In order to control the amount of pressurized hydraulic fluid (i.e. transmission fluid) that is available to actuate a gear change, the ECU relies on little electromechanical devices known as pressure control solenoids. When pressure is needed, the solenoid moves and allows transmission fluid to flow down a particular channel inside the valve body. If the computer detects an intermittent problem with the pressure control solenoid labeled F, a P2735 DTC will be stored.
How Serious is the Code?
The P2735 OBDII diagnostic trouble code is rather serious, because the problem that caused it can affect the drivability and safety of your vehicle. The transmission could slip when you need to accelerate, and the engine could stall when you’re coming to a stop. These are just some of the transmission problems you could experience. Not to mention the excessive wear and tear to internal components of the transmission.
Symptoms of a P2736 include:
- Harsh, delayed or erratic shifts
- Slipping in-and-out of gear
- Engine stalling
- Transmission gets stuck in gear
- Vehicle won’t move when in gear
- Reduced fuel economy
- Transmission overheats
- Limp mode
- Dirty transmission fluid/filter
- Low transmission fluid
- Damaged/frayed wiring
- Broken/corroded connectors
- Failed pressure control solenoid
- Failed transmission pump
- Internal pressure blockage
- Valve body issue
- TCM or ECU failure
How to Diagnose the Code?
Transmission fluid has a huge bearing on how pressure control solenoids work. If there isn’t enough transmission fluid, they won’t be able to compensate for the lack of pressurized fluid and the P2735 DTC will set. Dirty or thin transmission fluid can’t be pressurized properly, which will cause the P2735 diagnostic trouble code. So a mechanic should first consider how much transmission fluid is in the vehicle, and what kind of shape it is in. If there are no issues here, the wiring and connectors on the transmission wiring harness should be checked. If no problems are found there, then the pressure control solenoid itself will need to be tested. Along with possibly the valve body, transmission pump and ECU.
What Repairs Will Fix P2735?
- Change the transmission fluid and filter
- Replace the pressure control solenoid
- Repair or replace a faulty transmission pump
- Repair or replace transmission valve body
- Repair or replace wiring/connectors
- Reflash or replace TCM/ECU
- P2731 – Pressure Control Solenoid F
- P2732 – Pressure Control Solenoid F Perf or Stuck Off
- P2733 – Pressure Control Solenoid F Stuck On
- P2734 – Pressure Control Solenoid F Electrical
- P2736 – Pressure Control Solenoid F Ctrl Circ/Open