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2018 Honda Civic — clunk when changing from reverse to drive

CleanBuyer879Community StarterJun 23, 20262018 Honda Civic SiWashington DC
2018 Honda Civic Si, about 94,000 miles. There is a single clunk when changing direction at low speed, especially reverse to drive. No vibration while cruising. What would you inspect first: mounts, driveshaft play, differential mounts or CV joints? I am in Washington DC.
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21 replies

CleanBuyer879Community StarterCommunity StarterJun 23, 2026permalink
OP update: scanned the 2018 Honda Civic again and still only have the one pending code, no new lights. No warning lights, which is why I'm documenting it.
CleanBuyer879Community StarterCommunity StarterJun 23, 2026permalink
Cleared nothing. I want service to see the alert on the 2018 Honda Civic first. That's my plan before I call anyone.
CleanBuyer879Community StarterCommunity StarterJun 23, 2026permalink
Cleared nothing. I want service to see the alert on the 2018 Honda Civic first. Wrote this up on my lunch break.
CanyonShopper955Community StarterCommunity StarterJun 23, 2026permalink
Ask what changed right before it started. Loaded-suspension checks on the 2018 Honda Civic catch play that a wheels-hanging inspection misses. Save the big job until that test fails. If you share a photo of the worksheet, easier to sanity-check. This is the version I'd tell a friend.
BoxerScoutCommunity StarterCommunity StarterJun 23, 2026permalink
Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2018 Honda Civic does it — then decide on parts. That's the branch I'd chase this week. On “clunk when changing from reverse to drive,” that was the fork that mattered for me. This is from a 2018 Honda Civic in Washington DC with 94,000 miles. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. If it repeats twice more I'll book time.
ManualDaily983Community StarterCommunity StarterJun 23, 2026permalink
Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2018 Honda Civic catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. On “clunk when changing from reverse to drive,” that was the fork that mattered for me. I'd want that in writing, not as a promise. This is the filter I use when the thread starts repeating itself. I'm keeping receipts and dates in one folder.
DealGalCommunity StarterCommunity StarterJun 23, 2026permalink
Intermittent stuff lies if you only catch it once. Swap the cheap/easy piece first on the 2018 Honda Civic and see if the fault moves. Save the big job until that test fails. On “clunk when changing from reverse to drive,” that was the fork that mattered for me. Do that first. Not driving it hard until I know more.
CleanBuyer879Community StarterCommunity StarterJun 24, 2026permalink
It did clunk when changing from reverse to drive twice this week, both times after sitting. No change in mileage feel. Happens in gear, not in park, for what that's worth.
ColdStartDIYer320Community StarterCommunity StarterJun 25, 2026permalink
Fair point. Counterpoint: Write temp, speed, and in-gear vs coast when the 2018 Honda Civic does it — then decide on parts. Don't erase codes until someone who can help has seen them. If they can't show the line item, I assume it's hiding. If the story changes I'll post the new data.
PistonHunterCommunity StarterCommunity StarterJun 24, 2026permalink
I wouldn't throw parts yet. Move a coil or plug on the 2018 Honda Civic if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. Trying not to diagnose from the couch.
ManualDaily983Community StarterCommunity StarterJun 24, 2026permalink
I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2018 Honda Civic is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. This is from a 2018 Honda Civic in Washington DC with 94,000 miles. I'd want that in writing, not as a promise. Might be overthinking it, but I'd rather overthink than overspend.
RoadTripWrench299Community StarterCommunity StarterJun 24, 2026permalink
This is usually cheaper to test than to guess. Move a coil or plug on the 2018 Honda Civic if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. This is from a 2018 Honda Civic in Washington DC with 94,000 miles. Run the total, not the monthly, before you commit. I refuse to clear codes until someone else sees them.
CanyonShopper955Community StarterCommunity StarterJun 24, 2026permalink
If it were in my driveway, write temp, speed, and in-gear vs coast when the 2018 Honda Civic does it — then decide on parts. You'll know quickly if you're on the wrong tree. This is from a 2018 Honda Civic in Washington DC with 94,000 miles. Post the numbers (or the code) and people can get more specific. Might be overthinking it, but I'd rather overthink than overspend.
TrailGeek611Community StarterCommunity StarterJun 24, 2026permalink
This is usually cheaper to test than to guess. Move a coil or plug on the 2018 Honda Civic if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. I'd want a dollar figure or a measured spec, not 'should be fine.' Wrote this up on my lunch break.
CleanBuyer879Community StarterCommunity StarterJun 24, 2026permalink
Checked the easy stuff on the 2018 Honda Civic and found one clue worth chasing before I book a shop. If it repeats twice more I'll book time.
PistonHunterCommunity StarterCommunity StarterJun 25, 2026permalink
Same neighborhood, different next step: A pressure test beats staring at a dry driveway if the 2018 Honda Civic is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. That's my plan before I call anyone.
CleanBuyer879Community StarterCommunity StarterJun 26, 2026permalink
Tried a second charger / second scan and the story on the 2018 Honda Civic didn't change. If the story changes I'll post the new data.
RoadTripWrench299Community StarterCommunity StarterJun 24, 2026permalink
Log the conditions before you spend. Capture voltage while the 2018 Honda Civic is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. On “clunk when changing from reverse to drive,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. I'm keeping receipts and dates in one folder.
DealGalCommunity StarterCommunity StarterJun 24, 2026permalink
Log the conditions before you spend. Two 2018 Honda Civics can feel identical and have different causes, so measure before you copy someone else's repair. If the cheap test changes it, stop and reassess. On “clunk when changing from reverse to drive,” that was the fork that mattered for me. That's the whole play. This is the filter I use when the thread starts repeating itself. I'm keeping receipts and dates in one folder.
CanyonShopper955Community StarterCommunity StarterJun 24, 2026permalink
Start with the test that can prove you wrong. Get a real battery/charging test on the 2018 Honda Civic, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. Happy to compare notes if your setup is different. If this is nothing, great. I want that in data.
CleanBuyer879Community StarterCommunity StarterJun 24, 2026permalink
I went back under the 2018 Honda Civic and it only happens after a heat soak, not on a cold start. Next check is the cheap one I can do in a driveway.
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