What I believe happens is that as the parts wear, they don't function up to full specs. Cleaning the mass air flow sensor on your L, L (and some select L with a MAF sensor) is not hard at all.I believe it turned out to be the Mass Airflow Sensor or a component of the intake system. It may be necessary for the engine to cool down before it will restart. When your PCM fails, your transmission is likely to stop shifting, shift too soft or harsh or cause complete transmission failure.Chevrolet Impala ProblemsStalling Due to Mass Air Flow or Crankshaft Position Sensor Failure on Chevrolet ImpalaThe mass air flow or crankshaft position sensor may fail causing the engine to intermittently stall. 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. 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.
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Please note that problems and their causes vary relative to specific makes and models – these are simply the most common. Below is a list of various modules and sensors that regulate your automatic transmission. 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?
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