A/C Control Circuit Low Input
The A/C control module detects a low signal voltage in the control circuit.
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What it means (plain English)
The A/C control module is looking for a certain voltage level in the system; if it sees a voltage lower than about 0.5 volts when it should be higher, it triggers this code.
What the computer is actually seeing
The computer is expecting a voltage signal between 0.5 to 4.5 volts from the A/C control signal. If it fluctuates or drops below 0.5 volts, the code is set.
What a healthy reading looks like
Signal voltage should be between 0.5 to 4.5 volts while the A/C is on.
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 wiring and connector to the A/C control module for any visible damage or corrosion. Decision: Is the wiring intact? If yes, proceed to step 2; if no, repair or replace damaged wiring.
- 22. Inspect the appropriate fuses related to the A/C system. Decision: Is the fuse intact? If yes, proceed to step 3; if no, replace the blown fuse and retest.
- 33. Measure the voltage at the A/C control module connector with the A/C turned on. Decision: Is the voltage between 0.5 to 4.5 volts? If yes, the module is likely faulty; replace the A/C control module. If no, there’s an issue with the wiring or power supply circuit, investigate further.
Common causes
- Damaged wiring in the A/C control circuit
- Faulty A/C control module
- Poor connection at the A/C control module or associated connectors
- Blown fuse in the A/C control circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the A/C may not work properly until it's fixed.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why is this code paired with A/C problems?
This code indicates a problem in the control signal, which directly affects A/C operation.
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