Air Conditioning System Sensor Circuit Range/Performance Problem
The A/C system has detected a malfunction in a sensor's performance.
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 car's A/C has a problem with one of its sensors that affects how it cools the cabin.
What the computer is actually seeing
The HVAC control module monitors inputs from temperature sensors and pressure sensors in the A/C system. If the readings are outside normal ranges (e.g., temperature sensor reads above 140°F when it should be between 30°F and 60°F), a fault code is set.
What a healthy reading looks like
Expected voltage for A/C temp sensors is typically 0.5V to 4.5V depending on temperature; pressure sensors should show between 25 to 45 psi in normal operating conditions.
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.
- 1Check A/C refrigerant level. It should be in the range of 25-45 psi; if low, add refrigerant and retest.
- 2Inspect wire harness and connectors to the A/C temperature and pressure sensors for damage or corrosion. Repair if necessary.
- 3Test the A/C temperature sensor with a multimeter. At room temp, it should read around 2.5V; if it reads out of range, replace the sensor.
- 4Check the A/C pressure sensor. It should read correctly based on the current A/C pressure; replace if readings are erratic.
Common causes
- Faulty A/C temperature sensor
- Incorrect A/C refrigerant level
- Bad electrical connection or wiring
- Faulty A/C pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it is generally safe to drive, but A/C performance may be compromised.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code sometimes pair with other faults?
Multiple sensors can fail simultaneously or one issue can cause false readings in another sensor.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →