P0177 - OBD Trouble Code

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The P0177 fault code can be defined as fuel composition sensor circuit range/performance. The P0177 is a generic code which would indicate that the diesel fuel sensor has detected water in the fuel filter, or the fuel composition sensor is out of its specification range.

Want to know something more about P0177 fault code? The ecm would receive input from the diesel fuel sensor that water is detected in the fuel or the fuel composition sensor is not within the specification range, and would start triggering the P0177 fault code. The most common symptom of this code would be that the water in the fuel would start illuminating on the instrument cluster and engine control module would set this fault code and would trigger the check engine light.

What causes this problem with the Fuel Composition Sensor Circuit Range/Performance?

• Flexible Fuel sensor to vehicle power circuit harness open or shorted
• There can be a poor electrical connection in FF to VPWR circuit
• Issue of open in FF sensor signal circuit Short to ground in FF sensor signal circuit
• The fuel might start contaminating

1. Flex Fuel Sensor - OBD Code P0177 can flash if the Flex Fuel Sensor is damaged. You must replace it with a brand new one online with us.
2. Circuit - Do you remember when was the last time you got your car air Circuit inspected? A defected Circuit can cause a lot of issues like displaying P0177 code.
3. Fuel Delivery System - Did your mechanic just found out that there is some fault in the Fuel Delivery System? Buy top notch Fuel Delivery System from us at economical prices.
4. Fuel Injector Pulse - A lot of issues can arise do to defective Fuel Injector Pulse. Did you just see P0177 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.

It is very important to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0177 here:

Common Symptoms

• Overall decrease in the engine performance
• Problem of car engine not starting
• Rise in the fuel consumption

Here are some ways with which you can correct this issue:

• The water present in the fuel filter should be drained off and then the check engine light codes should be cleared up
• The shorted water sensor should be replaced
• Make sure that you repair the shorted or burned wiring or connectors to the water sensor
• The fuel filter housing should be replaced with sensor, and the codes should be cleared

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• The first thing which you should do is to scan the codes and documents the freeze frame data, then clears the codes to verify code returns
• The water should be drained off in the fuel filter by opening the water drain valve on the fuel filter housing
• If you find out that 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

Here are some simple guidelines with which you can prevent misdiagnosis:

• The fuel should be drained off from the filter until no more water is present. If there is excess water still present in the fuel sample, then the fuel present in the tank might get contaminated with excessive water and then it should be drained and replaced.

P0176 - Fuel Composition Sensor Circuit Malfunction

P0178 - Fuel Composition Sensor Circuit Low Input

P0179 - Fuel Composition Sensor Circuit High Input