Question about 2004 Chevrolet TrailBlazer

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3 codes from autozone...low coolant level, it is not low, but a simple fix. Emissions-small leak, replaced fuel cap, not sure if problem fixed. Cam position sensor, bolt was loose, cleaned sensor and retightened, not sure if problem fixed. Vehicle still idles rough and very poor fuel mileage...any suggestions. I just had a tune-up done.

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  • clayton_r119 May 24, 2011

    I did the tune-up my self. Rechecked everything, nothing loose or missing.

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If you just had a tune up done, return it to the shop that did it. They may have left something off that would be quick and easy for them to find since they were just in there.

Posted on May 24, 2011

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Emissions code is showing code po442. Cannot find any leaks. Already replaced gas cap. What is the other most obvious problem that can be fixed easily?


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

Jun 05, 2011 | 2002 Ford Explorer

1 Answer

Hi, My engine light came on so I took it to AutoZone who told me it was the EGR hose so I had that replaced 2 weeks ago. Yesterday, the light came back on so back to AutoZone I went this morning. It is...


Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
  • 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

Mar 13, 2011 | 2002 Chrysler PT Cruiser

3 Answers

'low coolant light' flashes all the time and then 'service engine soon'


These problems may or may not be related. The Check coolant light means that the coolant level in your radiator is low. If you have checked it and it is not low, then the sensor is most likely defective. The low coolant sensor will not turn the Check Engine light on - even if the coolant really is low. There are many things that can cause the Check Engine light to come on. You will have to scan your Engine Computer to find out why it has been turning the light on.

I did have a problem on one of these cars one time where the Check Engine light was coming on and there were several codes for the Throttle Position Sensor(TPS) and the Manifold Absolute Pressure (MAP) sensor and the car ran really bad. The Check Coolant light was also on. After checking it out I found that the coolant level sensor was shorting out the 5 volt reference circuit (VREF) from the computer and causing the whole problem. Replacing the coolant level sensor fixed the car.

Mar 06, 2011 | 1995 Chevrolet Lumina

3 Answers

Check fuel cap light went on today. how do i fix it?


If you refueled your vehicle with the engine running, this is what caused the light to come on. Otherwise, your fuel cap may not be on correctly. Check your fuel cap and make sure it is installed correctly. Be sure that it "Clicks" when you tighten it. Then drive the car for a couple days and the light should go out on its own. If it does not go off in 2 or 3 days, then you need to have your evaporative emissions (fuel tank) system checked for leaks.

Feb 19, 2011 | 2003 Mercury Grand Marquis

2 Answers

Check eng. light is on, scanner sais small emissions leak, replaced rubber connecting lines already. Help


Small emission leak would indicate to me that the exhaust is leaking, maybe, throwing off the O2 sensor.

If it's an evaporative leak, then I would make sure the gas cap is on tight, and that the filler tube is connected with a vapor tight connection to the tank, and that the tank has no leaks in it.

What was the code, exactly, if I might ask?

Jan 14, 2011 | 1999 Jeep Cherokee

1 Answer

I have no gears forward or reverse. My Vehicle is a 2003 Dodge Ram 1500 4x4 Hemi with 170,000 on the clock. Fluid is clean and full with no leaks. I have the following trouble codes:...


Your scanner will give you the code but it will not tell you how to fix your vehicle. Scanners basically tell you what systems to check or what systems are failing.

These are what your codes mean:

P0700: Transmission Control Module
- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module. This is just a informative code.

P0734: Gear ratio error in 4th gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0732: Gear ratio error in 2nd gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0731: Gear ratio error in 1st gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0871: Transmission Fluid Pressure Sensor Switch C

P0876: Transmission Fluid Pressure Sensor Switch D

Emissions Codes:

P0400: Exhaust Gas Recirculation Flow Malfunction
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR temperature sensor and circuit
- EGR Valve

How to fix :
- Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

P0440: EVAP Emission Control System Malfunction
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0456: EVAP Control System Leak Detected (Very Small Leak)
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0441: EVAP Emission Control System Incorrect Purge
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

Based on the info check your EVAP system. I would check for leaks and maybe replace the EGR and the canister.

For the transmission check the TCM also you may need to take it to a mechanic though.

Hope this helps a little.

- Tech 101 (ASE CERTIFIED MASTER TECHNICIAN)
- Larson's Mobile Auto Repair
- 209-845-7620
- Oakdale, CA

Dec 31, 2010 | Dodge Pickup Cars & Trucks

4 Answers

Hi I have a Dodge Neon 2003 with engine codes P0456 and P0440. What do these mean and how do I fix them


P0456....Evaporative Emission Control System Leak Detected (very small leak)


P0440....Evaporative Emission Control System

Nov 12, 2010 | Dodge Neon Cars & Trucks

1 Answer

Keep getting 02 codes on cavalier


WOW!!! have you run your gas tank low enough to have the tattel light to come on. "Low fuel light" if this happens on a regular basis you will pick up debris from the lower filter and it can code your system. Sure way to tell is if you are hearing your pump when you weren't before. Easy fix by dropping tank and changing filter. Check fuel lines at tank for air leaks, any amount of fuel leakage will also comparmize a pressurized system.

Feb 25, 2010 | 2001 Chevrolet Cavalier

2 Answers

I have failed emissions testing and have scanned my Audi TT to determine the problem codes ate P0116, P0118 and P0456. What are teh codes related to?


P0116 - Engine coolant temperature circuit range/Performance problem

P0118 - Engine coolant temperature circuit/High input

P0456 - EVAP leak monitor/Small leak detected

The following web site list all codes


http://www.2carpros.com/trouble_codes




Nov 30, 2009 | 2000 Audi TT

3 Answers

The check engine light keeps coming on -we were told it was because gas cap was loose-but she filled up & tightened the cap-but still on


First, you need to go to a local parts store and find out what the code means. If it shows a small leak, the gas cap probably needs replaced. Gas caps need replaced more often now that computers register fuel emissions.

Jul 01, 2009 | 2006 Suzuki Grand Vitara

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