Technical Definition:

Fuel Level (Sensor A) Circuit Malfunction

Technical Description:

Possible Causes:

Possible Symptoms:

Fuel Level Sensor Circuit Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Fuel Level Sensor
– Fuel Level Sensor harness is open or shorted
– Fuel Level Sensor circuit poor electrical connection
– Faulty combination meter

Specific Makes:

– Fuel level gauge improper operation

Technical Definition:

Evaporative Emission System Purge Control Valve Circuit Low

Technical Description:

Possible Causes:

Possible Symptoms:

Evaporative Emission Purge Solenoid Control Circuit Low Voltage

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission (EVAP) Purge Solenoid Control
– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection

Specific Makes:

Technical Definition:

Evaporative Emission System Purge Control Valve Circuit High

Technical Description:

Possible Causes:

Possible Symptoms:

Evaporative Emission Purge Solenoid Control Circuit High Voltage

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission (EVAP) Purge Solenoid Control
– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection

Specific Makes:

Technical Definition:

Evaporative Emission System Leak Detected (fuel cap loose/off)

Technical Description:

Possible Causes:

Possible Symptoms:

EVAP Control System Leak Detected Fuel Filler Cap Loose/Off

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Damaged, missing or loosely installed fuel filler cap

Specific Makes:

– Possible a noticeable fuel odor caused by the release of fuel vapors
– Fuel cap indicator lamp (FCIL) may be illuminated.

Technical Definition:

Evaporative Emission System Pressure Sensor/Switch Intermittent

Technical Description:

Possible Causes:

Possible Symptoms:

Evaporative Emission Control System Pressure Sensor Intermittent

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission System (EVAP) Pressure sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection

Specific Makes:

Technical Definition:

Evaporative Emission System Leak Detected (gross leak/no flow)

Technical Description:

Possible Causes:

• A loose or improperly affixed gas cap
• A non-conforming gas cap (i.e. not factory/original brand)
• Other leak or damaged piece in EVAP system

Possible Symptoms:

Evaporative Emission Control System Leak Detected Gross Leak

Possible Solutions:

• Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
• Otherwise, replace the gas cap, and/or
• Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Missing or loose fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– EVAP canister or fuel tank leaks
– EVAP system hose leaking
– Fuel tank leaking

Specific Makes:

– Possible a noticeable fuel odor caused by the release of fuel vapors

Technical Definition:

Evaporative Emission System Leak Detected (very small leak)

Technical Description:

The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned.

Possible Causes:

• A small leak in any of the EVAP hoses or fuel tank hoses
• A small leak in the purge valve or vent valve
• The EVAP Canister may be leaking

Possible Symptoms:

EVAP Control System Leak Detected Very Small Leak

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Missing or loose fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– Evaporative Emission (EVAP) canister or fuel tank leaks
– Evaporative Emission (EVAP) system hose leaking
– Fuel tank leaking

Specific Makes:

– Possible a noticeable fuel odor caused by the release of fuel vapors

Technical Definition:

Evaporative Emission System Pressure Sensor/Switch

Technical Description:

Possible Causes:

Possible Symptoms:

Evaporative Emission Control System Pressure Sensor Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission System (EVAP) Pressure Sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

Technical Definition:

Evaporative Emission System Pressure Sensor/Switch Range/Performance

Technical Description:

Possible Causes:

Possible Symptoms:

Evaporative Emission Control System Pressure Sensor Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission System (EVAP) Pressure Sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

Technical Definition:

Evaporative Emission System Pressure Sensor/Switch Low

Technical Description:

Possible Causes:

• Failed fuel tank pressure sensor
• Harness to the sensor has an open or short circuit
• Faulty electrical connection to the FTP sensor
• Cracked or broken vapor line to the vacuum canister
• Cracked or broken positive vapor line to the tank
• Plugged line
• Leaky gasket at the fuel pump module
• Gas cap left loose resulting in a loss of vacuum
• Pinched vapor line

Possible Symptoms:

Evaporative Emission Control System Pressure Sensor Low Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission System (EVAP) Pressure sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection

Specific Makes:

Technical Definition:

Evaporative Emission System Pressure Sensor/Switch High

Technical Description:

Possible Causes:

• Open on FTP sensor signal wire
• Short to voltage on FTP sensor signal wire
• Bad FTP sensor
• Abnormally high pressure in fuel tank due to blockage in EVAP purge hoses or overfilled tank
• Loose/damaged FTP sensor connector
• Loss of ground to the sensor

Possible Symptoms:

Evaporative Emission Control System Pressure Sensor High Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporative Emission System (EVAP) Pressure sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection

Specific Makes: