P2764 indicates a low voltage or signal condition in the torque converter clutch (TCC) pressure control solenoid control circuit. The powertrain control module (PCM) detects that the solenoid is not receiving adequate command voltage, which can prevent proper clutch engagement.
The solenoid may have an internal short or open circuit, preventing it from receiving the proper control voltage.
Corroded, loose, or damaged wires or connectors can cause a low‑voltage condition.
The PCM’s driver transistor that supplies voltage to the solenoid may be weak or open, resulting in insufficient voltage.
If the valve that the solenoid actuates is clogged or mechanically stuck, the circuit may read low pressure and trigger the code.
A weak battery or poor alternator output can cause marginal voltage in all control circuits, including the TCC solenoid.
It is possible but uncommon. Most P2764 occurrences are due to the solenoid, its wiring, or related mechanical issues. Replacing the PCM should be a last resort after confirming the other components are functional.
Yes. Insufficient system voltage can cause the PCM to read a low signal in the solenoid circuit, so checking the battery and alternator is an early diagnostic step.
The vehicle will typically operate, but the torque converter clutch may not engage, leading to reduced fuel economy, increased heat, and possible transmission wear. Prompt diagnosis and repair are recommended.
Not usually. The torque converter clutch pressure valve is only a secondary cause; most failures are resolved by repairing the solenoid, wiring, or PCM output driver.