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2 Posts
Hi
Have a 2012 Traverse LTZ with 108k miles.
Lately it has started going up and down in RPMs by itself when driving, but only when the engine is around 1600-1800 RPM.
At higher RPMs it seems stable and it’s mostly noticeable when driving slow in lower gears but is still noticeable even at highway speed.
If I speed up to > 2000 RPM, the issue goes away.
At the same time it has started to vibrate and kind of stutter when gearing down while going uphill, again when around 1600-1800 RPM and most noticeable when doing slow in low gears. It feels like it’s not sure about when to change gear and kind of messes up the gear change, hence the vibration.
Finally I have seen 3 misfires (P0305 and P0300) and a Vacuum Sensor A/B Correlation (C0561) event.
When these happened it disabled traction control and lit check engine light.
Have already tried disconnecting battery for 5 min. No change.
Have drained and refilled transmission oil. No change.
Thinking about replacing spark plugs, coils and maybe throttle body and eventually TECHM/TCM, but wanted to hear here if anyone have an idea about root cause ?
/Jesper
Have a 2012 Traverse LTZ with 108k miles.
Lately it has started going up and down in RPMs by itself when driving, but only when the engine is around 1600-1800 RPM.
At higher RPMs it seems stable and it’s mostly noticeable when driving slow in lower gears but is still noticeable even at highway speed.
If I speed up to > 2000 RPM, the issue goes away.
At the same time it has started to vibrate and kind of stutter when gearing down while going uphill, again when around 1600-1800 RPM and most noticeable when doing slow in low gears. It feels like it’s not sure about when to change gear and kind of messes up the gear change, hence the vibration.
Finally I have seen 3 misfires (P0305 and P0300) and a Vacuum Sensor A/B Correlation (C0561) event.
When these happened it disabled traction control and lit check engine light.
Have already tried disconnecting battery for 5 min. No change.
Have drained and refilled transmission oil. No change.
Thinking about replacing spark plugs, coils and maybe throttle body and eventually TECHM/TCM, but wanted to hear here if anyone have an idea about root cause ?
/Jesper