How Much Does ECM Replacement Cost?


Written by:  Howmuchisit.org Staff

The engine control module is a mini computer that controls many of the vehicle’s functions.  The engine computer, or PCM/ECM, manages the performance of the engine, the emissions system, and it controls the transmission, among other things.

How much does an ECM replacement cost?

Usually, a brand new ECM part will cost you around $400 to $2,200.  The labor usually won’t be included in this price tag as this is the price of the part only.  The cost will depend on your car’s make and model, as well as the mechanic you choose if you decide to have it professionally installed.  Fortunately, in some cases, it can be re-programmed and can cost a lot less.  This will all depend on your situation.

A remanufactured ECM can cost you anywhere from $200-$400.  If you choose to go this route, make sure the part comes with a factory warranty or is 100% certified.

If the ECM just has to be reprogrammed and/or analyzed, it can cost $150 to $300. Repairs should always be less than $750.

To have the part installed, add an additional $350 to $1,500 to the prices mentioned above.

Howstuffworks.com says the repair can cost hundreds or thousands of dollars.  It can get expensive if your car’s security system or anything else electronic needs to be modified.

ECM replacement overview

The ECM is considered the “brain” of the car.  It’s going to analyze information to manage and control the engine’s performance.  Coming from different sensors, it will send the data to the ECM.

Some functions will include measuring the air/fuel ration, ignition timing, idle speed and valve timing.  The air/fuel ratio will measure the air/fuel mixture inside the engine’s cylinder during combustion.  Depending on factors, it will automatically inject the right amount of fuel.  The ignition timer will correct spark plug timing and sequencing to prevent knocking.  While the car is in idle, the idle speed will make sure the car isn’t wasting unnecessary fuel while in the idle position.  Lastly, the valve timer will adjust the opening of the valves to allow the right amount of air.

During the ECM procedure, a mechanic will first locate the ECM.  This will vary depending on your car’s make and model, but oftentimes, it will be located in the engine compartment, under the seats or in the floorboards.  The ECM will be held in place by bolts and brackets, and these will be removed so the mechanic is able to disconnect the plugs behind it.  Once free, the memory chip (PROM), if the car has one, will be removed, and a new one will be installed.  The plugs will be reconnected and tested to see if the “check engine” light disappears.

The entire process should take 30 to 60 minutes.

Tips to know

Bring your car into a local auto parts shop as many offer free diagnostic tests for your ECM.  This will let you know whether there is a need to replace or just repair the ECM.

Common symptoms of a faulty ECM may include several unrelated codes, the vehicle may not start properly or the engine is performing poorly without setting codes.  Also, if your check engine light is one and it won’t go off, there’s a good chance there’s a faulty ECM.

Newer cars will have an upgradeable PCM, so be sure to check your owner’s manual to learn how you can upgrade the software.

CarsDirect.com notes that when you take your car in for a repair and/or a diagnosis, make sure they are using the latest software to diagnose your problem.  Most dealerships, especially the one you purchased your car from, will often have the latest technology to check out the problem.

ECM vs. PCM:  What’s the difference?

This is a question often brought up, and the answer is relatively simple.

This is a question often brought up, and the answer is relatively simple.  The ECM is known as the engine control module and can be referred to as ECU as well.  As noted above, this is the computer which will take the incoming sensor data to alter the functioning of the electronic system.   It can gather information from the intake, cooling system, exhaust and internal components to judge the condition of the engine.

The PCM stands for “powertrain control module,” and similar to the ECU, it can control the engine and transmission in one unit to better coordinate the function for better fuel economy.  Most units will contain a separate TCM and ECU, and each one will have its own processor.

How to replace ECM computer

How can I save money?

The best way to save money is to get a used ECM from a salvage yard, which can cost you about $200.  This is generally going to be cheaper than your local dealer.  Again, ensure that the ECM is certified so that it does not fail on you too quickly.

There are companies which also offers rebuilt computers that can cost $400 or less.  A great place to check for these is auction sites such as eBay and Craigslist.

It can also save money to buy at nearby stores rather than online stores in order to save on shipping charges.

Look for service providers that offer free installation when you buy an ECM.  Also, check with your car’s warranty.  Something such as this may be covered if it is deemed to be faulty.

Do not decide to replace the ECM right away.  Try going to service providers which may offer repairs to the malfunctioning ECM rather than replace the whole unit.

If you have knowledge on how to install ECM and are capable of doing the installation yourself, this can save you a lot of money as well. However, keep in mind you should have knowledge with circuit boards and can be a very complicated process.

With any car repair, try to get as many quotes as possible.  Most will be able to give you a “ballpark” over the phone if you know for certain it’s your ECM.


Advertising Disclosure: This content may include referral links. Please read our disclosure policy for more info.

Null

Average Reported Cost: $702.5

100 %
0 %
Less Expensive $1 $1.5K $3K $5K $6.5K More Expensive $8k

How much did you spend?

Was it worth it?  

  1. Chris (San Jose,  California) paid $705 and said:

    Replaced at dealer,had no choice for reasons I can’t explain.

    Was it worth it? Yes

  2. James C. (Clarksville,  Tennessee) paid $700 and said:

    Trying to keep my car as long as possible, it is a 2012. Died right after a road trip. Replaced at the dealer, they gave me a brand new car as a loaner until mine was fixed. It was a lot but I would rather have a new one than worry about replacing it again down the road.

    Was it worth it? Yes

About Us | Contact Us | Privacy Policy | Amazon Affiliate Disclosure
Copyright © 2022 | Proudly affiliated with the T2 Web Network, LLC
The information contained on this website is intended as an educational aid only and is not intended as medical and/or legal advice.