Today it is cool out and my 2000 3500 is going almost to red on accel. And the quadzilla reads fine till 204 then reads -40. Anyone else have this issue?

 

Yes, lots of people. The above should solve it. As far the temp reading on the Quad, it is my understanding it only reads to 204* then reverts to the -40 you are seeing. I believe that is a quirk with the Quad.

Thank you for the reply. That link is helpful. But I have already modded the crankcase vent. I did figure out the issue. I was 1.5 gallons low of coolant. No leaks but haven't added in 2 years. Thanks again. I love this site. So I have donated to both the site fund and mikes medical bills. You guys all rock and my truck would not be as bulletproof without your time and efforts.  

ECM CANBus can't report higher than 204*F and then flips to -40*F which is normal. ECM CANBus is limited to 00 to FF in Hex. Which in decimal displayed is -40*F to +204*F span if you add zero there you have 255.

 

You need an app called Simply Auto for your phone so as you track the fuel mileage it reminds you to service different things.

 

Edited April 6, 20196 yr by Mopar1973Man