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Need advice: Rivian 12V warning: drive to service or request mobile help?

TowCommuter12Community StarterAug 6, 20262023 Rivian R1T Quad-MotorNew Jersey
Got a 12V-related service warning and the truck otherwise wakes and drives normally. For people who've dealt with low-voltage issues, did you risk driving to service or treat it like a potential bricking issue? I'm in New Jersey. Any data points from owners would help.
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44 replies

TowCommuter12Community StarterCommunity StarterAug 7, 2026permalink
I went back under the 2023 Rivian R1T and it only happens after a heat soak, not on a cold start. Video is ugly but it shows the hesitation.
RoadDetailer19Community StarterCommunity StarterAug 7, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. Parking it somewhere I can hear it better next time.
FlatSixDriver66Community StarterCommunity StarterAug 7, 2026permalink
Yes, with one caveat: On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Did the worksheet show tax yet? If your situation is the opposite, ignore me. That's my plan before I call anyone.
EVMiles31Community StarterCommunity StarterAug 7, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in New Jersey. Take it or leave it — that's what I'd do. Not interested in a five-hour wait for a shrug.
WrenchScout82Community StarterCommunity StarterAug 7, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. That's where I'd start. When does it actually happen? Make the next action something you can finish this week. No warning lights, which is why I'm documenting it.
TowCommuter12Community StarterCommunity StarterAug 7, 2026permalink
Tried a second charger / second scan and the story on the 2023 Rivian R1T didn't change. I keep a notes app thread for this now.
MileageDailyCommunity StarterCommunity StarterAug 7, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. Then you'll know the next fork. Run the total, not the monthly, before you commit. I've seen both outcomes, which is why I'd test instead of assume. Video is ugly but it shows the hesitation.
RoadDetailer19Community StarterCommunity StarterAug 7, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. This is from a 2023 Rivian R1T in New Jersey. Keep sale price, fees, and rate as three different conversations. I'd rather pay for diagnosis than a second guess-repair.
EVMiles31Community StarterCommunity StarterAug 7, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Not gospel, but it saved me a headache. Checking again after work.
MileageDailyCommunity StarterCommunity StarterAug 7, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in New Jersey. If it doesn't change the out-the-door or the repair estimate, it's noise. Video is ugly but it shows the hesitation.
WrenchScout82Community StarterCommunity StarterAug 7, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. Then you'll know the next fork. This is from a 2023 Rivian R1T in New Jersey. Have you gotten a second quote in writing? I've seen both outcomes, which is why I'd test instead of assume. No warning lights, which is why I'm documenting it.
FlatSixDriver66Community StarterCommunity StarterAug 7, 2026permalink
Quick add on that: Leave the alerts on the 2023 Rivian R1T so service can see what you saw. Then you'll know the next fork. Did the worksheet show tax yet? Checking again after work.
MileageDailyCommunity StarterCommunity StarterAug 7, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. Cold start is when I can actually reproduce it.
WrenchScout82Community StarterCommunity StarterAug 7, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. Have you gotten a second quote in writing? I already checked the easy fluid levels.
WrenchScout82Community StarterCommunity StarterAug 7, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. Then you'll know the next fork. Any freeze-frame data saved? I keep a notes app thread for this now.
TowCommuter12Community StarterCommunity StarterAug 7, 2026permalink
Tried a second charger / second scan and the story on the 2023 Rivian R1T didn't change. If the story changes I'll post the new data.
MileageCommuterCommunity StarterCommunity StarterAug 7, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. That's the whole play. I'd sleep better after that step, even if it finds nothing. I already checked the easy fluid levels.
FlatSixDriver66Community StarterCommunity StarterAug 7, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. Was this after sitting overnight? I'm keeping receipts and dates in one folder.
TowCommuter12Community StarterCommunity StarterAug 7, 2026permalink
It did rivian 12v warning: drive to service or twice this week, both times after sitting. No change in mileage feel. Not driving it hard until I know more.
SmoothMechanicish18Community StarterCommunity StarterAug 8, 2026permalink
Same neighborhood, different next step: On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Post the numbers (or the code) and people can get more specific. This is the filter I use when the thread starts repeating itself. Not interested in a five-hour wait for a shrug.
CruiseMom36Community StarterCommunity StarterAug 9, 2026permalink
Yes, with one caveat: On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in New Jersey. Just my two cents from doing this recently. I'd rather look cautious in this thread than stuck later.
CruiseMom36Community StarterCommunity StarterAug 8, 2026permalink
Fair point. Counterpoint: Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. Then you'll know the next fork. Not gospel, but it saved me a headache. That's coming from doing this as an owner, not a shop. I'd rather pay for diagnosis than a second guess-repair.
EVMiles31Community StarterCommunity StarterAug 7, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. Not gospel, but it saved me a headache. I refuse to clear codes until someone else sees them.
EVMiles31Community StarterCommunity StarterAug 8, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Not gospel, but it saved me a headache. This is the version I'd tell a friend.
MileageDailyCommunity StarterCommunity StarterAug 8, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. Run the total, not the monthly, before you commit. Wrote this up on my lunch break.
SmoothMechanicish18Community StarterCommunity StarterAug 8, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. This is from a 2023 Rivian R1T in New Jersey. Happy to compare notes if your setup is different. I keep a notes app thread for this now.
FlatSixDriver66Community StarterCommunity StarterAug 9, 2026permalink
I'd push back a little: Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. I'd do that before spending real money. Did the worksheet show tax yet? Make the next action something you can finish this week. If this is nothing, great. I want that in data.
MileageDailyCommunity StarterCommunity StarterAug 9, 2026permalink
Quick add on that: Leave the alerts on the 2023 Rivian R1T so service can see what you saw. Then you'll know the next fork. 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'd rather look cautious in this thread than stuck later.
TowCommuter12Community StarterCommunity StarterAug 8, 2026permalink
I went back under the 2023 Rivian R1T and it only happens after a heat soak, not on a cold start. I'd rather pay for diagnosis than a second guess-repair.
MileageDailyCommunity StarterCommunity StarterAug 8, 2026permalink
Agree — and I'd add this: Leave the alerts on the 2023 Rivian R1T so service can see what you saw. I'd do that before spending real money. I'd want a dollar figure or a measured spec, not 'should be fine.' Not trying to scare you — just skip the expensive first guess. I refuse to clear codes until someone else sees them.
MileageCommuterCommunity StarterCommunity StarterAug 9, 2026permalink
Yes, with one caveat: Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. That's the whole play. No warning lights, which is why I'm documenting it.
TireDriverCommunity StarterCommunity StarterAug 8, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2023 Rivian R1T, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “rivian 12v warning: drive to service or,” that was the fork that mattered for me. Learned this the expensive way on a previous car. Parking it somewhere I can hear it better next time.
MileageDailyCommunity StarterCommunity StarterAug 8, 2026permalink
Not convinced that's the whole story. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. Then you'll know the next fork. This is from a 2023 Rivian R1T in New Jersey. I'd want a dollar figure or a measured spec, not 'should be fine.' If the story changes I'll post the new data.
FlatSixDriver66Community StarterCommunity StarterAug 8, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Any freeze-frame data saved? Not driving it hard until I know more.
WrenchScout82Community StarterCommunity StarterAug 8, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. Did the worksheet show tax yet? I refuse to clear codes until someone else sees them.
TireDriverCommunity StarterCommunity StarterAug 8, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. A shop burned me once by skipping that step. That's my plan before I call anyone.
TowCommuter12Community StarterCommunity StarterAug 8, 2026permalink
Cleared nothing. I want service to see the alert on the 2023 Rivian R1T first. I'd rather look cautious in this thread than stuck later.
MileageDailyCommunity StarterCommunity StarterAug 8, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. That's where I'd start. If it doesn't change the out-the-door or the repair estimate, it's noise. Video is ugly but it shows the hesitation.
WrenchScout82Community StarterCommunity StarterAug 9, 2026permalink
I hear you, though I'd still want a second check. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. This is from a 2023 Rivian R1T in New Jersey. Did the worksheet show tax yet? Happens in gear, not in park, for what that's worth.
FlatSixDriver66Community StarterCommunity StarterAug 8, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2023 Rivian R1T so service can see what you saw. That's where I'd start. Have you gotten a second quote in writing? I'd sleep better after that step, even if it finds nothing. Cold start is when I can actually reproduce it.
MileageDailyCommunity StarterCommunity StarterAug 8, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. That's where I'd start. I'd want a dollar figure or a measured spec, not 'should be fine.' Video is ugly but it shows the hesitation.
FlatSixDriver66Community StarterCommunity StarterAug 8, 2026permalink
Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2023 Rivian R1T — site sharing and pack temp change the curve a lot. I'd do that before spending real money. This is from a 2023 Rivian R1T in New Jersey. When does it actually happen? I've seen both outcomes, which is why I'd test instead of assume. Trying not to diagnose from the couch.
TowCommuter12Community StarterCommunity StarterAug 8, 2026permalink
It did rivian 12v warning: drive to service or twice this week, both times after sitting. No change in mileage feel. Might be overthinking it, but I'd rather overthink than overspend.
TireDriverCommunity StarterCommunity StarterAug 8, 2026permalink
Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2023 Rivian R1T charge sessions. I'd do that before spending real money. This is from a 2023 Rivian R1T in New Jersey. Had a similar mess a couple years ago and that's what finally sorted it. Make the next action something you can finish this week. Cold start is when I can actually reproduce it.
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