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PCM issue

Tiny
KKROHN
  • MEMBER
  • 2006 MAZDA 6
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 90,000 MILES
Hello,
I recently had my engine replaced in my car. When I got it back the first time, the check engine light came on and they told me they had to reprogram the PCM. Let me add that the car stopped working and the ABS off was lit and the slip light was on. I picked it up after it was reprogrammed, and it ran fine for about thirty miles. When I approached an exit ramp the light came back on. I called the company and said it might be an intermittent PCM and throttle body issue. What is the next step to get this permanently fixed?
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Saturday, June 21st, 2014 AT 11:16 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
If there was not a PCM issue prior to the engine replacement, chances are that is not the problem now. Question, was the engine replaced with the same year make and model engine? Do you know what the trouble codes are that set the check engine light?
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Saturday, June 21st, 2014 AT 8:14 PM
Tiny
KKROHN
  • MEMBER
  • 4 POSTS
So the engine that was used was the same year 2006 and it is a Mazda 6 non turbo engine. Per the mechanic who reprogrammed the engine all of two and a half weeks ago, he was saying the light might come on indicating the intermittent PCM issue and throttle body issue. The thing is my car locked up Friday night and had it towed back to my apartment. The next morning I went to check the car and the issue was resolved. I could drive it an everything. So I guess I am confused on what else we can do besides re syncing the engine with the computer. As for the codes, I do not know.

Thank you
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Sunday, June 22nd, 2014 AT 4:59 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
What do you mean it "locked up?" As far as the codes, if the check engine light is on, take it to a nationally recognized parts store and have them scan it for codes. Most will do it for free and it would be helpful for me to guide you.
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Sunday, June 22nd, 2014 AT 8:36 PM
Tiny
KKROHN
  • MEMBER
  • 4 POSTS
Locked up, I mean that it would not go above 3,000 rpm's even with the pedal to the floor. If I tried giving it gas in first it would stall out. The engine light was on so was the ABS OFF and the vehicle slip. So at this point I will take it to a parts store and see what they can do for scanning the codes.
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Monday, June 23rd, 2014 AT 5:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Okay. I thought the engine seized. Let me know what you find.
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Monday, June 23rd, 2014 AT 8:00 PM
Tiny
KKROHN
  • MEMBER
  • 4 POSTS
So, I went to O'Reilly auto parts and they ran my engine, came up with a couple codes, but all of them regardless of the fault had that the PCM had failed. I just had this engine put in my car. I call the company who worked the issue and put the new engine in, and upgraded the computer. When I called him yesterday, he says, "Let's hope it is a computer issue." I do not know what else I am supposed to do. So it is back at the shop for the fourth time with this issue. Besides him upgrading the PCM what would the next step be?
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Wednesday, June 25th, 2014 AT 5:33 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Well, it would be odd for the PCM to fail just because the engine was replaced. The only think I can think of is one of the following:

different engine requiring different computer or sensor issue.

Damage to the PCM wiring when engine was replaced.

Lost ground to PCM during work.

Bad PCM.

Can you tell me the codes that they found?
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Wednesday, June 25th, 2014 AT 1:34 PM
Tiny
MR PICKAXE
  • MEMBER
  • 1 POST
Just had my engine done in my six and it came back without a pulse on the cluster, ABS light Traction control light and brake lights were all on, turned out the replacement company mangled the fitting on the ABS module, I hold that many pin connector on today with clamps.
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Monday, April 30th, 2018 AT 5:20 PM

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