[Diagnose] Q60 feels like limp mode uphill, RPM stuck at 1-1.5k, hard gear knock. No warning lights!
Hey everyone,
I’m dealing with a really baffling issue on my Infiniti Q60 2017 V6 VR30DDTT and could use some advice.
Sometimes when I'm driving up a mountain or steep incline, the car feels like it goes into limp mode, but the dashboard is completely clear no check engine light or warnings at all.
Here are the exact symptoms:
1) No Kick-Down / RPMs Stuck: Even if I completely floor the gas pedal, the RPMs just stay bogged down at 1,000-1,500. Pushing past the kick-down switch does absolutely nothing.
2)Inconsistent Turbo Engagement: Most of the time it stays stuck at low RPM, but occasionally the turbos will finally trigger. When they do, the RPMs shoot up incredibly fast to 4,000–5,000. (I’m assuming it’s the turbos since it’s sudden )
3)Violent Shifting / Gear Knock: On the occasions where the RPMs shoot up to 4k too quickly, the gear knocks/shifts very hard.
I’m completely stumped since there are no codes being thrown on the dash. Could this be an issue with the transmission/valve body struggling under load, or does this sound more like an issue with the turbos/wastegates acting up?
Has anyone experienced this specific combination of symptoms? Any pointers on what I should check or test first would be hugely appreciated. Thanks!