Skip the auto shop - Our mechanics make house calls

P0119 OBD-II Trouble Code: ECT Sensor Circuit Intermittent Malfunction Problem

check engine light logo

P0119 code definition

Engine Coolant Temperature (ECT) sensor circuit intermittent malfunction problem.

What the P0119 code means

P0119 is the generic OBD-II code which indicates that the Engine Control Module (ECM) has detected intermittent ECT sensor input.

What causes the P0119 code?

The ECT sensor input to the ECM is erratic; not giving a steady, stable reading.

What are the symptoms of the P0119 code?

  • 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.

How does a mechanic diagnose the P0119 code?

  • 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.

Common mistakes when diagnosing the P0119 code

  • 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

How serious is the P0119 code?

  • 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.

What repairs can fix the P0119 code?

Additional comments for consideration regarding the P0119 code

  • The P0119 code is often associated with P0115, P0116, P0117 and P0118 codes.
  • Most failures for code P0119 include a harness shorting, or a connector corrosion issue.

Need help with a P0119 code?

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: 2009 Ford Escape has a code P0400 even after EGR valve replacement

If your test results for KD5 and KD7 are accurate, there is a short between the PCM and EGR stepper motor. Your readings indicate both a short to ground and power, so my guess is that the four wires inside...

Q: 1999 firebird every now and then dies while driving and low engine power light comes on

A bad mass airflow (MAF) sensor can cause loss of power, no starts, and lean or rich conditions. If cleaning the sensor did not get rid of the P0102 trouble code, then replace the MAF sensor and clear the...

Q: Whenever I drive 1.5 miles, the s3 light starts blinking and then when I stop my car and come back to it, the car won't start.

Hello, thank you for writing in. It is difficult to determine the issue without some more information. To start, when the check engine light illuminates, you want to scan the vehicle for diagnostic codes. These are what set the check...