Drivers usually notice the fault through the vehicle’s transmission‑related behavior. The most common observations are:
Because the solenoid remains energized, line pressure in the transmission can stay elevated, producing the above drivability cues.
When the coil inside the solenoid develops an internal short, voltage remains applied even after the control module commands it off. The result is a continuously “on” condition that forces the transmission to stay at higher pressure.
Exposure to moisture, road salt, or vibration can corrode the harness pins that feed the solenoid. Increased resistance or intermittent contact may prevent the module from pulling the coil low, leaving the valve stuck.
The solenoid’s mechanical valve can seize due to debris, worn seals, or internal wear. Even with proper electrical command, the valve cannot close, so pressure stays high.
The transmission control module (TCM) or powertrain control module (PCM) sends the on/off command. Corrupted calibration data or a software glitch can cause the module to continuously command “on,” mimicking a hardware fault.
– Connect a factory‑level scan tool, read the DTC, and confirm that P2733 is present without pending secondary codes that could mask the issue.
– Visually examine the harness leading to the solenoid for signs of corrosion, cracked insulation, or loose pins. Clean any deposits with electrical contact cleaner and reseat connectors.
– With the ignition on and the engine off, measure the voltage at the solenoid’s power feed. It should be 12 V when the module commands “on” and near 0 V when “off.”
– Disconnect the solenoid and measure coil resistance with an ohmmeter. Typical values range from 5 Ω to 15 Ω; an open circuit (∞ Ω) or a value far outside this range indicates a coil fault.
– Use the scan tool’s “Actuator Test” function to command the solenoid on and off while monitoring voltage and pressure sensor feedback. Failure to change pressure confirms a mechanical jam.
– Verify that the TCM/PCM can communicate with the solenoid driver circuit. Check for lost‑communication codes (e.g., U0100 series). A communication failure may point to a module‑level fault rather than the solenoid itself.
– If the coil is shorted, the valve is seized, or wiring is irreparable, replacement of the solenoid is required.
– If the module’s output signal never changes despite a good solenoid, the TCM/PCM may need re‑programming or replacement.
– When software corruption is suspected, update the module to the latest manufacturer calibration using a dealer‑level tool. Verify that the P2733 code does not reappear after a road test.
– After repair, clear all codes, perform a 10‑minute drive covering various loads, and then re‑scan. Absence of P2733 confirms successful resolution.
Typical cost ranges
Repeated electrical shorts, internal valve seizure, or persistent software‑module mismatches often render repair a temporary fix. Once the solenoid’s coil or valve is compromised, the component is prone to fail again under normal operating temperatures. In such cases, installing a new, factory‑spec unit eliminates the risk of recurring faults and restores the transmission’s pressure regulation to original specifications.
Flagship One specializes in VIN‑matched control modules, providing a plug‑and‑drive solution backed by warranty. Modern control modules are complex and integrated with security and immobilizer systems. That’s why choosing a replacement isn’t only about the hardware—it’s about correct programming and compatibility. Replacement units vary depending on production date and software version, so the correct module is matched by VIN before programming.
Service Recommendation: Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.