P0128 cummins

Getting P code. Thread Tools. Received 21 Likes on 19 Posts. Last few days its been VERY cold.

Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. I changed the thermostat, then the temp sensor.

P0128 cummins

Forgot your password? By MoparMan. This diagnostic looks at the how cold the system is at start up, what the inlet air temperature is, and the amount of fuel burned during that drive cycle. The PCM estimates what the coolant temperature should be. If the coolant temperature is not above a calibrated threshold, the rationality fails. The PCM assumes that the thermostat is stuck open. The coolant temperature does not rise above a calibrated amount over a calibrated amount of time. Turn the ignition off. With the engine cold, verify the level of coolant in the cooling system. Is the cooling system full of coolant? Start the engine. With the scan tool, monitor the coolant temperature for 10 minutes.

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P0128 cummins

Forgot your password? By MoparMan. This diagnostic looks at the how cold the system is at start up, what the inlet air temperature is, and the amount of fuel burned during that drive cycle. The PCM estimates what the coolant temperature should be. If the coolant temperature is not above a calibrated threshold, the rationality fails. The PCM assumes that the thermostat is stuck open. The coolant temperature does not rise above a calibrated amount over a calibrated amount of time. Turn the ignition off.

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Find More Posts by BigIron P Thermostat Rationality. The ECM is not seeing the temps rise in a set time and trippin the code. Deals Forum. She be cold up here eh. Looking at how the computer "sees changes" I suspect there isn't anything wrong. Insert Quotes Quotes Post Reply. Suggestions on what I should check, or just ignore it? Max Tune Replies. Advanced search.

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Depending upon the results of the comparison, a pass, fail, or inconclusive condition is determined. Most Helpful Newest. I deleted my code and the check engine light hasn't come on again so i can't imagine it's serious. With the engine cold, verify the level of coolant in the cooling system. All forum threads, articles, etc. Should be the end of that code then Forums What's new Log in Register Search. Come join the discussion about reviews, drivetrain swaps, turbos, modifications, classifieds, builds, troubleshooting, maintenance, and more! Battery cables. Log in Register. Tip Jar If MoparMan. Click to expand Please consider creating a new thread. This is an older thread, you may not receive a response, and could be reviving an old thread. I'll wait for next summer, when I'm running the AC a lot to see if it comes back.