Fuel Level Sensor B Performance
What it means
P2066 means the second fuel level sensor is not reading plausibly — its signal does not track the fuel in the tank as expected. Many vehicles use two senders in a saddle tank, and this code points to the "B" one. The engine runs fine; the main effect is an inaccurate fuel gauge. Check the sending unit and its wiring before replacing parts.
Can I keep driving? Safe to drive — the engine runs normally, but the fuel gauge may read inaccurately, so track your mileage to avoid running out.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Inaccurate, stuck, or erratic fuel gauge reading
- Check-engine light on
- Fuel-remaining or range display may be wrong
- May block the EVAP readiness monitor from completing
Common causes
Most likely first
- Faulty fuel level sensor B (sending unit / float)Likely
- Sensor harness open or shortedCommon
- Poor or corroded electrical connection at the senderCommon
- Faulty instrument cluster / combination meterLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and watch the fuel level signal change as fuel is used or added.
- Inspect the wiring and connector to the sending unit for opens, shorts, or corrosion.
- Test the sending unit's resistance across empty-to-full travel; replace if it reads erratically or out of range.
- If the sender is good, check the instrument cluster/gauge circuit.
FAQ
Quick answers
Is it safe to drive with P2066?+
Can I just clear P2066?+
Related codes
Read & clear P2066 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.