Question about 1999 Nissan Sentra

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Speedometer goes to 0 and trans downshifts

Just driving and the trans will downshift and when you look down the speedo is on 0. when the speedo resumes working the trans will shift back to the higher gear. Replaced speedo sensor to no avaial.

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There are 2 speed sensors on the transaxle. One is for vehicle speed and one is for trans output shaft speed. My guess is that you replaced the one for output shaft speed.

Nissan Scope Technician- 10 years with Nissan

Posted on Oct 29, 2008

  • Nico Jul 26, 2013

    Have not replaced any 1 of the 2,kilometers not counting and show no speed on speedo



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you did not ask a question, why is that? just a code.
which trans, regular or CVT? there are 3 transmissions. and m/t
the Trans chapter shows 7 trans. and 4wd options.???
VIN code A,C or G? (tranny code is in VIN)????
p2 is a factory only code.
Downshift Switch Circuit Low are asking how to do all the FSM steps. to diagnose this.?
you reset it and it came back
are there driving symptoms??????????

the set is.
P2779 Downshift Switch Circuit Range/Performance
P2780 Downshift Switch Circuit Low
P2781 Downshift Switch Circuit High
P2782 Downshift Switch Circuit Intermittent/Erratic

the key to understanding the cause is to understand the test.
how is the test done, (monitors) and what does it actually measure.
a real fsm will tell you if the LOW means, voltage at solenoid is low.
or RPM was too low.
and is key to the cause.
i dont have the real FSM, and online shows nothing.

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Do I have to pull the tranny to fix it,or is there a cover I can take off to get to it.How much is the part?

You dont want to start buying 250 dollar parts , that you dont know you need.You need to hook a scan tool to this thing and see if the downshift is even being comanded. When you come to a stop the scan should have 0 output rpms and should say the trans is in low gear.If you have say 14 rpms showing on the output speed sensor at a stop the the computer will think the vehicle is still moving and not allow for a downshift.This trans does not have govenor solenoid and sensor like the earlier jeeps did.Its electronic controls are more like the mini vans with the 604 trans. I have seen mini vans have a downshift bump and / or no downshift because the plugs wires were too close to the wiring harness and creating a falseoutput speed signal. It will pay to have this Transmission diagnosed by someone with knowledge and the tools.

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Speedometer going up and down. Car downshifts while driving normal

most cars including yours, you have a speed snesor on the gearbox, which tells the computer (ecu) and transmission how fast you are going....the fact that you have included that the speedo is erratic, is telling me that the sensor needs to be replaced, as it is telling the ecu (which tells the speedo) the incorrect signal as well as the transmission......hopefully, easy fix

this reminds me that cars are like humans IN A WAY, the same symptoms may lead to a cause, the car not downshifting and the erratic speedo are the symtoms, just like a runny nose and cough are symptoms, and the sensor is the cause of the faults, where the cold is the cause of the faults in cool

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