P0177 OBD-II Trouble Code: Fuel Composition Sensor Circuit Range/Performance

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Cost of diagnosing the P0177 code

P0177 is a diagnostic trouble code (DTC) for "Fuel Composition Sensor Circuit Range/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
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Toyota$20.00
BMW$20.00
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P0177 code definition

Fuel Composition Sensor Circuit Range/Performance

What the P0177 code means

P0177 is a generic OBD-II code indicating that the diesel fuel sensor has detected water in the fuel filter, or the fuel composition sensor is out of its specification range.

What causes the P0177 code?

  • The engine control module (ECM) receives input from the diesel fuel sensor that water is detected in the fuel, or the fuel composition sensor is not within specification range, and triggers the P0177 code

What are the symptoms of the P0177 code?

  • The Water in Fuel illuminates on the instrument cluster
  • The ECM sets code P0177 to memory and triggers the Check Engine Light

How does a mechanic diagnose the P0177 code?

  • Scans codes and documents the freeze frame data, then clears the codes to verify code returns

  • Drains off water in the fuel filter by opening the water drain valve on the fuel filter housing

  • If the Water in the Fuel Light does not go out, removes the fuel filter and tests the sensor, replacing it if shorted or out of specification range for the vehicle being tested

  • Clears codes and tests the system to see if the Water in Fuel Light goes out, and the P0177 code does not return

Common mistakes when diagnosing the P0177 code

Follow these simple guidelines to prevent misdiagnosis:

  • Drain fuel from the filter until no more water is present. If excess water is still in the fuel sample, then the fuel in the tank may be contaminated with excessive water and would need to be drained and replaced.

How serious is the P0177 code?

  • If excessive water is in the fuel then you will have engine starting and running issues.
  • The engine may misfire, hesitate, and stall.

What repairs can fix the P0177 code?

Additional comments for consideration regarding the P0177 code

Not many manufactures use the code P0177, and the code is set in the computer memory to indicate the engine fuel has or had water in it.

Need help with a P0177 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.

P0177
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Kevin

24 years of experience
388 reviews
Kevin
24 years of experience
Chevrolet Tracker - Check Engine Light is on - Stone Mountain, Georgia
Kevin was pretty cool! He explained things to me in a way I could understand and was able to offer me some good options to fix my car problems! Very professional and knew his stuff! Excellent experience

JOHNNY

33 years of experience
63 reviews
JOHNNY
33 years of experience
Toyota Camry - Check Engine Light is on - Carmichael, California
Johnny was early, friendly, and thorough! He explained things to me about my car that I had no idea about before! I booked him for a diagnostic appointment and I’m definitely requesting him for a follow-up!

Benji

22 years of experience
184 reviews
Benji
22 years of experience
Jaguar XK - Check Engine Light is on - Phoenix, Arizona
Will absolutely recommend Benjie to all my friends, thorough and knowledgeable. Will have him back fit all future car repairs!

Marco

29 years of experience
124 reviews
Marco
29 years of experience
Kia Soul - Check Engine Light is on - Riverside, California
Marco was great. Cam on time, and explained everything he did. Also gave good recommendation for fixing as the problem has a Kia recall.


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