Notifications
Clear all
2014 Mazda 3 TCM RPM jumps high and Low is this symptom of the TCM failing?
Topic starter
Posted : 09/13/2023 5:25 pm
High/low continuous revving could be rough idle which is ECU/Engine-related. However if it up or downshifts randomly and the revs go unusually high, that could indicate the gears are slipping which is TCM-related. Also, Idle issues can also come from a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
Posted : 09/13/2023 5:27 pm