What Does P06A2 Mean?
The PCM has detected that the variable A/C compressor control circuit is reading higher than expected voltage. This typically means the control solenoid circuit is open, has lost its ground path, or has a short to battery voltage. The compressor may default to minimum displacement (little or no cooling) or shut off entirely. The driver will notice reduced or absent A/C cooling.
Common Causes
30%
Open circuit in the A/C compressor control solenoid wiring (broken wire or disconnected plug)
25%
Failed A/C compressor control solenoid with open coil
20%
Corroded or backed-out terminal at the compressor or PCM connector
15%
Short to battery voltage in the control harness from an adjacent power wire
10%
PCM output driver unable to ground the circuit (internal PCM failure)
Diagnostic Steps
1
Measure the A/C compressor control solenoid resistance at the connector; an open-loop (OL/infinite) reading means the solenoid coil is burned open and must be replaced.
2
Check continuity from the PCM control output pin to the compressor solenoid connector; should read near 0 ohms. An open circuit indicates a broken wire.
3
Inspect the compressor connector for backed-out terminals, corrosion, or mechanical damage from engine vibration or belt spray.
4
With the solenoid disconnected, check for unexpected voltage on the control wire; any voltage above battery ground level with the PCM not commanding the solenoid suggests a short to B+.
5
If all external circuits test good, use a scan tool to command the A/C compressor to various duty cycles while monitoring the solenoid connector with an oscilloscope.
Estimated Repair Cost
$100 - $700
Parts + labor, varies by vehicle and location
The PCM has detected that the variable A/C compressor control circuit is reading higher than expected voltage. This typically means the control solenoid circuit is open, has lost its ground path, or has a short to battery voltage. The compressor may default to minimum displacement (little or no cool...
The most common cause of P06A2 (Variable A/C Compressor Control Circuit High) is: Open circuit in the A/C compressor control solenoid wiring (broken wire or disconnected plug)
Typical repair costs for P06A2 range from $100 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive without A/C. The compressor will default to minimum or zero displacement, meaning little or no cooling. This is a comfort issue, not a safety concern, unless driving in extreme heat where passenger safety could be affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06A2 to identify the root cause.
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Quick Info
Category
Powertrain
System
A/C Compressor Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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