What Does P1548 Mean?
The PCM has detected a malfunction in the A/C compressor clutch output circuit. The circuit is not responding as expected when the PCM commands the clutch to engage or disengage.
Common Causes
35%
Failed A/C compressor clutch relay
25%
Open or high resistance in clutch coil wiring
20%
Failed A/C compressor clutch coil
15%
Blown fuse or poor power supply connection
5%
PCM internal output driver failure
Diagnostic Steps
1
Step 1: Check A/C clutch fuse and relay operation
2
Step 2: Test for battery voltage at A/C clutch when commanded on by scan tool
3
Step 3: Measure A/C clutch coil resistance for open circuit
4
Step 4: Check continuity in wiring between relay and compressor clutch
5
Step 5: Monitor PCM output signal to relay with scan tool during operation
Estimated Repair Cost
$80 - $550
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the A/C compressor clutch output circuit. The circuit is not responding as expected when the PCM commands the clutch to engage or disengage.
The most common cause of P1548 (A/C Compressor Clutch Output Circuit Malfunction) is: Failed A/C compressor clutch relay
Typical repair costs for P1548 range from $80 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concern. A/C system will not operate, affecting passenger comfort only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1548 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air Conditioning System
Difficulty
Type
Manufacturer
Recommended Tools
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