Been reading over the forums...
Just bought this 2012 Crew 4x4 a few days ago. Outside temps when I bought it were warmer (60+) and had no dash lights or codes. Runs great. Driving it home at 70 the DIC showed 21.5 MPG, everything was perfect.
Drove it last night when the temps were under 50 and got an engine light... well $^&#!
Put my phone on it with Torque Pro and got a P0128. Figured it was thermostats. Noticed the coolant was a bit under Min so thought I'd start with the KISS principle and top it off then took it for a test drive and monitor temps. The gauge hits the first tick mark which I figure is the normal operating temp of 185ish and under some full throttle runs it would creep over that mark a touch then come back down instantly... however.. Torque never showed more than 154 under WOT and settled around 143 to 147 under normal driving. There seems to be a disparity there between the dash and Torque.
If it was thermostats I'd expect it to be more consistent, again assuming the gauge is correct..... however, after reading a few threads here it seems GM hasn't perfected an accurate temp gauge and it should be hitting the 210 mark for a true 185ish op temp.
https://www.duramaxforum.com/forum/...ain/123916-210-normal-operating-temp-lml.html
IF that is the case then yeah, I'd say thermostats and the gauge is inaccurate. The attached pic shows where it is on the gauge under normal throttle, etc.
As I'm new to the Duramax and this particular truck anyone care to verify my diagnosis a bit before I start tearing it apart to replace thermostats (and hoses and belts while I'm at it).
Thanks!
Brad
Just bought this 2012 Crew 4x4 a few days ago. Outside temps when I bought it were warmer (60+) and had no dash lights or codes. Runs great. Driving it home at 70 the DIC showed 21.5 MPG, everything was perfect.
Drove it last night when the temps were under 50 and got an engine light... well $^&#!
Put my phone on it with Torque Pro and got a P0128. Figured it was thermostats. Noticed the coolant was a bit under Min so thought I'd start with the KISS principle and top it off then took it for a test drive and monitor temps. The gauge hits the first tick mark which I figure is the normal operating temp of 185ish and under some full throttle runs it would creep over that mark a touch then come back down instantly... however.. Torque never showed more than 154 under WOT and settled around 143 to 147 under normal driving. There seems to be a disparity there between the dash and Torque.
If it was thermostats I'd expect it to be more consistent, again assuming the gauge is correct..... however, after reading a few threads here it seems GM hasn't perfected an accurate temp gauge and it should be hitting the 210 mark for a true 185ish op temp.
https://www.duramaxforum.com/forum/...ain/123916-210-normal-operating-temp-lml.html
IF that is the case then yeah, I'd say thermostats and the gauge is inaccurate. The attached pic shows where it is on the gauge under normal throttle, etc.
As I'm new to the Duramax and this particular truck anyone care to verify my diagnosis a bit before I start tearing it apart to replace thermostats (and hoses and belts while I'm at it).
Thanks!
Brad
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