P2802 means the Powertrain Control Module (PCM) has detected a low voltage condition on the Transmission Range Sensor B circuit. This sensor tells the PCM which gear the transmission is selected in, so a low signal can cause incorrect gear recognition and shifting issues.
The sensor itself can develop an internal short or open circuit, pulling the signal voltage low and triggering the code.
Chafed, pinched, or corroded wires in the sensor circuit can create a low‑resistance path to ground, causing the PCM to read a low voltage.
Poor contact in the sensor plug or the PCM harness connector can increase resistance and produce a low signal reading.
If the fuse supplying voltage to the range sensor circuit is open, the sensor may receive insufficient voltage, appearing as a low signal.
A malfunction inside the PCM’s input circuit for the sensor can falsely register a low voltage; this is considered only after wiring and sensor checks are normal.
Non‑standard wiring, added accessories, or previous repairs that altered the sensor circuit can introduce faults leading to a low signal.
No. The PCM is rarely the cause; most P2802 cases are due to a faulty sensor, wiring issue, or connector problem. Replacing the PCM should only be considered after those components have been verified good.
Driving is possible but not recommended. The transmission may default to a limp‑in mode, causing reduced power, harsh shifting, or inability to select certain gears, which can lead to unsafe driving conditions.
Clearing the code only turns off the Check Engine Light; if the underlying fault remains, the code will return once the PCM detects the low signal again.