I need help with 2017 G23 H6 not wanting to run under load/throttle

[SilentSeven]

I think you're wise to get this started. Asking for a plan B that has some $$ significance (ie / new motor and harness if problem isn't solved soon) and near term timelines will incentivize Nautique and the dealer to figure out the immediate problem faster. Factory diagnostic assistance, prioritized parts, etc.

I see you're in Alabama...I'd l also look into state consumer protection lemon laws and see if they might apply as that could also be a motivator to get a quick resolution.

Hopefully none of this is required...but it moves everyone to focus on getting your problem solved promptly and you back on water this spring!

[zmnypit]

1/11/22- update. I text the manager last Wednesday to see if they swapped the ecm like I was told. He said no, they were waiting on PCM to send the next set of tests to perform. I was told PCM wanted to test the wiring harness again. (The one they just replaced smh). I immediately called him and gave my .02 on how this makes no sense when you have an ecm available not to try and its the one thing you haven't tried/replaced. At very least it can then be ruled out if it doesn't work. He agreed but said they have to do what PCM tells them to do.

I called my contact at PCM I've been working with and she saw no such instructions were given on the ticket. The wiring harness ticket was closed and they were unware the issue was unresolved. I explained all the above to her and she was to schedule a meeting with the PCM techs/warranty dept then reach out to the dealer.

No less than an hour later I received a video of my boat running on the hose with the message "After talking to you, I told the guys go ahead and swap the ecm and it runs great on the hose. We have a few leaks to address then lake test after lunch tomorrow" The following day they took it to the lake and it ran flawlessly so it seems the ecm was bad this whole time. At this point I want to be happy but then again wasted 6months and all summer last year for something I suggested they check in July 21. I still have the text I sent to him then. Hopefully the last update as now just waiting on the ecm to arrive.


TLDR: ECM swapped from another boat, runs great now.

[SilentSeven]

Nice move inserting yourself in the middle to confirm the left hand is talking to the right hand. Sad to find they were not.

Due to the extended period of the problem, I would ask for a water test with the service manager to confirm the issue is indeed resolved.

[zmnypit]

Nice move inserting yourself in the middle to confirm the left hand is talking to the right hand. Sad to find they were not.

Due to the extended period of the problem, I would ask for a water test with the service manager to confirm the issue is indeed resolved.

I plan on it. He did send me a video of them on the lake though so I know it was on the water.

[charlesml3]

So it took from June of 2021 to January of 2022 to diagnose... a bad ECM. A part that could have been swapped in to fault-isolate the problem in less than an hour.

Now don't get me wrong. I'm VERY familiar with the troubleshooting process and I know it's unfair to find the solution and then "witch hunt" back but this seems like it should have been an obvious test. Especially for a dealer who had access to a spare. It sounds to me like the mechanics there completely deferred all of their decisions to PCM and "just did what they told us."

This type of troubleshooting is wildly inefficient. The engineers at PCM are relying on someone telling them what it does, how it sounds and how it acts instead of seeing, hearing and feeling it for themselves. It's entirely possible one of the mechanics at your dealer had seen this problem before and suspected it was the ECM but was told to only do what PCM told them to do.

-Charles

[zmnypit]

So it took from June of 2021 to January of 2022 to diagnose... a bad ECM. A part that could have been swapped in to fault-isolate the problem in less than an hour.

Now don't get me wrong. I'm VERY familiar with the troubleshooting process and I know it's unfair to find the solution and then "witch hunt" back but this seems like it should have been an obvious test. Especially for a dealer who had access to a spare. It sounds to me like the mechanics there completely deferred all of their decisions to PCM and "just did what they told us."

This type of troubleshooting is wildly inefficient. The engineers at PCM are relying on someone telling them what it does, how it sounds and how it acts instead of seeing, hearing and feeling it for themselves. It's entirely possible one of the mechanics at your dealer had seen this problem before and suspected it was the ECM but was told to only do what PCM told them to do.

-Charles

Hit the nail on the head. And to add to it once I got the dealership manager involved in July after getting the run around from the service manager I suggested to him via text message: Hey, if its not throwing any codes, diacom shows nothing wrong then possibly its a bad ecu? He told me possibly, they would check it. Few days later I received a text that they checked the ecu and its putting off the pulsating ground like its suppose to. End of story until last week.

[charlesml3]

Yea. The dealers have "Factory trained PCM Mechanics." Why bother doing factory training if all they're going to do is replace what PCM tells them to replace? The whole point of deep training is to give people with natural troubleshooting skills the "scaffold" to hang all of that technical training & knowledge. The two allow a good mechanic to fault-isolate until they find the problem.

The ECM has a good bit of on-board diagnostics but it can't track every single value and counter. It would be huge and not cost effective. So it tracks the ones it can. It seems that yours failed in a way that didn't trip any thresholds or it failed in a section that wasn't monitored by the OBD.

-Charles

[zmnypit]

2/4/22 - Final update and that is its finally back home in my possession. Alot of new parts (all un-needed with the exception of the ecu), A lot of waiting for nothing but its done and home. Now we wait for another couple months. Thanks to all who PM'd me and made suggestions in this thread. Much appreciated!

[Speedy]

Good to hear… don't forget to winterize


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[zmnypit]

Good to hear… don't forget to winterize


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Coastal edition so both manifold plugs removed and screener emptied. And it goes in a basement that never gets cold.

[Speedy]

Wife and kiddos will be happy this season


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[zmnypit]

Wife and kiddos will be happy this season


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Forsure. It was nearly a divorce last summer.

[Speedy]

If I was in your shoes, I would be tempted to take “her” for a cruise before putting it in the garage.


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[SilentSeven]

Congratulations on closing this chapter of the saga!

[Cpan13]

So will Nautique/PCM extend your warranty since it sat in a shop for a year?