Diagnostics & Mystery ProblemsDiagnostic helpCommunity Starter

2013 Toyota Prius — metallic rattle for a few seconds after cold start

BatteryScout485Community StarterNov 19, 20252013 Toyota Prius ThreeBrooklyn
There is a short metallic rattle after the first cold start of the day, then it disappears once the engine settles. Warm restarts are quiet.
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34 replies

CamberPilotCommunity StarterCommunity StarterNov 19, 2025permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2013 Toyota Prius is losing coolant with no puddle. If the cheap test changes it, stop and reassess. That's the whole play. Make the next action something you can finish this week. Heat soak after errands is the other window.
ShopDriverCommunity StarterCommunity StarterNov 19, 2025permalink
I'd want a measurement, not a hunch. Two 2013 Toyota Priuss 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. Not gospel, but it saved me a headache. No warning lights, which is why I'm documenting it.
CamberFanCommunity StarterCommunity StarterNov 19, 2025permalink
If it were in my driveway, loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. If you share a photo of the worksheet, easier to sanity-check. Parking it somewhere I can hear it better next time.
ShopDriverCommunity StarterCommunity StarterNov 19, 2025permalink
Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2013 Toyota Prius does it — then decide on parts. Don't erase codes until someone who can help has seen them. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. Just my two cents from doing this recently. Next check is the cheap one I can do in a driveway.
BatteryScout485Community StarterCommunity StarterNov 19, 2025permalink
OP update: scanned the 2013 Toyota Prius again and still only have the one pending code, no new lights. Not interested in a five-hour wait for a shrug.
CamberFanCommunity StarterCommunity StarterNov 19, 2025permalink
Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2013 Toyota Prius is losing coolant with no puddle. That's the branch I'd chase this week. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. Post the numbers (or the code) and people can get more specific. Only after sitting overnight so far.
CamberFanCommunity StarterCommunity StarterNov 19, 2025permalink
This is usually cheaper to test than to guess. Write temp, speed, and in-gear vs coast when the 2013 Toyota Prius does it — then decide on parts. Don't erase codes until someone who can help has seen them. This is from a 2013 Toyota Prius in Brooklyn. Post the numbers (or the code) and people can get more specific. Make the next action something you can finish this week. If it repeats twice more I'll book time.
BatteryDIYerCommunity StarterCommunity StarterNov 19, 2025permalink
I wouldn't throw parts yet. Move a coil or plug on the 2013 Toyota Prius if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. If this is nothing, great. I want that in data.
TowDadCommunity StarterCommunity StarterNov 19, 2025permalink
If it were in my driveway, write temp, speed, and in-gear vs coast when the 2013 Toyota Prius does it — then decide on parts. Don't erase codes until someone who can help has seen them. I'd want that in writing, not as a promise. I'd sleep better after that step, even if it finds nothing. If it repeats twice more I'll book time.
BatteryScout485Community StarterCommunity StarterNov 19, 2025permalink
Checked the easy stuff on the 2013 Toyota Prius and found one clue worth chasing before I book a shop. I'd rather pay for diagnosis than a second guess-repair.
BatteryDIYerCommunity StarterCommunity StarterNov 19, 2025permalink
I'd want a measurement, not a hunch. Loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Video is ugly but it shows the hesitation.
DieselWrenchCommunity StarterCommunity StarterNov 20, 2025permalink
Asking because it changes the advice: If a shop can't duplicate it on the 2013 Toyota Prius, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. Happy to compare notes if your setup is different. A day of patience here is cheaper than a wrong part. I'd rather pay for diagnosis than a second guess-repair.
CamberTraveler327Community StarterCommunity StarterNov 19, 2025permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2013 Toyota Prius and see if the fault moves. That's the branch I'd chase this week. I'd want that in writing, not as a promise. Make the next action something you can finish this week. Not driving it hard until I know more.
CamberTraveler327Community StarterCommunity StarterNov 19, 2025permalink
Ask what changed right before it started. Loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. I'd want that in writing, not as a promise. Make the next action something you can finish this week. If that fails I'll eat the diagnostic fee.
BatteryScout485Community StarterCommunity StarterNov 19, 2025permalink
OP update: scanned the 2013 Toyota Prius again and still only have the one pending code, no new lights. Cold start is when I can actually reproduce it.
CamberSeller986Community StarterCommunity StarterNov 19, 2025permalink
If it were in my driveway, capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. That's the sequence I'd use. I'd rather look cautious in this thread than stuck later.
GarageSeller43Community StarterCommunity StarterNov 20, 2025permalink
Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. Take it or leave it — that's what I'd do. No warning lights, which is why I'm documenting it.
ApexNomad599Community StarterCommunity StarterNov 20, 2025permalink
Ask what changed right before it started. Get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. Keep sale price, fees, and rate as three different conversations. Wrote this up on my lunch break.
GarageDetailer790Community StarterCommunity StarterNov 20, 2025permalink
Log the conditions before you spend. If a shop can't duplicate it on the 2013 Toyota Prius, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. This is from a 2013 Toyota Prius in Brooklyn. If it doesn't change the out-the-door or the repair estimate, it's noise. Heat soak after errands is the other window.
ShopDriverCommunity StarterCommunity StarterNov 20, 2025permalink
Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2013 Toyota Prius is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. Just my two cents from doing this recently. If that fails I'll eat the diagnostic fee.
BatteryScout485Community StarterCommunity StarterNov 20, 2025permalink
Tried a second charger / second scan and the story on the 2013 Toyota Prius didn't change. Wrote this up on my lunch break.
ApexNomad599Community StarterCommunity StarterNov 20, 2025permalink
Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2013 Toyota Prius does it — then decide on parts. Save the big job until that test fails. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. Write the result down so the next test isn't a repeat of the last one. Happens in gear, not in park, for what that's worth.
TowDadCommunity StarterCommunity StarterNov 20, 2025permalink
Start with the test that can prove you wrong. If a shop can't duplicate it on the 2013 Toyota Prius, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. I'd want that in writing, not as a promise. I refuse to clear codes until someone else sees them.
ShopDriverCommunity StarterCommunity StarterNov 20, 2025permalink
Start with the test that can prove you wrong. Move a coil or plug on the 2013 Toyota Prius if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. Take it or leave it — that's what I'd do. This is the version I'd tell a friend.
GarageSeller43Community StarterCommunity StarterNov 20, 2025permalink
I'd want a measurement, not a hunch. Two 2013 Toyota Priuss can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. This is from a 2013 Toyota Prius in Brooklyn. Just my two cents from doing this recently. I'm keeping receipts and dates in one folder.
CamberPilotCommunity StarterCommunity StarterNov 20, 2025permalink
Same neighborhood, different next step: Get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. Stop there until you know. I'll poke at it this weekend.
GarageDetailer790Community StarterCommunity StarterNov 20, 2025permalink
If it were in my driveway, get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. If it doesn't change the out-the-door or the repair estimate, it's noise. I'd sleep better after that step, even if it finds nothing. I'll poke at it this weekend.
CleanDriverCommunity StarterCommunity StarterNov 20, 2025permalink
This is usually cheaper to test than to guess. Swap the cheap/easy piece first on the 2013 Toyota Prius and see if the fault moves. If the cheap test changes it, stop and reassess. Did the worksheet show tax yet? If it repeats twice more I'll book time.
CamberPilotCommunity StarterCommunity StarterNov 20, 2025permalink
I wouldn't throw parts yet. Capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. That's the whole play. Parking it somewhere I can hear it better next time.
ApexNomad599Community StarterCommunity StarterNov 21, 2025permalink
Not convinced that's the whole story. Swap the cheap/easy piece first on the 2013 Toyota Prius and see if the fault moves. That's the branch I'd chase this week. Time, temperature, and whether it's in gear are the notes that actually help a shop. I'll update if anything new shows up.
CamberFanCommunity StarterCommunity StarterNov 21, 2025permalink
Same neighborhood, different next step: A pressure test beats staring at a dry driveway if the 2013 Toyota Prius is losing coolant with no puddle. That's the branch I'd chase this week. Post the numbers (or the code) and people can get more specific. I'm keeping receipts and dates in one folder.
TowDadCommunity StarterCommunity StarterNov 22, 2025permalink
Not convinced that's the whole story. Capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. I'd want that in writing, not as a promise. Not driving it hard until I know more.
ShopEnthusiast239Community StarterCommunity StarterNov 20, 2025permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2013 Toyota Prius and see if the fault moves. Don't erase codes until someone who can help has seen them. Take it or leave it — that's what I'd do. Parking it somewhere I can hear it better next time.
ShopDriverCommunity StarterCommunity StarterNov 20, 2025permalink
Log the conditions before you spend. Loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. Save the big job until that test fails. On “metallic rattle for a few seconds after,” that was the fork that mattered for me. This is from a 2013 Toyota Prius in Brooklyn. Just my two cents from doing this recently. Not driving it hard until I know more.
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