P2796 — Problem with auxiliary transmission fluid pump circuit

The code indicates an issue with the electrical control of the transmission's auxiliary fluid pump. This pump helps maintain proper fluid pressure for smooth shifting and transmission cooling. The fault usually appears due to wiring problems, a faulty pump, or control module issues.

Common causes

The cause is almost always one of a few things. Here they are — P2796 rarely comes from anything outside this list:

• Damaged or corroded wiring/connectors to the pump
• Faulty auxiliary transmission fluid pump
• Transmission control module malfunction
• Blown fuse or relay for the pump circuit

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and repair wiring and connectors first
2. Inspect and replace blown fuses or relays
3. Test and replace the auxiliary transmission fluid pump if faulty
4. Diagnose and repair or replace transmission control module if needed

That is what holds for P2796 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.