What does your PCM control?
The powertrain control module, aka PCM, is your vehicle’s brain. It manages the engine, transmission and other systems based on information it receives from various sensors around the vehicle.
What are the symptoms of a bad PCM?
7 Common PCM Failure Symptoms
- Your ‘Check Engine’ Light is On.
- Your Car Won’t Start or Starts Roughly.
- Sudden Loss of Gas Mileage.
- You Failed Your Emissions Test.
- Your Engine Stutters or Stalls.
- Erratic or Random Shifting.
- You’re Receiving a PCM-Related Error Code.
- What to Do If You Experience PCM Failure Symptoms.
What is a PCM on a Chrysler Town & Country?
This Engine Computer also referred to as an Engine Control Module (ECM), Engine Control Unit (ECU) & Powertrain Control Module (PCM) is a guaranteed replacement for all 2012 Chrysler Town & Country PCM models with a 3.6L engine size and matching part number 68185473AC.
What is the difference between a ECM and PCM?
Most people, including automobile technicians, confuse the two for each other. The main difference between the two is that the ECM controls specific parts of the engine, regulating and sending commands. While the PCM is used in newer models to control almost all engine functions.
What is PCM fault?
Overview is defined as PCM Processor Fault. This code means there’s an internal integrity fault in the PCM. This error code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system, particularly vehicles made since 1996 up to present.
What causes a PCM to fail?
PCMs typically fail for one of two reasons: voltage overloads (often due to a short in a solenoid or actuator circuit) or environmental factors (corrosion, thermal stress or vibration). Thermal stress and vibration can form microcracks in circuit boards (which are repairable).
Does the PCM control spark?
The way the system works is, readings are taken from the crankshaft position sensor by the PCM. The PCM then calculates the needed timing and fires the ignition coil at the correct time. The distributor then directs the spark to the correct cylinder.
What is a Powertrain Control Module (PCM)?
Many of your car’s functions are controlled by the powertrain control module (PCM), which works in conjunction with the engine control module (ECM) and transmission control module (TCM) to adjust engine timing, the air to fuel ratio, and other systems. So before we talk about how to test a PCM, here are some common symptoms of a PCM failure.
What to do if you get a PCM code on your car?
You need to check the sensors that are connected to your PCM, as well as the wires that connect them. If you’re seeing a PCM code – or two, or three – it can really help you narrow in on which sensors or wires are faulty. Perform a visual inspection of these wires, as well as checking them with a multimeter.
What should my PCM voltage be with the engine off?
It should read at least 12.6 volts with the engine off, or 13.7 volts with the engine running. If it’s showing less than that, fully charge your battery and re-test. The reason this is important is that low voltage can cause certain sensors to fail, depriving your PCM of the input it needs to make correct adjustments.