P2815 — High voltage in pressure control solenoid G circuit

The engine control module detected an unusually high electrical signal in the pressure control solenoid G circuit. This solenoid helps regulate hydraulic pressure in the transmission or powertrain system. The code appears when the wiring, connector, or solenoid itself has a fault causing excessive voltage or a short.

Common causes

The cause is almost always one of a few things. Here they are — P2815 rarely comes from anything outside this list:

• Damaged or corroded wiring/connectors in solenoid circuit
• Faulty pressure control solenoid G
• Short circuit or open circuit in solenoid wiring
• Faulty transmission control module (rare)

Where to start

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

1. Inspect and repair wiring and connectors for damage or corrosion
2. Test solenoid operation and replace if faulty
3. Clear codes and test drive to confirm repair
4. Replace transmission control module only if wiring and solenoid are good

That is what holds for P2815 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.