Q: OBD message "insufficient coolant temp for closed loop"

asked by on

I replaced sensor with 2 leads but still get message, replaced thermostat but still get message. I'm wondering if the sensor with 1 wire ( for dash gauge??) being faulty would generate the same message ? Gauge is reading on dash but could it still be messing up the ecu ? car seems to run and idle fine!!!!

My car has 135000 miles.
My car has an automatic transmission.

It appears that your vehicle uses two separate sensors. One would be for the temperature gauge on the dash, while the other one is used for the signal to the control module. The sensor for the control module should be a two wire sensor, appears to mount on the back side of the intake manifold/block. I’m sure you have already checked it, but I would also like to point out that you need to be sure that the coolant is full, or the incorrect reading will be supplied to the control module, even if the sensor is working properly. If you feel you could use some help in identifying and/or repairing the problem, contact a certified mechanic, like the mobile mechanics available at YourMechanic.com.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. OBD message "insufficient coolant temp for closed loop"

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Door lock problems

Hi there. There is a resistor for the door locks that keep a voltage on the driver door lock cylinder to activate the secondary door locks electronically. If the resistor is leaking (losing power) it tends to cause the door...

Q: two front wheel speed sensor died

As long as the light is out and does not come back on, then the system is working as it should. The problem with the sensors may be an intermittent problem in the sensors or the wires going to the...

Q: Damage to car after hitting curb.

Its likely that something is bent and should be checked on an alignment rack by a certified mechanic. Another likely possibility would be a plastic splash guard that came loose in the incident. Have this problem inspected and diagnosed for...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.