In fact, you can expect that these lights will flash off and on if the PCM is not able to read the sensors correctly. Check Engine Light (CEL) or Other Error LightsĪ malfunctioning PCM will activate dashboard error lights.Continuing to run a vehicle with a bad PCM could cause further damage.īecause the PCM controls the emissions of your car, a failed emissions test or the presence of oddly-colored or foul smelling exhaust may be a sign that your PCM is going bad. In other cases, the vehicle may run poorly. Problems with the PCM often result in the vehicle not running at all. The PCM is also designed to control both ignition timing and spark. The PCM is responsible for ensuring that the crankshaft and camshaft is positioned correctly so your engine will turn over. Car May Not Run (will not crank, cranks but will not start).Other environmental factors that could lead to PCM failure include thermal stress due to excessive heat and excessive vibration that causes sensitive parts to fail. Water is the primary element to avoid as exposure to it can render the PCM irreparable. It is important to note however, the electrical issue that caused the PCM to experience voltage overload in the first place must be adequately addressed or the new PCM could fail for the same reason.Īs a highly sophisticated computer module, your PCM can be adversely affected by environmental factors that can cause it to fail. Typically, during diagnostics testing a trouble code will help pinpoint if the PCM is faulty. If a solenoid or actuator circuit in your vehicle shorts out or has another issue that compromises its performance, your first sign may be the failure of your PCM. Knowing these symptoms can help you pinpoint the root cause of the problem so you can get your vehicle back up and running. When your PCM fails, it typically exhibits one or more different behaviors. As the primary computer control for your vehicle, your powertrain control module (PCM) plays a vital role in ensuring that your engine and transmission work in tandem.
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