What Does P2516 Mean?
The PCM has detected an implausible or erratic signal from the A/C refrigerant pressure sensor B circuit. The sensor reading doesn't correlate with expected operating conditions or with sensor A readings.
Common Causes
45%
Faulty A/C refrigerant pressure sensor B
25%
Wiring harness damage or corrosion in sensor circuit
15%
Intermittent electrical connection at sensor connector
10%
Refrigerant system contamination affecting sensor accuracy
5%
PCM internal fault
Diagnostic Steps
1
Step 1: Visually inspect A/C pressure sensor B and connector for damage, corrosion, or loose connections
2
Step 2: Monitor live data for sensor B voltage/pressure readings and compare to sensor A during A/C operation
3
Step 3: Check sensor signal voltage at PCM connector and sensor connector with multimeter (typically 0.5-4.5V range)
4
Step 4: Test sensor resistance and compare to specifications if available
5
Step 5: Verify A/C system pressures with mechanical gauge to confirm actual refrigerant pressure matches sensor readings
Estimated Repair Cost
$150 - $400
Parts + labor, varies by vehicle and location
The PCM has detected an implausible or erratic signal from the A/C refrigerant pressure sensor B circuit. The sensor reading doesn't correlate with expected operating conditions or with sensor A readings.
The most common cause of P2516 (A/C Refrigerant Pressure Sensor "B" Circuit Range/Performance) is: Faulty A/C refrigerant pressure sensor B
Typical repair costs for P2516 range from $150 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not a safety concern. A/C system may not operate efficiently or may be disabled by PCM to protect compressor.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2516 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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