Honda Greiz Engine Cuts Out, Throttle Valve Issues?

Hey there! I have some experience working on cars and dealt with very similar symptoms on my 2016 Honda Civic 1.8L last year. The symptoms you're describing sound exactly like what I experienced. After multiple stalls and that annoying jerking during acceleration, I took it to my regular workshop. Turns out it was a faulty accelerator pedal module, cost me around 205 Euro to fix, including labor. After replacement, the car ran smooth as butter again. Do you mind sharing if you're getting any specific error codes? Also, have you noticed if the issue is worse when the engine is cold or warm? This info would help confirm if we're dealing with the same problem. BTW, if you have a Greiz, are you getting this serviced at a Honda dealer? They tend to be better with diagnostics for these specific issues.

Thanks for sharing your experience! Mine is also showing similar symptoms to what you described. I had my last service just 2 months ago at 88744 KM, and everything was fine until last week. The jerking is definitely worse when the engine is cold, especially during the first 10-15 minutes of driving. Haven't checked the error codes yet, but planning to get it scanned tomorrow. It's good to know about the accelerator pedal module, that's actually cheaper than the throttle valve replacement I was worried about. I've typically used an independent mechanic, but given what you've mentioned about Honda dealers being better with diagnostics, I might give them a shot this time. Thanks for the tip! Did you notice any warning signs before your module completely failed?

Hey again! Happy to help further with this! Yeah, looking at your symptoms, it's sounding more and more like what I dealt with. Before my accelerator pedal module completely failed, I did notice some warning signs. For about 2-3 weeks before things got really bad, my Civic would occasionally hesitate for a split second when pressing the gas pedal. It was super subtle at first, just a tiny problem that I almost ignored. The cold-start symptoms you're describing are spot-on with what I experienced too. Mine would act up really badly during those first few minutes of morning drives. It would sometimes even stall at traffic lights during that warm-up period, super annoying! Quick tip from my experience: when you get it checked, make sure they inspect the wiring harness connected to the pedal module too. In my case, there was some minor corrosion on the connectors that they cleaned up while doing the replacement. The mechanic said this could've contributed to the issue. After my repair, I've put on about 30,000 km with zero issues. Just keep in mind that if it is the pedal module, it's not really something you can repair, it needs complete replacement. But hey, at least it's cheaper than a throttle valve job! Let me know what the error codes show. I'm really curious if it matches what I had (mine was P2138 if I remember correctly).

I'll continue as with a natural conclusion to the conversation: Thanks so much for all the detailed information! That's really helpful about the warning signs, now that you mention it, I did notice those slight hesitations a few weeks ago but didn't think much of it at the time. Definitely going to check if my error code matches your P2138. I really appreciate the tip about checking the wiring harness too, will make sure to mention that specifically when I take it in. It's such a relief to hear that your fix has lasted for 30,000 km without any issues. Makes me feel a lot more confident about getting this sorted. Will update you once I get the diagnostic results tomorrow. Thanks again for taking the time to share your experience, it's been super helpful!