An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.


The air flow coming into the engine is accumulated and used to determine if the engine has been driven within conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally, or does not reach the regulating temperature of the thermostat, the diagnostics that use ECT as enabling criteria may not run when expected.


This DTC will only run once per ignition cycle within the enabling condition. If the PCM detects the calibrated amount of air flow and engine run time have been met, and the ECT has not met the minimum thermostat regulating temperature, DTC P0128 sets.


The most common cause for this is just a faulty thermostat. Or, low coolant level.


More Auto Repair Help


Be Social With Us !

Leave your comments

Post comment as a guest

0
    • No comments yet.

    Latest Articles

    2003 Mercuruy Sable Shuts Off ...

    2003 Mercury Sable. 24v V-6. Question: Hi, recently had ...

    Jeep Grand Cherokee ...

    Question: 2002 grand Cherokee jeep. Wrong key put in tried ...

    A/C Compressor Will Not ...

    1992 Chevy 3500. When i turn on the a/c the compressor does ...

    SES Code P0446 Evap and ...

    2000 Chev Blazer 4wd 4.3 engine GM Computer code P0446.In ...

    How Things Work

    Anti Lock Brakes -What Does The ABS Light Mean

    When wheel slip is detected during a brake application, the ABS enters antilock mode. During antilock braking, hydraulic pressure in each wheel hydraulic circuit is controlled to prevent a wheel from slipping. A separate hydraulic line and specific solenoid valves are used for each wheel. The ABS can decrease, hold, or increase hydraulic brake pressure to each wheel.

    Read more...

    Common Engine Codes

    P0108 MAP Sensor Description and Repair

    The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:

    Read more...