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P0119 is a diagnostic trouble code (DTC) for "ECT Sensor Circuit Intermittent Malfunction Problem". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Engine Coolant Temperature (ECT) sensor circuit intermittent malfunction problem.
P0119 is the generic OBD-II code which indicates that the Engine Control Module (ECM) has detected intermittent ECT sensor input.
The ECT sensor input to the ECM is erratic; not giving a steady, stable reading.
The ECM turns on the Check Engine Light and goes into failsafe mode, substituting input to 176 deg F.
The engine may have a hard start when the engine is cold, and will start normal when warm.
The engine may run rough and hesitate until the engine warms up.
The engine should run close to normal once the engine warms up.
Since the ECT input is intermittent, the ECM may go in and out of failsafe mode, causing the engine to run erratically.
Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.
Visually checks to see if coolant is full, and that the system and thermostat are working correctly
Scans and documents the codes that are received and views the freeze frame data to see when the code was set
Clears the OBD-II fault codes and retests the vehicle to see if the code comes back
Observes the sensor’s live data on the scanner to ensure that the temperature output is within specifications while wiggling the sensor connector and wiring
If no problems are noted, then the next step for the technician is to disconnect and check the sensor and connector for problems like corrosion or loose connections. Corroded sensors and connectors should be replaced.
Not performing a visual inspection regularly
Not following the manufacturer's pinpoint test procedure step-by-step or skipping steps
Not replacing an ECT sensor when tests indicate a problem
Not trying to connect and view the ECM data to see if the temperature output from the sensor is as expected before installation of the new ECT sensor
The ECM may go in and out of failsafe mode since the problem is intermittent.
The problem may progress to a more permanent or serious failure if problem is not repaired.
Intermittent failure may be shorted wiring that could damage the ECM or wiring.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.