P2825 — Transmission pressure solenoid circuit signal error

The vehicle's transmission control module detected an inconsistent or impossible signal from the pressure control solenoid J circuit. This usually means the solenoid or its wiring is malfunctioning, causing the transmission to not regulate hydraulic pressure correctly.

Common causes

The cause is almost always one of a few things. Here they are — P2825 rarely comes from anything outside this list:

• Faulty pressure control solenoid J
• Damaged or corroded wiring/connectors in solenoid circuit
• Transmission control module software or hardware issue
• Low or contaminated transmission fluid
• Internal transmission valve body problems

Where to start

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

1. Check and clean solenoid electrical connectors
2. Inspect wiring harness for damage or shorts
3. Test or replace pressure control solenoid J
4. Flush and replace transmission fluid if dirty
5. Diagnose and repair valve body or control module

That is what holds for P2825 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.