Question about 2004 GMC Sonoma

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Evap system code after some time GMC sonoma 2000 2.2

The check engine light goes on after a while and goes off by itself. The code is from evaporative emission control system.

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  • GMC Expert
  • 239 Answers

I would start fuel cap. Check the o Ring. If in question replace it and reset your check engine light. Then I would inspect the evap system from the fill, to the tank, and up to the engine. Could be the selenoid or the carbon filters if they are on this vehicle.

Posted on May 04, 2013

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Posted on Jan 02, 2017

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SOURCE: fix engie light code p0442 Evaporative Emission

OBD II Code P0442

Evaporative System Malfunction, Small Leak Our emissions expert has put together the following information about the P0442 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
Related Information Check Engine Light
Emission Gas Definitions

OBD II Fault Code
  • OBD II P0442
Fault Code Definition
  • Evaporative System Malfunction, Small Leak
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0442 Code
  • Defective or damaged fuel cap
  • Distorted or damaged Fuel Tank Filler Neck
  • Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister
  • Defective Fuel Tank Sending Unit gasket or seal
  • Small split in a seam of the Carbon Canister
  • Defective Evaporative Vent Valve and/or Evaporative Purge Valve
  • Defective or damaged Fuel Tank
  • Defective Fuel Tank Pressure Sensor
  • Defective Leak Detection Pump
  • Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Basics
The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process.
Want to Learn More?
The EVAP system is designed not only to capture, store, and purge any raw fuel vapors that leak from areas in the Fuel Storage system, but also to run a series of self-tests that confirm or deny the operational and vapor holding ability of the system. This is an important task because at least 20 percent of vehicle-produced air pollution originates from malfunctioning Vehicle Fuel Storage systems.
There are many ways to "leak test" the EVAP system, but most perform the leak test when the vehicle is sitting (like over night) or during the initial start-up after the vehicle has been sitting over night. The EVAP system's operational performance is also tracked by the Power Train Computer by reading the change in the oxygen sensor voltages and short term fuel trim whenever the stored vapors are released or "purged" back into the combustion process. These values should indicate that fuel is being added to the system and that the overall mixture is getting richer. The purging process occurs when the vehicle is under acceleration, which is when most vehicles require additional fuel.

P0442 Diagnostic Theory for Shops and Technicians
The P0442 code indicates that there is a small leak in the EVAP system, but this is somewhat misleading. What the code really indicates is that the EVAP system will not hold a specified level of vacuum for a specified amount of time when it performs its leak test.
Here is how the evaporative leak test is performed by the Power Train Computer:
  1. When the leak test is performed, the vehicle must have been sitting for at least four to eight hours so that the engine temperature and outside air temperature are identical. There must also be between 15 and 85 percent fuel in the tank-this is to provide a baseline for the test since gasoline and diesel are volatile fluids that expand and vaporize easily with warm temperatures.
  2. When the leak test initiates, the Vapor Canister Vent Valve is closed to prevent any fresh air from entering the EVAP system. The Purge Valve is also sealed off.
  3. The Leak Detection Pump operates to build a vacuum in the entire Evaporative System (see the Leak Detection Pump information below). After a specified time interval-usually about ten seconds-the Purge Valve is shut off and the vacuum level in the system is measured by the Fuel Tank Pressure Sensor.
  4. Finally, a countdown initiates, which measures the rate at which the vacuum decays in the system. If the vacuum decays faster than the specified rate on two successive tests, then the Power Train Computer will fail the EVAP system and trigger the P0442 code. Most modern EVAP systems will fail the leak test with a pin-sized hole anywhere in the EVAP system, which amounts to 0.020 of an inch or a ½ millimeter.

Posted on Nov 27, 2010

jigsawbill
  • 398 Answers

SOURCE: 2001 GMC Yukon SLT

Sorry this one is beyeond my field of experience.

Posted on Sep 01, 2008

SOURCE: check engine light

it should be mounted on the charcoal canister near the fuel tank

Posted on Sep 13, 2008

emissionwiz
  • 76691 Answers

SOURCE: 1998 GMC Sonoma threw code P1133 02S 1/1

P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.

Posted on Apr 20, 2009

  • 115 Answers

SOURCE: obd2 reader code po442 evaporative emission

check gas cap and make sure on good, if possible find another one to try on car to see if that works clear codes before trying(take neg cable off battery for approx ten minute) or might have leak in vaccume line or canister

Posted on Sep 03, 2009

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2 Answers

I have a 2006 GMC 1/2 ton pickup with 5.3 V8. Engine light came on and upon checking, it has a P0442 and P0442 P code. Any suggestions on this? Also how do I erase the engine light.


You erase the engine light by fixing the problem . With every DTC - diagnostic trouble code there are diagnostic flow chart's , steps to find the problem .

DTC P0442 : Evaporative Emission (EVAP) System Small Leak Detected

How to Diagnose P0442 Small Evap Leak 04 Chevy Avalanche

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1 Answer

Po446 code on 2002 gmc sonoma where is the evap puge solenoid


need more info if high mileage on original fuel pump check pressure because if pump is not pumping enough fuel it will not open fuel pressure regulator and will give you same issue

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1 Answer

2002 GMC SONOMA CODE P 0442


Code 442 is a common code for a small leak in the EVAP system. The computer vents the gas tank to the vapor canister when the engine is running. The computer checks for leaks also.
The EVAP system would need to be checked for leaks.

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How to fix a engine code p0453 on a 2000 Kia sephia


P0453 KIA - EVAP Emission System Pressure Sensor High Input

There is no one magic bullet fix.
Here are the poss issues that trigger the code and light.Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure sensor
- Damaged fuel tank pressure sensor (same part as above)

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My 98 sonoma truck runs but lacks power with service engine soon light on .trouble code reads po300 cylinder misfire detected (random) what dose this mean


See also: P0300 diagnostic code @ OBD-Codes.com
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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2 Answers

Code says evaporator purge solenoid


Which code specifically? Do not assume you need a new solenoid. Our recommendation will depend on the specific code and some troubleshooting results. I usually recommend checking over all the EVAP vacuum lines and the gas cap too whenever there is a purge valve code. Check the vacuum lines at the cannister in the left rear bumper. I will paste info on the purge solenoid below.

P0440 Evaporative emission (EVAP) system - malfunction

Possible causes: Hose connection(s), intake leak, EVAP canister purge valve


P0441 Evaporative emission (EVAP) system - incorrect flow detected

Possible causes: Hose connection(s), intake leak, EVAP canister purge valve


P0442 Evaporative emission (EVAP) system - small leak detected

Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve


P0443 Evaporative emission (EVAP) canister purge valve - circuit malfunction

Possible causes: Wiring, EVAP canister purge valve, ECM


P0444 Evaporative emission (EVAP) canister purge valve -open circuit

Possible causes: Wiring open circuit, EVAP canister purge valve, ECM


P0445 Evaporative emission (EVAP) canister purge valve -short circuit

Possible causes: Wiring short circuit, EVAP canister purge valve, ECM


P0450 Evaporative emission (EVAP) pressure sensor - circuit malfunction

Possible causes: Wiring, EVAP pressure sensor, ECM


P0455 Evaporative emission (EVAP) system - large leak detected

Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve


P0456 Evaporative emission system - very small leak detected

Possible causes: Mechanical fault, hose connection(s), EVAP pressure "sensor


P0457 Evaporative emission system - leak detected (fuel cap loose/off)

Possible causes: Mechanical fault, hose connection(s), EVAP pressure sensor


P0458 Evaporative emission system, purge control valve -circuit low

Possible causes: Wiring short to earth, EVAP valve


P0459 Evaporative emission system, purge control valve -circuit high
Possible causes: Wiring short to positive, EVAP valve


Evaporative Emission Purge Solenoid

Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.
Removal & Installation
The duty cycle evaporative (EVAP) canister purge solenoid is located in the engine compartment near the brake master cylinder.

  1. Disconnect electrical connector at solenoid.
  2. Disconnect vacuum lines at solenoid.
  3. Lift solenoid slot from mounting bracket for Removal & Installation.

To Install:
  1. Position solenoid slot to mounting bracket.
  2. Connect vacuum lines to solenoid. Be sure vacuum lines are firmly connected and not leaking or damaged. If leaking, a Diagnostic Trouble Code (DTC) may be set with certain emission packages.
  3. Connect electrical connector to solenoid.
Purge solenoid location:

jturcotte_65.gif
EVAP cannister location:
jturcotte_66.gif

Nov 05, 2010 | 2000 Jeep Grand Cherokee

2 Answers

I have a p0442 engine code on my 2002 gmc sonoma?


P0442 - Evaporative Emission (EVAP) System Small Leak Detected.In this instance first thing I would check is the gas cap to make sure its tight and the seal that meets up with the filler neck is not cracked.Rust built up on the filler neck can sometimes cause a poor seal.

Sep 03, 2010 | GMC Sonoma Cars & Trucks

2 Answers

Check Engine lite comes on Code PO440


16824/P0440/001088 - EVAP Emission Control Sys: Malfunction Possible Symptoms
  • Malfunction Indicator Light (MIL) active
Possible Causes
  • Evaporative Emission (EVAP) System leaking
  • Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty
  • Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty
Possible Solutions
  • Check Evaporative Emission (EVAP) System Sealing
  • Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
  • Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)

Jun 17, 2010 | 2000 Volkswagen Beetle

3 Answers

2000 cavalier check engine light code po440


P0440 - Evaporative Emission (EVAP) System


evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


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. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional 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

Jun 06, 2009 | 2003 Chevrolet Cavalier

1 Answer

Jetta 2.0 2000


16826/P0442/001090 - EVAP Emission Control Sys: Small Leak Possible Symptoms
  • Malfunction Indicator Light (MIL) active
Possible Causes
  • Evaporative Emission (EVAP) System leaking
Possible Solutions
  • Check Evaporative Emission (EVAP) System Sealing
    • Check Fuel Cap

May 22, 2009 | 1999 Volkswagen Jetta

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