2023 GMC Sierra 1500 — brake fluid is old but still looks clean

This is usually cheaper to test than to guess. Loaded-suspension checks on the 2023 GMC Sierra 1500 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Time, temperature, and whether it's in gear are the notes that actually help a shop. I'd rather look cautious in this thread than stuck later.

Start with the test that can prove you wrong. Capture voltage while the 2023 GMC Sierra 1500 is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. This is from a 2023 GMC Sierra 1500 in Orlando with 36,500 miles. Keep sale price, fees, and rate as three different conversations. I've seen both outcomes, which is why I'd test instead of assume. I'd rather pay for diagnosis than a second guess-repair.

Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2023 GMC Sierra 1500 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. On “brake fluid is old but still looks,” that was the fork that mattered for me. Do that first. This is me being the wet blanket on purpose.

If it were in my driveway, swap the cheap/easy piece first on the 2023 GMC Sierra 1500 and see if the fault moves. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. Not interested in a five-hour wait for a shrug.

Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 2023 GMC Sierra 1500 is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. Happens in gear, not in park, for what that's worth.

Ask what changed right before it started. A pressure test beats staring at a dry driveway if the 2023 GMC Sierra 1500 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. 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. I'm in no rush to be a hero on it.

If it were in my driveway, get a real battery/charging test on the 2023 GMC Sierra 1500, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. This is from a 2023 GMC Sierra 1500 in Orlando with 36,500 miles. If they can't show the line item, I assume it's hiding. Not trying to scare you — just skip the expensive first guess. Only after sitting overnight so far.

If it were in my driveway, write temp, speed, and in-gear vs coast when the 2023 GMC Sierra 1500 does it — then decide on parts. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. I'd sleep better after that step, even if it finds nothing. I'd rather pay for diagnosis than a second guess-repair.

OP update: scanned the 2023 GMC Sierra 1500 again and still only have the one pending code, no new lights. I'll poke at it this weekend.

Ask what changed right before it started. Swap the cheap/easy piece first on the 2023 GMC Sierra 1500 and see if the fault moves. If the cheap test changes it, stop and reassess. This is from a 2023 GMC Sierra 1500 in Orlando with 36,500 miles. Write the result down so the next test isn't a repeat of the last one. I already checked the easy fluid levels.

Ask what changed right before it started. Loaded-suspension checks on the 2023 GMC Sierra 1500 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. I'd rather look cautious in this thread than stuck later.

OP update: scanned the 2023 GMC Sierra 1500 again and still only have the one pending code, no new lights. I already checked the easy fluid levels.

I'd want a measurement, not a hunch. Capture voltage while the 2023 GMC Sierra 1500 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. Stop there until you know. Not trying to scare you — just skip the expensive first guess. I'll update if anything new shows up.

I'd want a measurement, not a hunch. If a shop can't duplicate it on the 2023 GMC Sierra 1500, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. This is from a 2023 GMC Sierra 1500 in Orlando with 36,500 miles. Stop there until you know. This is the version I'd tell a friend.