P0440 Pontiac Code - Evaporative Emission System
Quick Answer
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. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0440 Pontiac indicates Evaporative Emission System.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0440 Pontiac Description
- 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.
What are the Possible Causes of the DTC P0440 Pontiac?
- 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
How to Fix the DTC P0440 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0440 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Pontiac Models
- P0440 2000 Pontiac Grand Am — Evaporative Emission System
Frequently Asked Questions about P0440 Pontiac Code
1. What is the meaning of OBDII code P0440 on a Pontiac?
- OBDII code P0440 indicates a problem with the Evaporative Emission Control System.
2. What are common symptoms of a P0440 code in a Pontiac?
- Common symptoms include the check engine light coming on, a strong fuel odor, or issues with passing emissions tests.
3. What causes the P0440 code to appear on a Pontiac?
- The code can be triggered by a loose or damaged gas cap, a leak in the evaporative emission system, or a faulty purge valve.
4. How can I diagnose the cause of a P0440 code on my Pontiac?
- Diagnosing the issue usually involves checking the gas cap for tightness, inspecting hoses and connections for leaks, and testing the purge valve for proper operation.
5. Can a loose gas cap trigger the P0440 code on a Pontiac?
- Yes, a loose or improperly sealed gas cap is a common cause of the P0440 code in Pontiac vehicles.
6. How serious is a P0440 code on a Pontiac?
- While the code itself may not cause immediate drivability issues, it can lead to increased emissions and potential long-term damage if left unresolved.
7. How can I repair a P0440 code on my Pontiac?
- Repair options may include tightening or replacing the gas cap, repairing or replacing damaged hoses, or replacing the purge valve as needed.
8. Can I reset the P0440 code on my Pontiac by disconnecting the battery?
- Disconnecting the battery may clear the code temporarily, but it is important to address the underlying issue to prevent the code from reappearing.
9. Is it safe to continue driving my Pontiac with a P0440 code?
- It is generally safe to drive with a P0440 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent further problems.
10. How much does it typically cost to repair a P0440 code on a Pontiac?
- The cost of repair can vary depending on the specific cause of the code, but it may range from $100 to $500, including parts and labor.
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