2001 Pontiac Grand Am 2.2L Ecotec.

Question : My Pontiac has the check engine light on. I had the a scan of the codes from Autozone and the mechanic said it was P0171 lean exhaust system. The traction control light is also on the dash. He said the code could have also set the traction lights. Car seems to run and idle good.

Starts up just fine all the time. What is a common cause for this problem? Can it be something i can fix my car myself. My boyfriend has tools and can do some work and maintenance. Thanks for any help.



Answer: Actually, a P0171 code is a Fuel Trim Lean code. The engine is getting more air than fuel which causes a lean condition and will set the code. A vacuum line that has come loose can cause this, or not having an air filter installed, or possibly the duct work to the throttle body has come detached. Those are some quick fixes and can be checked easily. Other things that are a bit more involved to check would be a fuel injector that is clogged, fuel filter that is clogged, or even a fuel pump that isn't putting out as much fuel as it should. Those would need checked by someone experienced and preferably someone that has a scanner that can watch the data stream and fuel trim levels. Another possibility is a faulty oxygen sensor. I would check for vacuum leaks first, as that's usually the cause.


More Auto Repair Help

Be Social With Us !

Pinterest

Leave your comments

Post comment as a guest

0
    • No comments yet.

    Latest Articles

    Car and Truck OBD Code List ...

    Engine computer trouble codes list and descriptions. DTC P0013 Exhaust Camshaft Position (CMP) ...

    Car and Truck ABS Trouble ...

    View a list of ABS brake computer trouble codes and their descriptions. C1214 Brake Control Relay ...

    Airbag (SIR) System Computer ...

    The Supplemental Inflatable Restraint (SIR) system supplements the protection offered by the driver ...

    Dodge Caravan Surging And Dies

    I have a 99 dodge 6 cyl caravan...just got a tune-up and it started surging and would die but ...

    Log In Or Register
    ? The Benefits

    How Things Work

    Traction Control Light- What Does It Mean

    When wheel slip is noted while the brake is not applied, the ABS Computer-(EBCM) will enter traction control mode.

    First, the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount torque delivered to the drive wheels via the delivered torque signal circuit.

    Read more...

    Common Engine Codes

    EGR Codes P0400 - P0405

    P0400-P0405
    The powertrain control module (PCM) tests the exhaust gas recirculation (EGR) system during deceleration by momentarily commanding the EGR valve to open while monitoring the manifold absolute pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in MAP.

    Read more...