P0179 Code - Fuel Composition Sensor Circuit High Input

What Does P0179 Mean?

The PCM has detected an abnormal voltage reading from the fuel composition sensor (flex fuel sensor) or circuit. This sensor is designed to detect fuel (ethanol) contamination and provide the PCM with an accurate fuel temperature.

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What are the common causes of P0179 ?

• Flexible Fuel (FF) sensor to Vehicle Power (VPWR) circuit harness open or shorted
• FF to VPWR circuit poor electrical connection
• Open in FF sensor signal circuit
• Short to ground in FF sensor signal circuit
• Fuel contamination

What are the symptoms of P0179 ?

• Engine Light ON (or Service Engine Soon Warning Light)

How do you troubleshoot P0179 ?

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code P0179 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0179.

Fortunately, P0179 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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