What happens when you replace the PCM in a car?

After replacing the PCM, the engine may crank and even fire initially, but die almost immediately. Certain Ford vehicles incorporate the Passive Anti-Theft System (PATS). This security feature immobilizes the vehicle by disabling the fuel pump, injectors and possibly the starter, until the ignition key relearn is performed on the car.

What does the security feature on Ford PCM do?

This security feature immobilizes the vehicle by disabling the fuel pump, injectors and possibly the starter, until the ignition key relearn is performed on the car. Motorcraft Service provides a reference chart that identifies all Ford PATS vehicles.

What does it mean when your PCM is not working?

The presence of fault codes means something else is wrong that needs to be diagnosed and repaired. So until the real problem is found and fixed, the PCM may not function normally. If the engine control system is not going into closed loop, chances are the coolant sensor or oxygen sensor are not working properly.

What happens if my PCM fails the emissions test?

This may cause you to fail your state’s emissions test. If your car does fail, check your PCM and ECM first. Believe it or not, a failed PCM or PCM may actually be good news: replacing either of these systems is significantly cheaper than getting a new catalytic converter.

How can you tell if a PCM has been flashed?

Or, if you were to get a used PCM from a pick and pull, you can take it to a dealer and they will “FLASH” it so that the odometer and VIN and stuff matches the truck. If a PCM has been flashed, they will attach a decal on it, saying “FACTORY AUTORIZED UPDATE” if it was done by a dealer. Click to expand…

Can a PCM be flashed to a factory tune?

Rather than actually fix the plenums that were bad, they flashed the PCM’s with a tune that had retarded timing, to reduce the knock the bad plenum gasket was causing. Plus, a dealer is only going to flash it to a factory authorized tune, they wont change anything unless it’s to “cover up” another issue.

How to flash and reset Pats after replacing PCM?

It also provides a Flash User Manual that describes the requirements and procedures needed to Flash and reset PATS after the ECM has been replaced. To access this information online, please follow these steps: 1. Go to www.motorcraftservice.com 2. Access your subscriptions 3. Select “Reprogramming and Initialization” 4.

Can you replace the PCM on a 2007 Jeep Liberty?

When you’re searching for a replacement PCM, it’s important to keep in mind that PCMs are programmed for a specific make and model of vehicle. If you drive a 2007 Jeep Liberty with a 3.7-liter V6, you can’t use just any PCM. You can’t use just any Jeep PCM replacement.

What does the PCM do on a jeep?

The Powertrain Control Module (PCM) is the computer that controls most of your Jeep’s essential systems. The PCM controls the engine timing, the fuel to air ratio, the transmission, and the anti-lock brakes, along with dozens of other smaller functions.

Where can I find the replacement part number for my PCM?

If you’re not sure, you can find your PCM’s OEM replacement part number on the PCM itself, or in your manufacturer’s catalog. For the average person, using the OEM standard replacement is recommended, since it’s guaranteed to work properly with your vehicle and won’t void your warranty.

Where can I find the replacement part number on my PCM?

Most supplier’s catalogs list replacement PCMs both ways. So if in doubt, always refer to the OEM number on the PCM and look it up in the suppliers cross reference index to find their replacement part number. The calibration chip and PROM contains the programming instructions for the vehicle application.

Why do I keep getting PCM error codes?

PCM error codes include: In addition to these codes, you may be getting other check engine codes that return after repairs. For example, you may keep getting O2 sensor errors, replacing your O2 sensors, and getting the same errors again days later.

What does the Check Engine light on a PCM mean?

by Richard Ristow A Powertrain Control Module (PCM) is a car’s central diagnostic computer. It monitors a vehicle’s engine and fueling system, and once a problem is detected, the PCM turns on the vehicle’s “Check Engine” light. This light will also activate if the PCM begins to falter or become unresponsive.

Is it possible to repair a bad PCM?

Repairing is possible in some cases. Extreme heat and excessive vibration are other two environmental factors that can cause the malfunction of the PCM. Vibration or heat creates micro-cracks in the circuit boards that are repairable. Depending on the type of bad PCM symptoms, you may have to repair or replace the unit.

What is the Powertrain Control Module ( PCM )?

A Powertrain Control Module (PCM) is a car’s central diagnostic computer. It monitors a vehicle’s engine and fueling system, and once a problem is detected, the PCM turns on the vehicle’s “Check Engine” light. This light will also activate if the PCM begins to falter or become unresponsive.

What happens if you replace the solenoid on a PCM?

If the shorted solenoid or actuator isn’t found and repaired, the voltage overload it creates may damage the replacement PCM, too. As for environmental factors, water is the main thing to avoid. If water gets inside a PCM, it can short circuits and set up irreversible corrosion that ruins electronic connections.

What are the symptoms of a bad PCM?

Erratic or Random Shifting One of the most serious PCM failure symptoms is irregular shifting. This generally happens because of a faulty sensor, or because water has damaged some of the circuits in your car’s PCM or TCM. If your automatic transmission vehicle isn’t shifting normally, take it to a mechanic immediately.

What should I do if my PCM is not in stock?

If a particular PCM is not in stock or is unavailable, you can often send the old PCM to a remanufacturer for repair. Turn around time is typically a few days and the cost is the same as selling him an exchange unit from stock (except there’s no core charge). Some PCMs, though, may not be repairable.

Why is my PCM not working so well?

One function of your PCM is to work with the ECM and TCM to control your fuel-to-air ratio and decide when to shift gears. If either of these functions isn’t working optimally, your gas mileage will suffer. Of course, there are other reasons for poor gas mileage as well.

When to replace your PCM ( and when not to )?

The onboard computer is the brains of the engine control system, so when the brain isn’t functioning correctly neither is the engine or anything else that the microprocessor controls – which may include the charging system, transmission, various emission controls and communications with other onboard control modules.

How to change my Primary Care Manager ( PCM )?

In the Mail. Mail a TRICARE Prime Enrollment, Disenrollment and PCM Change Form to your regional contractor with the new PCM’s name and address (mailing address is found on Page 3 of the form). You only need to complete the part of the form related to the PCM change.

Can a PCM be a mechanical part of the engine?

Because ECMs are an electrical part, not a mechanical part, a lot of mechanics overlook possible ECM problems altogether. This can lead to costly repairs of other engine components, with owners sinking hundreds or even thousands of dollars into their vehicle while problems continue to persist.

When to replace the Powertrain Control Module ( PCM )?

When replacing the Powertrain Control Module (PCM) on a PATS-equipped vehicle, a parameter reset or relearn procedure must be performed after the PCM is installed. Vehicles with PATS will not start until this on-car procedure is successfully performed.

Why is my engine not responding to my ECM?

This can happen for any number of reasons, but usually, it’s a problem with your engine timing. While that function is directly controlled by the ECM, your PCM may also be at fault, since the ECM requires feedback from the PCM to adjust timing. 6.

Can you swap in a used PCM, ECM or module?

Can you swap in a used PCM, ECM, or module from a junkyard? The short answer is NO, you cannot swap in a used PCM, ECM or module from a junkyard. Even if the part number on the used PCM, ECM or module is exactly the same, that doesn’t mean it’s programmed properly.

Can a PCM be programmed to the VIN code?

Even if the part number on the used PCM, ECM or module is exactly the same, that doesn’t mean it’s programmed properly. On most late model cars and trucks, the PCM, ECM, or module MUST be programmed to your vehicle’s VIN code and build code.

Why does my car not start with a new computer?

I put a new computer box in the car now it won’t start the old computer box was causing problems so I changed it and had a new one shipped and put it in and now and nothing’s happening won’t click current nothing Batteries Not Dead power comes on just won’t start help please My car has 140000 miles. My car has an automatic transmission. Hi there.

What to do when your computer won’t start?

Check the battery cables to see if they are tight and clean. Check the wire connections to the starter solenoid on the starter and make sure that they are tight and clean. If you need further assistance with the no start situation after replacing the computer, then seek out a professional, such as one from Your Mechanic, to help you.

Why do I need to Reset my ECM?

If your check engine light comes on then chances are there may be an internal electrical issue within your vehicle that must be addressed. Before replacing any parts you want to reset your ECM to ensure that part replacements are absolutely necessary. There are a few ways to reset your Engine control modules.

How to reset the engine control module with no hassle?

Disconnect the battery and Switch the ignition key to the on position for about 15 minutes should reset the ECU Can a ECU be reset? Yes, all ECU (Engine Control units) can be reset and be should reset once per manufacturer’s guideline for a smooth relearn process or upon installing a replacement unit. How do I reset my Ford PCM?

How to reset the engine control module ( ECU )?

The 2 most common ways to reset your car computer is by either unplugging the battery or by resetting the fuse related to the engine control module Will disconnecting battery reset ECU? Disconnect the battery and Switch the ignition key to the on position for about 15 minutes should reset the ECU

Do you have to relearn Pats to replace PCM?

Replacing PCM only — A or D type PATS If only the PCM is being replaced on a PATS control function type A or D vehicle, no relearn is required (please refer to the Ford PATS chart to determine PATS type). Simply put the original key in the ignition, turn to ON or RUN and wait for 20 seconds.

When does ECM / PCM need to be reprogramed?

Then, confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. If the immobilizer… If your vehicle uses DOT 5 (silicone-based) fluid, the flush interval is much, much longer than 2 years or 32,000 miles.

Where can I find the Ford PCM manual?

Go to www.motorcraftservice.com 2. Access your subscriptions 3. Select “Reprogramming and Initialization” 4. Select the “Initialization (PATS) Information” section 5. Then select and download the Passive Anti-Theft System Chart 6. Locate and download the user manual in the “Ford Module Programming Application” section.

What to do if your car computer is no programmed?

If the vehicle was no programmed, you will have to get it programmed at a dealership. If the computer was programmed, then check all of the connections to the computer and make sure that the grounds are hooked up. Check the battery cables to see if they are tight and clean.

Can a PCM be installed in the same car?

Many PCMs appear to be exactly the same on the outside (same sized box and connectors) but may be wired or calibrated differently inside. If the wrong PCM is installed in a vehicle, it may run but probably won’t run well. Close enough isn’t good enough when it comes to replacing PCMs. It must be the correct replacement for the application.

What to do if your car wont start after a battery replacement?

Hey, anything can happen. There’s a (miniscule) chance your replacement battery is toast. You can take it to an auto parts store and have them test it. Keep in mind that this problem is likely only if your car isn’t turning over at all. We hope this guide has helped you!

How to reset PCM and check engine light?

First, park your truck and turn it off. Pull the hood lever under the driver’s side dash, and then pull the safety catch on the front of the hood to open it. Find the power distribution center (PDC); it will be a black box near the battery. Unlatch and open the cover of the PDC.

How often do powertrain control modules need replacement?

The PCM is a vital computer, and with this component sending erroneous signals, the vehicle will most likely never start, or the engine will randomly shut off. If a vehicle is responding very strangely to driver inputs, the vehicle should be towed to a repair facility. How often do Powertrain Control Modules need replacement?

How does the Powertrain Control Module ( PCM ) work?

The powertrain control module (PCM) is a small computer that monitors all engine control operations in real time. It uses a large network of sensors, solenoids, sending units, and other electronic components to both receive and send information which enables the vehicle to run at peak performance.

Can a damaged PCM cause an automatic transmission to not shift?

Transmission shifting problems: Another common system of a damaged PCM is an automatic transmission that does not shift correctly. The PCM monitors and controls the shifting functions of a modern automatic transmission. In older vehicles, this function falls on the TCM.

How does the PCM work in a computer?

This onboard-computer monitors and controls the functions of each system for optimal efficiency. The PCM receives data by way of a series of sensors that relay the information into the PCM.

How to get your PCM back on your car?

Engine… Step 1: Find the PCM you need from the dropdown list above, so we can get your vehicle back on the road in no time. Step 2: Consult with our experts to learn how to install your repaired or replaced auto computer. A process as easy as it sounds.

How much does it cost to replace a PCM?

According to RepairPal, the average cost of a PCM replacement can come out anywhere between $885 and $966, although dealership prices can be as high as $1,600 in parts and labor. But why go to a dealer? Would you go to your dealer for an oil change, or tire rotation?

How do you reset the PCM on a Ford?

Open the hood of the Ford. Loosen the lock nut located on the negative battery cable connector with a socket and ratchet. Pull the connector off the negative battery terminal. Wait for 20 minutes while the PCM bleeds off the electricity it stores for backup power. Once the power drains from the PCM, it resets.

What causes a PCM to fail in a car?

PCMs are rated to last far, far longer than any of your car’s sensors, so their failure is usually caused by other issues in your car’s electrical system, such as power surges. If you don’t want to find yourself back in the shop three months later replacing your PCM again, ask your mechanic to find out why it failed to begin with.

What happens when you replace the PCM in a car?