or loose connector · easy
Less common
- Open circuit in pump wiring · moderate
- Low or degraded transmission fluid · easy
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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