Error 12

[Stone9]

I have searched and searched on this site and haven't found anyone with this problem. After my sled has gotten cold and I try to start it will sometimes just click once and nothing. I do it again click once and nothing. If i hold the key in the start postition for over 3 seconds I get Error 12. Then I back my truck up and jump the SOB
I have been told it is the Fuel Relay that gets frozen and causes the sled not to start but I wonder what the error 12 means.

 

[Stone9]

Ok i just found that error 12 means CrankShaft Position Sensor. Still don't know how to fix it though

 

[glockwise]

I had a similar problem. Would start fine in the shop and at most quick stops, but if I stayed at a stop too long the relay would freeze up and no start. After a few no starts I started getting engine code 12.

I disconnected the battery to reset the ecm, warmed up the relay and the sled would start. I since have changed out the starter relay and have had no problems.

 

[erosled]

Replace your starter relay. Clean the terminals at the starter relay connector as well. The starting problem and code 12 will go away at the same time.

 

[grizztracks]

code 12 is displayed because when the key is in the crank position the ECU is expecting to see a signal from the crank sensor but because the engine doesn't roll over there is no signal. Check the key switch and relay connectors for corrosion and/or replace the starter relay. I covered my relay with a rubber boot to keep it dry.