What Does the Engine Code P0605 Mean?
Engine code P0605 indicates a problem with your Engine Control Module’s memory, which could impact your ability to drive.
Written by Joshua Levy
Reviewed by Melanie Reiff
When your car shows the P0605 engine code, it means there’s a problem with your Engine Control Module’s (ECM) Read-Only Memory (ROM). This could make it difficult to start your engine, and it might even decrease your fuel efficiency.
Diagnostic trouble codes (DTCs) can help you find out what’s wrong with your car. But they can only tell you where to look. It’s important to understand the potential causes and symptoms of each code to properly diagnose and fix the issue.
It can be hard to decode DTCs, so the
car insurance
comparison and broker app Jerry
has collected all the information you need to know about engine code P0605.Jerry sends free alerts to keep your car up-to-date so you can avoid costly repairs
* checking your rate won’t affect your credit score
Get ahead of my car maintenance
* checking your rate won’t affect your credit score
What does the engine code P0605 mean?
Definition: Engine code P0605 means that there’s a problem with your ECM’s ROM.
Your car’s ECM facilitates nearly everything—from the fuel and ignition systems to the transmission and traction control systems. Problems in your ECM’s memory can lead to issues in fuel efficiency, gear shifting, and handling. Given its role in fuel management, a P0605 engine code could also cause you to fail emissions tests.
MORE: How to pass emissions testing
How much will it cost to fix?
Diagnosing the issue in a P0605 engine code typically takes around an hour, which should cost somewhere around $75 to $100 depending on your auto shop’s rates. Since you shouldn’t need to replace any parts to repair this error code, the only additional costs should be labor charges for your mechanic's time.
What can cause the P0605 engine code?
While a P0605 engine code could be related to larger problems in your engine, it’s typically caused by a lack of voltage to the Powertrain Control Module (PCM). As a result, this issue usually arises in situations where your
battery dies
or is disconnected.Although less common, engine code P0605 could also result from the following:
- Defective PCM ROM memory module
- Defective PCM ground circuit(s)
- Defective PCM controlled output devices
Common symptoms of the P0605 engine code
Since the ECM is connected to so many systems in your car, you’ll likely see a variety of symptoms when it fails. Here are some of the most common signs of a P0605 engine code:
- Failed emissions inspection test
- Antilock braking system warning light turns on
- Problems shifting gears
- Lower fuel efficiency
In some rare situations, your engine may even misfire or shut off at a stop as a result of engine code P0605.
How serious is the P0605 engine code?
Engine code P0605 often causes problems that impact your ability to drive. As a result, the code is very serious and could endanger you on the road.
It’s best to have a professional diagnose and repair the issue as soon as possible to avoid any potential problems. Additionally, failing to address a P0605 engine code could cause you to fail your emissions test, which could prevent your car from being registered.
MORE:
How to register a car
Can I fix the P0605 engine code myself?
Unfortunately, you cannot fix a P0605 engine code by yourself. While you may be able to solve the problem yourself if the issue is related to strengthening electrical connections in your ECM, identifying such an issue requires specialized knowledge of the situation.
Additionally, fixing the ECM requires the following:
- Specific tools for installation
- Specialized knowledge of ECM software
While it’s rare, you may also need to
replace sensitive electrical components
. If possible, you should let a professional repair your P0605 engine code.Finding insurance for your vehicle
While you’re waiting for your mechanic to repair your P0605 engine code, take a minute to save on car insurance with
Jerry
. As a
trustworthy licensed insurance broker
, the Jerry app helps users find and compare competitive car insurance quotes from over 50 top providers like Progressive
and Allstate
for free. When you find a plan you like, Jerry can help you switch policies and even cancel your old one. No paperwork, phone calls, or headaches required.Jerry helps users save an average of $887 a year on car insurance—and it only takes a minute to sign up.
“Jerryhad a super simple app that was easy to navigate. And their terrific customer service made everything even easier. Plus I saved $700 in a single year.” —Lucia M.
RECOMMENDED
Thousands of customers saved on average $887/year on their car insurance with Jerry
This app is great, but the customer service is even better! Not to mention convenient! My husband and I got the lowest rate (much lower than the rates I was finding online through my own searches), quickly, and pretty much all through text message! Thank you so much for a hassle free experience👍
Gabriella R.
Find insurance savings
4.7/5 Rating on App Store
Estimate your repair costs for free with GarageGuard™
Simplify your car maintenance with Jerry.
4.7You might also be interested
We value your privacy
