A/C Refrigerant Temperature Sensor Circuit Range/Performance Problem
The A/C refrigerant temperature sensor is out of the expected range or not performing properly.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The A/C system's temperature sensor is reading a temperature that's either too high or too low for what the system should be seeing, which can prevent the A/C from working properly.
What the computer is actually seeing
The powertrain control module expects the refrigerant temperature sensor to provide a voltage signal between 0.5 to 4.5 volts, corresponding to refrigerant temperatures of -10 to 60 degrees Celsius (14 to 140 degrees Fahrenheit). When it sees a reading outside this range or fluctuating rapidly, it triggers the B1411 code.
What a healthy reading looks like
Refrigerant temperature should read between -10°C to 60°C (14°F to 140°F), with corresponding sensor voltage between 0.5V to 4.5V.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect wiring and connectors for damage or corrosion at the refrigerant temperature sensor and the ECM. Clear the code and see if it returns. Decision: If wiring/connectors are damaged, repair and retest. If not, proceed.
- 2Test the refrigerant temperature sensor using a multimeter. Check for proper voltage output while in A/C mode. Decision: If voltage output is outside 0.5V to 4.5V, sensor needs replacement. If voltage is within range, proceed to next step.
- 3Check the refrigerant charge level in the system. Use the manufacturer's service specs, typically around 1.5 - 2.0 kg (3.3 - 4.4 lbs) for most vehicles. Decision: If refrigerant is low or overcharged, recover and recharge the system. Clear code and retest.
Common causes
- Faulty A/C refrigerant temperature sensor
- Wiring issues between the sensor and the ECU
- Faulty ECM
- Refrigerant overcharge or undercharge
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but A/C may not work properly, and it’s advisable to fix it soon to ensure passenger comfort.
Will this code come back after resetting?
If the underlying issue is not fixed, yes, it will likely return.
Why does it pair with other A/C troubles?
The refrigerant temperature sensor affects the overall operation of the A/C system, so other A/C issues can trigger this code as a symptom.
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