What are the Possible Causes of the DTC P0440 Chevrolet?
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
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
Faulty vent solenoid
Faulty EVAP purge switch
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How to Fix the DTC P0440 Chevrolet?
Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that triggers the P0440 code.
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0440 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
When is the Code Detected?
The Evaporative Emission (EVAP) system is not able to build vacuum
What are Code Possible Symptoms?
Engine Light ON (or Service Engine Soon Warning Light)
A noticeable fuel odor may result from fuel vapor release
Code P0440 Chevrolet Description
The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) system for the following conditions:
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The PCM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The PCM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The PCM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
P0440 Chevrolet Code - Evaporative Emission System
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