What Does P2517 Mean?
The PCM has detected a voltage signal from A/C refrigerant pressure sensor B that is below the acceptable threshold. This indicates either very low system pressure or an electrical circuit fault.
Common Causes
35%
Short to ground in sensor signal wire
30%
Failed A/C refrigerant pressure sensor B reading low
20%
Damaged or corroded sensor connector causing poor ground
10%
A/C system refrigerant leak causing actual low pressure
5%
Open circuit in sensor 5V reference supply
Diagnostic Steps
1
Step 1: Inspect sensor connector and wiring for visible damage, moisture, or corrosion
2
Step 2: Disconnect sensor and measure voltage at PCM side of harness connector (should see 5V reference on signal wire)
3
Step 3: Check for short to ground in signal wire between sensor and PCM with ohmmeter (engine off, sensor disconnected)
4
Step 4: Measure sensor output voltage with sensor connected and compare to specifications
5
Step 5: Test A/C system static and operating pressures with mechanical gauge to verify actual refrigerant charge level
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a voltage signal from A/C refrigerant pressure sensor B that is below the acceptable threshold. This indicates either very low system pressure or an electrical circuit fault.
The most common cause of P2517 (A/C Refrigerant Pressure Sensor "B" Circuit Low) is: Short to ground in sensor signal wire
Typical repair costs for P2517 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety risk to operation. A/C compressor may be disabled to prevent damage from low refrigerant.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2517 to identify the root cause.
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Quick Info
Category
Powertrain
System
A/C System and Engine Controls
Difficulty
Type
Generic (SAE)
Recommended Tools
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