P2066 OBD-II Trouble Code: Fuel Level Sensor “B” Performance

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2066 code

P2066 is a diagnostic trouble code (DTC) for "Fuel Level Sensor “B” Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2066 DIAGNOSTIC Get a fair and transparent estimate upfront

P2066 code definition

Fuel Level Sensor “B” Performance

What the P2066 code means

P2066 is an OBD-II generic code for the engine control module (ECM) detecting the fuel level sensor “B” performance. The sensor output voltage is not accurate when compared to the fuel level sensor “A”.

What causes the P2066 code?

  • The engine control module (ECM) uses fuel level sensors A and B output voltages to determine the vehicle's fuel control. The two fuel senders are used on vehicles that have a dual bladder or a dual sump fuel tank.

  • The sensor does not move indicating the fuel is going down after a certain amount of miles are driven. (e.g., it is after 100km or 62 miles for a Chevrolet)

  • There is a difference between the two sensors of about 7 gallons after about 200 km or 120 miles are driven, or for more than 30 minutes of driving.

What are the symptoms of the P2066 code?

  • The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.

  • The fuel system may not reflect how much fuel is in the fuel tank.

  • The vehicle may run out of fuel if the fuel tank sensor is not accurate.

How does a mechanic diagnose the P2066 code?

  • Scans for codes and documents any codes in the ECM, and then looks at the freeze frame data for failure.

  • Checks the sensor A and B to compare the readings for fuel level and compares it to the actual fuel level.

  • Checks the fuel level sensor B for the proper resistance with a multimeter.

  • Follows the manufacturer pinpoint tests for the diagnosis and replacement of the fuel level sensor B.

Common mistakes when diagnosing the P2066 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

  • Failing to clear the ECM codes after the codes are fixed so the ECM will enable the system to be normal again.

  • Replacing the fuel level sensor without first checking the fuel transfer pump is working to transfer the fuel from one side to another if vehicle is equipped.

How serious is the P2066 code?

  • Code P2066 is a code letting the operator know the fuel level sensor is not working properly and may affect the amount of fuel available to the engine.

What repairs can fix the P2066 code?

  • Replacing the fuel pump sending unit B
  • Repairing the connector pins of corrosion or loose connections at the fuel pump or the fuel tank

Additional comments for consideration regarding the P2066 code

Code P2066 is for a performance problem with the fuel level sensor B. Vehicles that use this second sensor may also have a transfer pump that may be failing and will cause the unequal fuel levels in the two sides of the fuel tank. Keep this in mind when diagnosing the code and look at other codes that may also be present.

Need help with a P2066 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P2066
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2066 code.

SCHEDULE P2066 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,170

Rating Summary
4,765
197
50
27
131
4,765
197
50
27
131

Fred

16 years of experience
364 reviews
Fred
16 years of experience
Mercedes-Benz E500 - Check Engine Light is on - Conroe, Texas
Fred was very friendly and thorough to get to the root of the issue. Even when he could not find a fault to why my engine light was on, he went above and beyond to make absolutely sure that the concern was minimized. Turns out, all that needed to be done was a reset but his diagnostic to address my issues was very intricate and appreciated.

David

17 years of experience
37 reviews
David
17 years of experience
Chevrolet Cruze - Check Engine Light is on - Aurora, Colorado
David was on time, professionalisms & honest! I would definitely request him again and pass along to friends/family.

John

18 years of experience
18 reviews
John
18 years of experience
Dodge Ram 1500 - Check Engine Light is on - Memphis, Tennessee
Demonstrated good integrity. Advised me when work I thought needed done was unnecessary and was helpful in identifying issues that needed to be addressed

Robert

21 years of experience
17 reviews
Robert
21 years of experience
Chrysler 200 - Check Engine Light is on - Fort Worth, Texas
Robert did a good job working on my car and letting me know what's needed to keep my car driving smoothly.


Related questions

There is no fuel to the fuel rail. There are error codes of p0461 and p2066. The fuel tank is half full.

Hi there. The fuel level sensor in the fuel tank has either failed or has an open in the wiring and the computer has caught this and stored the codes P0461 and P2066. You will need to remove the fuel...

More related articles

P0381 OBD-II Trouble Code: Glow Plug/Heater Indicator Circuit Malfunction
Trouble code P0381, also called the "wait to start lamp control circuit," means there's a problem with the glow plug or heater indicator circuit.
P0057 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
P0057 P0057 trouble code definition P0057 is a code that sets when the powertrain control module senses that the voltage is low on the bank 2 sensor 2 oxygen sensor. What the P0057 code means When a P0057 trouble code...
P2006 OBD-II Trouble Code: Intake Manifold Runner Control Stuck Closed Bank 1
P2006 trouble code definition The P2006 code is a generic OBD2 diagnostic trouble code relating to the intake manifold runner control circuit....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com