P0440 trouble code 98 chevy blazer - 1998 Chevrolet Blazer

Your car is run by a computer, it the P0440 code comes up, that is what needs fixing. If you see the ETS Light, it is telling you that Traction Control is turned off. Fix the EEC and then clear the code. Then look for the ETS issue.

P0440 OBD-II Trouble Code: Evaporative Emission Control ...

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P0440 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Malfunction". This can happen for multiple reasons and a mechanic needs to ...

P0440 Code: Evaporative Emission Control System ...

CarParts.com https://www.carparts.com > blog > p0440-code-evapor...
Oct 26, 2021 - Diagnostic trouble code (DTC) P0440 stands for "Evaporative Emission Control System Malfunction - Large Leak." Your car's computer (the ECM/PCM) ...

What is the ets off light for in a 1997 Chevy Cavalier?

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Feb 3, 2013 · 5 answers
Susan Syme, you are probably talking about the Enhanced Traction System (ETS) warning light. It will turn on when the engine computer sees a ...

look at these
P0440 OBD II Trouble Code

P0420 Check Engine Light Diagnostic Trouble Code Description

TYPE: OBD & your codes

OBD PO440

OBD PO302

etc & do some studying (learning)

Hi, P0440 indicates your computer is not getting a drop in fuel tank pressure when opening the evaporation system purge valve. This is not a safety issue, as the gas cap will release any excessive pressure, so you can still drive the car. The problem may be a leak in the evap system or a failed purge valve. Please let me know if you would like some troubleshooting steps or if you have other questions, and thanks for using FixYa.

The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The VCM monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated.

The following conditions can cause this problem:
* A disconnected or malfunctioning fuel tank pressure sensor
* A missing, malfunctioning, improperly installed, or loose fuel cap
* A disconnected, damaged, pinched, or blocked EVAP purge line
* A disconnected or damaged EVAP vent hose
* A disconnected, damaged, pinched, or blocked fuel tank vapor line
* A disconnected or malfunctioning EVAP purge solenoid
* A disconnected or malfunctioning EVAP vent solenoid
* An open ignition feed circuit to the EVAP vent or purge solenoid
* A damaged EVAP canister
* A leaking fuel sender assembly O-ring
* A leaking fuel tank or fuel filler neck

Any of the above conditions can set a DTC P0440.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

P0440 - Evaporative Emission (EVAP) System .The most common cause for this code is a loose or bad gas cap.The running issue is unlikely caused by this.Is that the only code present?

A code P0440 could mean one or more of the following has happened:

• The gas cap is not installed or working properly
• The purge solenoid has failed
• The canister is plugged and not working properly

With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
• Inspect the EVAP system for cuts/holes in tubes/hoses
• Inspect for damaged or disconnected hoses around the Evap purge solenoid
• Check and/or replace the sensor
• Check and/or replace the purge valve
• Have a professional use a smoke machine to detect leaks

Get a new gas cap first to try.
thanks

po300 is random missfire code not sure about the other

if you are throwing 79 codes it is probably a computer issue.need to clear and see what comes back up. 440 is not a leak but a malfunction check purge solenoid

More then likely its the Canister Purge Solenoid. you can find it online at www.autozone.com the part number is PV140. And to replace it on blazer you have to remove the spare tire. Alot of people don't know where this part is so I hope this helps you and good luck.