P1607 and limp mode after swap to ECU

fushan0613

New Member
Joined
Sep 22, 2025
Posts
1
Reaction score
0
Location
China,Shanghai
Hi everyone, I have a Honda Accord CG5 2002 and I love her. I have completed an automatic to manual transmission swap, but I'm having some issues with the ECU and I need help. I'm from Asia, so English isn't my first language—my wording might be a bit odd, but I’ll try my best to explain.:)

After installing the manual transmission, I fixed the vehicle speed sensor issue, but the AT ECU is limiting me in 5000 RPM. So I bought an MT ECU from eBay. The process was a bit challenging, but it was worth a try. Its EPC is 37820-PAA-A04.

After it arrived in my country, I had someone reprogram the ECU. He mentioned that he bypassed the immobilizer and removed the security lock. I was able to start the engine, but it now shows a P1607 trouble code and goes into limp mode—I can’t rev past 3000 RPM.:eek:

Could this be a programming error? He didn’t mention anything about the VIN. Do I need to write the original car’s VIN into the ECU, or did I get a faulty MT ECU? Does anyone know what might be causing this?

I’d really appreciate any advice. Thanks a lot!

MEITU_20250101_112037450.jpg
 

BlkCurrantKord

Super Moderator
Joined
Sep 7, 2005
Posts
10,194
Reaction score
141
Location
Ohio
Sounds like a programming error. You may need to program the VIN into the ECU for it to function properly.
 
Back
Top