Question about 2000 Chevrolet Silverado 1500

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Fuse for tach

Where is the fuse for the tach and what;s it called. Tach doesn't work, transmission will not shift properly( starts off in 3rd gear) Check engine light on.

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THERE IS A 10 AMP IGNITION 1 FUSE UNDER THE HOOD IN THE PDC.THERE IS NOT A FUSE FOR THE TACH.IF THAT FUSE WAS BLOW NONE OF THE GAUGES WOULD WORK.U COULD USE A SCAN TOOL AND CK FOR TROULE CODES.

Posted on Apr 29, 2009

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1 Answer

TRANSMISSION


Fuse # 20 or 21 gets power through ignition. This fuse controls PRNDL indicator, speedometer, tach, & will cause transmission to not shift gears correctly. Ours took off in 3rd gear when put in Overdrive & only ran in 3rd gear. If we tried to manually shift thru gears (auto trans), it had 1st, 3rd, reverse. No 2nd or over drive. Replaced ignition. Fixed problem. Root problem was Electric motor that engaged 4 wheel low side was bad. Every time we used 4 Low side it threw power surge through ignition & blew ignition out. Good Luck.

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Check transmission fuse its the one labeled PRNDL or similar.Use a test light when you check it by the way.If the fuse is good then its probaly your ignition switch failed.If that fuse is bad or the ignition switch is not suppling power to that fuse your tack,speedo,and gear indicator wont work, and your transmission will go into a safe mode.Safe mode is just the transmission staying in 3rd gear all the time until you fix this.

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1 Answer

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Yes it can be what it is doing is called hunting, As for your RPM tach it has nothing to do with it, Now your transmission is a 4L60 and YES it does need a tach signal or the RPM signal it doesnt matter if your Tach gauge doest work but it need the tach signal for the transmission to work. And NO there is NO VSS it needs TACH. or it will hunt for a shift that is why its doing this.Youll need to restor the TACH to the transmission so it can shift properly, Now youll either have a 4pin connection,1 wire or youll have a 4 pin 2 wire connection or youll have a 4 pin 3 wire connection This transmission need tach signal so bear with me i am going to some how draw it pretend your looking at the switch. connection

l-------------------------------L
I A B I
I C D I Okay the C is TACH that has to work

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Had same problem with my 2000 dodge stratus 2.4 liter and transmission would not shift out of 1st gear. Solution was ignition fuse under the hood was blown, one side of fuse working, replaced 10 am fuse everything works, tach, speedometer, gas gauge and transmission started back to shifting.

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The next place you need to go to in this vehicle is a transmission repair facility, attached to a tow-truck. They will confirm/eliminate the transmission as the problem. There are other things it could be, but it's telling you "transmission" and you need to have that confirmed/eliminated first, because it is almost always the most destructive and expensive fault a vehicle can develop. Don't drive it again, because it's cheaper to repair a transmission that has not grenaded.

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I would say its your Ignition switch or the fuse for tranny is blown or the tranny is unplugged.My truck had a problem where it was stuck in third gear, the tach never moved,the gear indicator light went out.I left it at the tranny shop all day and nobody could find the problem.All you need to do is check your fuses with a test light.I looked at all my fuses and they were all good but when I used a test I found that some fuses didnt have power supplied to them from the ignition switch.Your fuses need power on both sides to complete that circiut.So I would say go get a test light because they are cheap and check your fuses before you go right back to the parts store for that ignition switch.Good Luck

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