P2184 OBD-II Trouble Code: Engine Coolant Temperature Sensor 2 Circuit Low

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2184 code

P2184 is a diagnostic trouble code (DTC) for "Engine Coolant Temperature Sensor 2 Circuit Low". 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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2184 DIAGNOSTIC Get a fair and transparent estimate upfront

P2184 code definition

P2184 is an OBD-II generic code for the engine control module (ECM) detecting the engine coolant temperature sensor (ECT) #2 is indicating low range and does not correlate with ECT sensor #1.

What causes the P2184 code?

  • The engine control module (ECM) checks the ECT and ambient temperature sensors when the engine is first started cold to see if the sensors correlate with each other and with the ambient air temperature sensor.

  • The ECT sensor is not reading within a specified range and is too low when compared to the other sensors.

  • The ECT sensor is too low and is not correlating to the #1 ECT sensor reading and the ambient temperature sensor.

What are the symptoms of the P2184 code?

  • The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.

  • The ECM will ignore the ECT #2 sensor and will retest it each time the engine has a cold start to verify the failure is still active or not.

  • The engine should run normally as long as the #1 sensor is not having a problem and correlates to the ambient air temperature sensor.

  • The only symptom will be the Check Engine Light not being on as long as only one sensor is failing.

How does a mechanic diagnose the P2184 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for failure

  • Scans the engine only after the engine has been sitting for at least 8 hours and the coolant is at ambient temperature

  • Scans the ECM and checks readings from the two ECT sensors and the ambient air temperature sensor to see if the ECT #2 sensor is reading a lower temperature than the other two sensors. All three should be within a few degrees of each other

  • Checks the #2 ECT sensor connector for problems like loose or corroded pins

  • Replaces the #2 ECT sensor if all wiring checks out okay and the Ohm's test shows that it is out of specifications

Common mistakes when diagnosing the P2184 code

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed so the ECM will be able to monitor the system like normal again

  • Failing to identify and repair any connector issues before replacing the ECT sensor

How serious is the P2184 code?

  • Code P2184 is a code indicating the number 2 ECT sensor does not match the #1 sensor, and if this sensor fails, then the engine will have running issues. This will fail the vehicle for emissions testing and cause the engine to run too rich during the failure.

What repairs can fix the P2184 code?

Additional comments for consideration regarding the P2184 code

Code P2184 is for the second ECT sensor. The engine has two sensors to back up each other in case of a failure to keep the engine running smoothly. This is so that one failure does not cause any running issues with the engine except for turning on the Check Engine Light.

Failure to fix the problem will keep the Check Engine Light on, and if another fault happens, you would not be alerted to an issue since the Check Engine Light would already be on. In addition, this failure will cause your vehicle to not pass your emission testing in most states and would need to be repaired before retaking the test.

Need help with a P2184 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.

Check Engine Light
trouble codes
P2184

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2184 code.

SCHEDULE P2184 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


Related questions

Engine fan non-stop running until you turn the ignition key off

A P2184 code indicates temp sensor circuit low. That means the voltage that the ECU reads on the temp sensor is low. The ECU interprets this as a hot engine and turns on the fan. A short circuit in the...

More related articles

P0745 OBD-II Trouble Code: Pressure Control Solenoid Malfunction
What What the P0745 code means When the code P0745 appears in your powertrain control module (PCM), it means that the PCM is not reading the correct electrical voltage drops from the Pressure Control Solenoid as it does its job....
P0219 OBD-II Trouble Code: Engine Overspeed Condition
P0219 trouble code definition Engine overspeed condition What the P0219 code means The P0219 code means that the revolutions per minute of...
P2441 OBD-II Trouble Code: Secondary Air Injection System Switching Valve Stuck Closed Bank 1
P2441 P2441 code definition Secondary Air Injection System Switching Valve Stuck Closed Bank 1 What the P2441 code means P2441 is an OBD-II code for the engine control module (ECM) detecting no exhaust pulse while monitoring the exhaust pressure sensor...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com