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sierra wont start, checked everything!

yukon25008.1

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yukon25008.1 Senior Enthusiast

yukon25008.1

Posted
Posted

i finished all the work to the truck previosly posted in the raylar thread, the truck ran decent for less then a week. I parked it on a sun. Mon nothing. Battery is putting out voltage. All the relays and fuses are good. I got a new ignition switch today.put it in and nothing, if anyone could help id be very appriciatve. I called the dealer just to run it by them and the guy said sometimes the gauge cluster will go and cause the isues im having.

What else or what next,

yamahas Enthusiast

yamahas

Posted
Posted

Will it turn over at all? What do you hear when you turn the key?

yukon25008.1 Senior Enthusiast

yukon25008.1

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Hit the key and nothing at all.. No sound ethier. Nothing

but if using a jumper under the hood you could feed 12volts to the purple starter wire and the starter would crank. But no fire up. Somethings not telling the fuel pump,starter,or spark to work.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Check the battery cables, both negative and positive leads. Make sure all battery connections are tight and clean. Do nut just grab them and wiggle, take them off at both ends, and clean all connections.

Not sure if cars and trucks have a single circuit breaker or big ass fuse like motorcycles do, so, try locate that item if it actually does have it.

 

When you jumped the purple wire, was the key in the run position? If it is not, then it will not run after jumping it.

yukon25008.1 Senior Enthusiast

yukon25008.1

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I cleaned them like new! It was in the run position,. Nothing... No fuel. No spark

yukon25008.1 Senior Enthusiast

yukon25008.1

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Got a po802 out of the truck today,.. think its a tranny control.....

Still no start, but now when you hit the ket the fuel pump comes on...

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

Here is what I found.

 

DTC P0802 (model years 03-05) (Transmission Control Module - Incorrect Voltage Level on MIL Request Circuit) stored in the ECM. This condition will usually occur during engine start up. This is when the ECM and TCM do not communicate properly on the initial "hand shake" during power up. One module may be powering down during crank due to a low voltage situation.

 

Check the vehicle for a possible weak or a dead battery in dual battery applications. Also check for possible poor connections, poor grounds, UBEC connections, or possibly an ignition switch dropping out during crank

yukon25008.1 Senior Enthusiast

yukon25008.1

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I double checked connections.. still stumped, an the ignition swicth is new

 

The pic isnt changed,, 05 sierra 8.1/allison

newdude Senior Enthusiast

newdude

Posted
Posted

Battery may be putting voltage but is it in good condition? Have you had it tested for state of charge/health? Bad ground somewhere?

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