Code P2755 indicates that the powertrain control module has detected a higher than expected voltage in the transmission fluid cooler control circuit. This typically points to an electrical fault in the system that manages transmission fluid temperature, such as a short to power or a failed control component.
The internal switch or relay that controls the transmission fluid cooler can short internally, causing a continuous high voltage condition on the control circuit.
Chafed, melted, or damaged wiring in the control circuit can short to a power source, sending excessive voltage to the control module and triggering the code.
Corroded, pushed back, or loose terminals in the circuit connectors can alter resistance and cause abnormal voltage readings.
On vehicles equipped with an electrically driven auxiliary cooler pump, an internal short in the pump motor can cause this high voltage code.
A failure in the internal driver of the powertrain or transmission control module is possible but rare, occurring only if it cannot properly regulate the circuit voltage.
It means the control module is detecting voltage on the control circuit when it expects the circuit to be off or at a lower voltage, usually indicating a short to power or a failed component.
It is risky. The transmission fluid cooler may not operate, leading to transmission overheating, which can cause severe internal transmission damage.
No, this is an electrical circuit code related to the cooler control system, not a mechanical failure inside the transmission itself.
Rarely. Although some mechanics or sources may prematurely suggest the computer is bad, the cause is almost always a failed solenoid, relay, or a wiring issue. The control module should be the absolute last component tested and replaced.