P2069 indicates that the vehicle's control module has detected an intermittent problem in the fuel level sensor B circuit. The sensor provides the PCM with the fuel tank's current fuel level, and the code signals that the signal is not steady.
The sensor itself can develop intermittent faults due to internal wear or manufacturing defects, causing the circuit to open or short sporadically.
Moisture, oxidation, or improper seating of the sensor's connector can interrupt the signal, leading to intermittent readings.
Chafed, cracked, or pinched wires between the sensor and PCM can create intermittent electrical connections.
Problems within the vehicle's interior wiring that supplies power or ground to the sensor can cause intermittent signal loss.
A rare failure of the PCM's input circuitry can also cause intermittent detection, but this is usually considered only after sensor and wiring checks.
Replacing the PCM is rarely necessary; the issue is usually due to the fuel level sensor, its wiring, or connector rather than the control module itself.
If the underlying fault is resolved and the system completes a drive cycle without the problem, the code will turn off automatically.
Yes, intermittent sensor signals can cause the gauge to read incorrectly, stay fixed at empty or full, or fluctuate.
No, the sensor can be tested with the tank empty or full, but standard safety precautions should be observed when working near fuel systems.