This code indicates that the powertrain control module has detected an abnormally high voltage in the transmission fluid temperature sensor circuit. A high voltage input typically signifies an open circuit, meaning the system cannot accurately read the actual temperature of the transmission fluid. As a result, the transmission may default to a safe mode or experience poor shift quality.
A broken wire, corroded terminal, or disconnected connector creates high resistance or an open circuit, triggering the high voltage condition.
The internal resistor inside the sensor may fail and go open, causing the voltage signal to remain high instead of fluctuating with temperature.
Extremely low fluid can sometimes cause sensor reading anomalies or exacerbate electrical connection issues within the transmission.
A rare failure where the control module incorrectly interprets the voltage signal or fails to ground the circuit properly.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
It is not recommended for long distances. The vehicle may enter limp mode or shift harshly, which can cause further transmission damage over time.
No. A 'circuit high' code usually indicates an electrical open circuit, meaning the computer cannot read the temperature at all, rather than the fluid being too hot.
No, replacing the PCM or TCM is a common misdiagnosis for this code. The actual cause is almost always a failed sensor, corroded connector, or broken wire.
It is typically located inside the transmission pan on the valve body or solenoid block, though some external sensors are mounted on the transmission case.