OBD-II Code · Sensors
P0119
ECT Sensor Intermittent
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$75–$200
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
ECT intermittent.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- CEL on and off
- Erratic gauge
Likely causes
- Loose connectorMost common
- Chafed wire
Read the full diagnostic procedureP0119 sets when the ECT signal jumps or drops out erratically rather than failing cleanly high or low.
P0119 sets when the ECT signal jumps or drops out erratically rather than failing cleanly high or low.
Cheapest-first and almost always correct on this code
- wiggle-test.
- With the engine warmed up and the scan tool graphing ECT live, grab the connector and tug each wire while watching for a glitch.
- A clean sensor shows a smooth descending curve from cold start; an intermittent ECT shows spikes or sudden drops to -40 F or +250 F lasting a fraction of a second.
- Backprobe the signal wire and flex the harness from the sensor back toward the PCM. Healthy reference points: roughly 2.5 to 3.0 V at 70 F (about 2-3 kohm), 0.5 to 1.0 V at 200 F (about 150-250 ohm), and a continuous smooth curve between them on a warm-up graph.
- Caveat: thermal expansion of a marginal solder joint at the PCM connector or a splice pack can make this fault appear only after 20 minutes of driving; a 5-minute test in the bay will miss it.
Vehicle-specific patterns1999-2007 GM 4.8/5.3/6.0 LS trucks are the textbook case: the under-intake engine harness corrodes at the splice pack and the ECT signal drops out in…
- 1999-2007GM 4.8/5.3/6.0 LS trucks are the textbook case: the under-intake engine harness corrodes at the splice pack and the ECT signal drops out intermittently.
- 2003-2010Dodge Ram 5.7 Hemi sees pushed-back terminal pins in the ECT connector that lose contact on rough roads.
- 2004-2010Ford F-150 5.4L 3V has chafing on the ECT lead where it routes past the intake.
- 2002-2008Honda Pilot/Odyssey J35 has TSB for an intermittent ECT connector seal failure that admits moisture.
Estimated repair$40 to $350.
Look up another code
P0119 — frequently asked
What does a P0119 code mean?
ECT intermittent.
What causes a P0119 code?
Common causes: Loose connector; Chafed wire.
What are the symptoms of a P0119 code?
Typical symptoms: CEL on and off; Erratic gauge.
Is it safe to drive with a P0119 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $75-$200.
How do I diagnose a P0119 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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