Variable A/C Compressor Control Circuit Low
The P06A1 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit of the variable displacement A/C compressor. This circuit typically operates at a specific voltage range to modulate compressor output. A low voltage reading suggests a short to ground, open circuit, or a failing compressor control solenoid. This can prevent the A/C system from engaging or operating efficiently.
01. Most Common Causes
- Faulty A/C compressor control solenoid
- Open or shorted wiring in the control circuit
- Poor electrical connection at the compressor or PCM
- Failed PCM (rare)
02. Symptoms You Will Notice
- A/C system inoperative or blows warm air
- Intermittent A/C operation
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the A/C compressor connector and wiring for damage or corrosion.
Step 3: Test the control circuit voltage at the compressor connector with a multimeter (should be near battery voltage with A/C on).
Step 4: Check resistance of the compressor control solenoid (typically 5-20 ohms).
Step 5: If circuit and solenoid are okay, test PCM output and consider PCM replacement if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the A/C may not work properly. Driving without A/C is safe, but if the issue causes a short, it could drain the battery or affect other systems.
How much does it cost to fix?▼
Repair costs vary from $150 to $400, depending on the cause. A solenoid replacement is cheaper, while PCM replacement is more expensive.