Usually, one or more of these symptoms will occur, but it’s not uncommon to have no symptoms other than the check engine light. When your PCM fails, your transmission is likely to stop shifting, shift too soft or harsh or cause complete transmission failure. Since P0102 has to do with the Mass Airflow Sensor, which is a huge part of the Impala’s engine combustion process metering, it is going to cause noticeable symptoms. It is responsible for timing shifts, shift feel, and engaging the clutch. Some modules have an internal memory that will recall your driving habits and apply that data to your transmission’s performance.Ī powertrain control module also controls engine and transmission functions.
2004 impala mass air flow sensor problems driver#
A TCM recognizes when the clutch is engaged and disengaged and reads RPMs, then executes an order based on driver feedback. The TCM makes decisions based on the information it receives from the engine, making it the key to shifting gears and changing the speed. Transmission Control Module (TCM) or Powertrain Control Module (PCM)Īll automatic transmissions use a control module to regulate speed, gear changes, and clutch engagement. LEARN MORE ABOUT RENO’S TRUSTED TRANSMISSION SHOP Please note that problems and their causes vary relative to specific makes and models – these are simply the most common. Damaged or disconnected air intake boot (snorkel) Vacuum leak. Dirty, obstructed, or faulty mass air flow sensor. Other causes are more complicated, such as a vacuum leak or a clogged catalytic converter. Some are easy to check and correct yourself, such as a dirty air filter or mass air flow sensor. Below is a list of various modules and sensors that regulate your automatic transmission. There are many potential causes of code P0101. The number of modules that vehicles use depends on their complexity. In many cases, there may be at least ten different modules that directly or indirectly control and provide feedback to your transmission. A wide array of sensors and modules control your transmission, but what exactly do they do and how do they lead to symptoms of transmission failure?