bad VSS (chevy)
k1500 not Suburan. 4th gear dead.
NOT TOLD ALL 4wd or 2wd truck, and matters huge on VSS.
5.0L? no car mileage told or on tranny..
the scan tool tells you VSS is dead.,veh.speed,sensor.
the transmission shifts by lots of variables and FOR SURE SPEED, is one, so the would't cause is dead wrong;.
first thing to do is learn what box is there. (real name)
GM car is GM transmissions sure but which exact one.
and why do you ignore the speedo/tacho, they must work.
chevy 1999 k1500 4L60E RPO Codes M30
4L60e electrically shifted by the TCM brain (it or PCM/TCM)_
to shift electronically many things most work
VSS, and all speed sensors, and shift solenoids.
and more this code smacks of cam timing errors top me.
Trouble Code:
P1345 (5.0L V8 VIN M Auto)
Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation( < this word means OUT OF TIME in geek speak) the PCM predicts next cam pulse and is way the heck off time, and tells you it is and does not lie.
OMG it has an old Distributor and CMP is bad or distributor ws never timed correctly as the SM directs.
SM= service manual.
this error can not be ignored, but back to transmission problem in drive
To shift up the TCM brain must know speed
in drive upshifts fail, hard.
I am reading your SM now. learning what version this 4L60 is
and all sensors and if it has line pressure control solenoid.
to get the VSS DTC error one must drive long time to get it.
but the speedo did not lie to you , VSS is dead.
yes it has PCsol PCS solenoid that sets main tranny line pressure just before the shift, ( 3 soles to shift , not 2)
as you go higher gears the main line pressure needed to do so needs lots more pressure
from 75PSI to 175 PSI in drive. if not gears fail.
now 2 photo to prove all this.
first is VSS then 2nd is PCsol.
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