Air Conditioning Relay Control Circuit Low
Indicates a problem with the air conditioning relay control circuit.
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 air conditioning system is not getting the signal it needs to turn on because of a circuit issue, likely related to the relay that controls the AC compressor.
What the computer is actually seeing
The computer checks the voltage at the AC relay control circuit and expects to see around 12 volts when the AC is requested. If it sees less than 8 volts, it throws the code B1444.
What a healthy reading looks like
Expected voltage on the control circuit is between 11-14 volts when the AC is activated.
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.
- 11. Check the battery voltage to ensure it's above 12.4 volts. Replace or recharge if necessary.
- 22. Inspect the AC relay for any signs of damage or corrosion, replace if needed.
- 33. Using a multimeter, measure voltage at the relay control circuit. It should read 11-14 volts when the AC is activated. If it's low, proceed to the next step.
- 44. Inspect wiring and connectors from the relay to the control module for damage or corrosion. Repair any issues found.
- 55. Test the AC control switch for proper operation. If it does not operate correctly, it may not be sending the proper signal to the relay.
Common causes
- Faulty AC relay
- Corroded or damaged wiring
- Bad connection at the relay or control module
- Weak battery or poor ground connection
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you won’t have air conditioning, and the system may not work properly.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does this code pair with related codes?
Related codes often indicate similar problems within the AC system, typically involving the same relay or circuit.
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 →