Bad PCM Causes
Engine performance issues
.
Engine misfiring or stalling
and overall poor engine performance are common indications of problems with the engine control unit. Modern vehicles have various sensors that operate within a given range to ensure the intended functions of the engine.
Can I drive with a bad PCM?
A failed PCM or TCM
can cause the car to get stuck in gear
, which can be a serious safety issue. It can also lead to costly transmission damage.
How do you know if your PCM is bad?
- Your “check engine” light is on.
- Other warning lights may be on, including traction control and ABS.
- You lose fuel economy for no apparent reason.
- Your car stutters when starting, requires multiple attempts, or won't start at all.
- Stuttering or stalling during idling.
Will a bad PCM throw a code?
The PCM should give you a code for
P0600
through P0606 indicating that the computer has a processor error. However, if the PCM is corrupt, then just like a desktop computer, there is no accessing anything and no codes are put out for the computer would have no way of sending a signal.
How much does a PCM repair cost?
In some cars, there are multiple computers, and with other cars, there are just a few. The PCM controls more than 100 factors in your car, and for that reason, is very important – and expensive. A typical pcm replacement cost comes to
between $500 and $1,500 on average
.
How long does it take to replace a PCM?
The process takes
around about half an hour
, but keep in mind that most auto-electricians charge you for at least one hour of work. PCM reprogramming is also one of the few times we'll recommend a dealership over an independent mechanic.
Can AutoZone test my ECM?
If you take your car or truck in to the dealer or an authorized mechanic for service, your vehicle should have a
working PCM/ECM installed
. Otherwise, you may want to pursue another round of OBD-II diagnostic testing at AutoZone.
Can you fix a PCM?
PCMs are
not rebuilt
in the same way that alternators and water pumps because there are no mechanical parts that wear out. Remanufacturing in this case usually means testing the computer, isolating and repairing any faults that may be found, then retesting the computer to make sure everything works correctly.
Is a PCM and ECM the same thing?
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.
How do you troubleshoot a PCM?
- Locate your vehicle's PCM. …
- Look specifically at the wiring harness. …
- Locate your vehicle's diagnostic data port. …
- Connect your OBD-II scanner to the diagnostic data port.
- Push your key into the vehicle's ignition cylinder. …
- Watch the OBD-II device's read-out screen for the codes.
Can a PCM be reset?
You can either reset your FORD PCM through the fuse box or the simple yet effective way that is to just
unplug the battery
.
What does flashing a PCM do?
Reflashing is a process where you electronically transfer approved files from a vehicle manufacturer's website using a diagnostic connector. This process has many names. You might hear the terms PCM programming, PCM reprogramming, PCM flash, or PCM reflash. … They all refer to
an upgrade of your PCM's microchip
.
What all does the PCM control?
The PCM controls ignition timing, fuel delivery, valve timing in engines with Variable Valve Timing),
emissions functions
, turbo boost pressure in turbocharged engines, idle speed, throttle position and cruise control.
How do you know if you need a new PCM?
Bad PCM Causes
Engine performance issues
.
Engine misfiring
or stalling and overall poor engine performance are common indications of problems with the engine control unit. Modern vehicles have various sensors that operate within a given range to ensure the intended functions of the engine.
Can I put a used PCM in my car?
Most PCM's I know of do not let you reprogram them to a different vehicle VIN number to prevent theft problems. … For some years, some manufacturers allowed reprogramming so you would need to have the dealer advise you if this particular vehicle and PCM can be reprogrammed to another vehicle.
Can I flash my own PCM?
Current owners of Dodge vehicles built and sold
before
2004 can perform their own PCM reprogramming, but they need some specific equipment on hand as well as a digital program that is used to convey information to the module. PCM flash tools include: 1.
