P2066 on Mitsubishi: How to Diagnose & Fix
Fuel Level Sensor "B" Circuit Range/Performance
1 Mitsubishi model · 1 documented issue
On Mitsubishi vehicles, P2066 (fuel level sensor "b" circuit range/performance) is most often reported on the 2013 Mitsubishi Outlander Sport as Sub Fuel Sending Unit Harness Omitted at the Factory on 2013 AWD Models ($0-$650 repair). For any 2013 AWD Outlander Sport, check the VIN against NHTSA recall 13V112000 (Mitsubishi campaign SR-13-005) first. If the vehicle is in the population, the dealer installs the proper fuel sending unit harness free of charge, which restores the sub sender's signal and cures both the false gauge reading and the stored code; buy nothing before that check is made. Each section below gives the symptoms, how to confirm the cause, the fix, parts and sources for that model.
Common causes of P2066 (all vehicles)
- Worn or sticking fuel level sender float/rheostat
- High-resistance wiring or ground
- Debris/contamination affecting the float
- Faulty fuel level sensor 'B'
- PCM/ECM fault (rare)
P2066 on Mitsubishi by model: symptoms, diagnosis and fix
AWD Outlander Sport models use a two-lobe fuel tank shaped around the rear driveline, with a main sending unit and a separate sub sending unit measuring the second lobe. Mitsubishi's ECM does not simply watch the sub sender's voltage - it runs a consumption rationality test. Mitsubishi's published service data for this generation sets DTC P2066 when fuel consumption calculated from injector operation reaches 10 litres (2.6 gallons) while the level derived from the sub fuel level sensor has changed by less than 2 litres (0.5 gallon), or when the sub sender's resistance is 13 ohms or below or 70 ohms or above (earlier calibrations used a 30-litre consumption threshold). NHTSA recall 13V112000 documents the manufacturing defect behind this on 2013 AWD cars: certain Outlander Sport AWD vehicles manufactured June 11 through December 11, 2012 were built without the fuel sending unit harness for the sub sending unit, producing a false fuel tank level reading. With the sub sender never reporting a changing level, the gauge shows far more fuel than the tank holds, and the ECM's rationality monitor flags the implausible sub-sender data. The real-world consequence is the serious one for this code family: the driver may believe fuel remains when the tank is empty, and the engine stalls while driving. Outside the recall population the same monitor is set by an aged or contaminated sub level sensor, a corroded sub-sender connector, or a failed fuel pump module assembly.
Common Symptoms
- Check engine light with P2066 stored
- Fuel gauge reads far higher than actual fuel in tank
- Engine stalls from running out of fuel while the gauge shows fuel remaining
- Fuel gauge does not move as fuel is used
- Low fuel warning light behaves erratically
- Range-to-empty display is inaccurate
How to Fix
For any 2013 AWD Outlander Sport, check the VIN against NHTSA recall 13V112000 (Mitsubishi campaign SR-13-005) first. If the vehicle is in the population, the dealer installs the proper fuel sending unit harness free of charge, which restores the sub sender's signal and cures both the false gauge reading and the stored code; buy nothing before that check is made. If the car is outside the recall, follow Mitsubishi's published diagnostic sequence for P2066: read stored codes with the scan tool, then verify the combination meter's fuel gauge operation - Mitsubishi's flow has you condemn the ECM only after the gauge and the sub sensor check out. With the gauge exonerated, test the sub fuel level sensor through its float travel and confirm its resistance stays inside the specified band rather than sitting at or below 13 ohms or at or above 70 ohms, and inspect the sub-sender connector and the harness run along the tank for corrosion, water intrusion, spread terminals and chafe, since a poor connection produces exactly the same non-tracking signal as a dead sender. Mitsubishi lists a failed fuel pump module or sub level sensor as the most likely cause. When the sub sender or the pump module assembly is replaced, seal the tank flange with a new gasket, then clear the code and drive several gallons' worth of fuel before assuming the repair holds - the monitor cannot re-run until enough fuel has been consumed to satisfy its threshold.
What you need to diagnose it
The repair instructions explicitly call for reading stored codes. Use a scanner that can read the named code families before choosing a repair.The recommended scanner supports these code families; confirm your exact year, model and module coverage before buying.
ANCEL AD310 Classic OBD-II Scanner
Read & clear engine (P) codes
$20–$40View
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Reading and clearing the code is DIY work. Module replacement or reprogramming is not — most modules are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
Looking for P2066 on a different make?
View P2066 across all makes →Frequently asked questions
What does P2066 mean on a Mitsubishi?
P2066 stands for "Fuel Level Sensor "B" Circuit Range/Performance." Set when the Fuel Level Sensor 'B' signal is present but implausible or does not track expected fuel usage compared with the primary sender, indicating a performance problem rather than a hard open/short. On Mitsubishi it is documented across 1 model: Outlander Sport.
How do I diagnose P2066 on a Mitsubishi Outlander Sport?
For any 2013 AWD Outlander Sport, check the VIN against NHTSA recall 13V112000 (Mitsubishi campaign SR-13-005) first. If the vehicle is in the population, the dealer installs the proper fuel sending unit harness free of charge, which restores the sub sender's signal and cures both the false gauge reading and the stored code; buy nothing before that check is made. If the car is outside the recall, follow Mitsubishi's published diagnostic sequence for P2066: read stored codes with the scan tool, then verify the combination meter's fuel gauge operation - Mitsubishi's flow has you condemn the ECM only after the gauge and the sub sensor check out. Published repair guidance and available estimates are in the Outlander Sport section on this page.
What causes P2066 on Mitsubishi vehicles?
Documented causes on Mitsubishi: Sub Fuel Sending Unit Harness Omitted at the Factory on 2013 AWD Models. Generic causes of P2066: Worn or sticking fuel level sender float/rheostat, High-resistance wiring or ground, Debris/contamination affecting the float, Faulty fuel level sensor 'B'.
How much does it cost to fix P2066 on a Mitsubishi?
Repair costs vary widely with the root cause and Mitsubishi model; each issue on this page carries its own estimate where one is published.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.