P2807 indicates the transmission control module has detected an electrical or performance fault with Pressure Control Solenoid 'G'. This solenoid regulates hydraulic pressure to control shift timing and feel in an automatic transmission.
The solenoid may be internally shorted, open, or mechanically stuck, preventing proper pressure regulation. This is the most common cause of P2807.
Damaged, corroded, or shorted wiring between the solenoid and transmission control module can trigger this code. Check for frayed wires or poor connections at the solenoid or TCM.
Dirty or low-quality fluid can cause solenoids to stick or operate improperly. Fluid that is burnt or contains debris may clog the solenoid or valve body passages.
A worn or damaged valve body, stuck valves, or internal transmission wear can cause improper pressure regulation, mimicking a solenoid failure.
While rare, a TCM software glitch or internal fault could incorrectly report a solenoid issue. This is typically a last-resort diagnosis after all other causes are ruled out.
Driving with this code may cause further transmission damage, especially if the vehicle is shifting harshly or slipping. It’s best to diagnose and repair the issue promptly to avoid costly repairs.
No, the TCM is rarely the cause of this code. The solenoid itself, wiring, or transmission fluid issues are far more likely. Replacing the TCM should only be considered after all other potential causes have been thoroughly ruled out.
If the fluid is contaminated or degraded, a fluid and filter change may resolve the issue. However, if the solenoid or wiring is faulty, fluid replacement alone will not fix the problem.
Testing the solenoid’s resistance and checking for proper voltage at the connector can help differentiate between a faulty solenoid and a wiring problem. A multimeter and wiring diagram are essential for this diagnosis.