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New PCM pulls code P0602

Tiny
IMAFLYINGKIWI
  • MEMBER
  • 2000 SATURN SL1
  • 1.9L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 115,400 MILES
Replaced old PCM as it has been causing a headache of emission problems, seemed like the only solution left.
Purchased a plug and play PCM from Flagship One almost immediately the check engine light came on with code P0602 and the speedometer also doesn't work.
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Wednesday, August 7th, 2019 AT 8:48 AM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

This code is stating the PCM is not programmed. I attached the programming requirements. This will also explain why the speedometer doesn't work.

Let me know if you have more questions.
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Wednesday, August 7th, 2019 AT 4:55 PM
Tiny
IMAFLYINGKIWI
  • MEMBER
  • 6 POSTS
This is probably a stupid question. The company Flagship One sold me a programmed PCM all I had to do was plug and play so they said, the reason I decided to replace the PCM in the first place was because the old one kept pulling a P0446 and a P0404 cleaned throttle body replaced the EGR it seems like it was the only solution left. Any other ideas are welcome.
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Wednesday, August 7th, 2019 AT 5:27 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I would start with calling them and getting to the bottom of this because that is not what the PCM is telling you. As for the other issues, P0446 is an Evaporative emissions code. I attached the description and diag assistance. The P0404 is a code for the EGR. However, if you read the last portion of this code, it tells you to check the wiring and connectors. It does not tell you to replace the PCM for this code. Same with the P0446, it doesn't have a PCM as the cause. My guess, once you get the PCM programmed, these codes will return.

Run through these documents and tell me if you have questions about how it works. Once we understand how things work, we are more likely to fix them.
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Wednesday, August 7th, 2019 AT 6:18 PM

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