HELP 2010 CX-7 in Limp Mode
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Junior Member
Joined: Feb 2025
Posts: 2
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From: Seattle, WA
HELP 2010 CX-7 in Limp Mode
Hey Everyone,
New member here. My Son's 2010 CX-7 has gone into limp mode. Initially found battery swollen and corroded. Replaced battery and had AutoZone run the codes. Its throwing a ton of them as listed here. By the way, was running perfectly until this happened yesterday.
Electronics really isn't my thing, but usually can figure it out with minimal codes. Never saw 12 at once before. Really appreciate any guidance you guys may have.
PO140
PO442
PO455
PO606
PO613
P1450
UO121
UO155
PO841
UO401
U2023
New member here. My Son's 2010 CX-7 has gone into limp mode. Initially found battery swollen and corroded. Replaced battery and had AutoZone run the codes. Its throwing a ton of them as listed here. By the way, was running perfectly until this happened yesterday.
Electronics really isn't my thing, but usually can figure it out with minimal codes. Never saw 12 at once before. Really appreciate any guidance you guys may have.
PO140
PO442
PO455
PO606
PO613
P1450
UO121
UO155
PO841
UO401
U2023
Last edited by IANSDAD58; Feb 20, 2025 at 08:11 PM.
Senior Member
Joined: Oct 2018
Posts: 10,613
Likes: 231
From: Northern California
Welcome to the forum.
For a DIY only …….
12 codes ….
You have cause and effect going on.
Connect scanner to the ECU reset both the current DTCs and check permanent files, note them . Then go into I/M monitors see what is in fault, which is like 2 or all of them, and reset them.
Then start the Infineon and as soon as the check engine light is activated turn the engine off and go get the current DTCs which should only be a couple. Those will be your first target to solve why they came on.
Cross your figures that you don’t have a toasted ECU.
For a DIY only …….
12 codes ….
You have cause and effect going on.
Connect scanner to the ECU reset both the current DTCs and check permanent files, note them . Then go into I/M monitors see what is in fault, which is like 2 or all of them, and reset them.
Then start the Infineon and as soon as the check engine light is activated turn the engine off and go get the current DTCs which should only be a couple. Those will be your first target to solve why they came on.
Cross your figures that you don’t have a toasted ECU.
Last edited by Callisto; Feb 20, 2025 at 11:18 PM.
Thread Starter
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Junior Member
Joined: Feb 2025
Posts: 2
Likes: 0
From: Seattle, WA
Thanks for the reply and insight. Been traveling extensively and haven't been able to reply/update. So, after much searching on this and other sights there was a suggestion to clear the codes, and then take off negative cable only to ger out of limp mode. Only had a borrowed scanner, so unfortunately he didn't re run the codes. Anyway, the car ran perfectly for about a week, then died and returned to limp mode.
Less codes now, but looks like pcm/ecm which on this car are the same thing?? Sorry for the newbie question. Also, do you know if you have to "program" a replacement module, or can it just be installed?
Obviously less $$$ to DIY than have it wind up in a shop.
Less codes now, but looks like pcm/ecm which on this car are the same thing?? Sorry for the newbie question. Also, do you know if you have to "program" a replacement module, or can it just be installed?
Obviously less $$$ to DIY than have it wind up in a shop.
Senior Member
Joined: Oct 2018
Posts: 10,613
Likes: 231
From: Northern California
I should warn you, not to take advise to disconnect the battery terminal to clear DTC, turn off the engine check lights or other things that that will still remain in the ECU like the ECU coding to protect the engine otherwise called limp mode.
Doing so and often creates other additional and sometimes costly repairs .
Always consider who your source of service information is coming from. Remember if you muck up your vehicle they are out nothing.
Doing so and often creates other additional and sometimes costly repairs .
Always consider who your source of service information is coming from. Remember if you muck up your vehicle they are out nothing.
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