The Pentium b70 instrument sometimes jumps by itself, and the gearbox does not upshift.

1, the throttle cable or throttle position sensor is not adjusted properly. Check and adjust the throttle cable and throttle position sensor to eliminate the fault.

2. If the vehicle speed sensor fails, check the vehicle speed sensor and replace it.

3. If the shift valve is stuck or the gear switch fails, check the gear switch signal. If there is no fault in the control system, remove the automatic transmission. These are the reasons why the Pentium b70 instrument sometimes jumps near the gearbox without upshifting.