AutoCodes – Generic – P2516

P2516 Code - A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance

Quick Answer

The Powertrain Control Module (PCM) monitors the refrigerant pressure through the Air Condition (A/C) Pressure Sensor. Common causes include Low refrigerant, Too much refrigerant, Faulty Low Side Pressure Sensor. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P2516 indicates A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance.
Common causes: Common causes include Low refrigerant, Too much refrigerant, Faulty Low Side Pressure Sensor.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,774

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2516 Description

The Powertrain Control Module (PCM) monitors the refrigerant pressure through the Air Condition (A/C) Pressure Sensor. The PCM supplies a 5V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure causes the sensor signal to the PCM to vary. When the pressure is high, the signal is high. When the pressure is low, the signal is low. The PCM sets the OBII code when the signal from the sensor is out of factory specifications.

OBDII Code P2516 - A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance - AutoCodes.com — P2516 Code - A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P2516?

Low refrigerant
Too much refrigerant
Faulty Low Side Pressure Sensor
Low Side Pressure Sensor harness is open or shorted
Low Side Pressure Sensor circuit poor electrical connection

How to Fix the DTC P2516?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2516 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2516 code?

Need more information on how to fix the P2516 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2516 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2516 Chevrolet — A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance
P2516 Dodge — A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance
P2516 Ford — A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance
P2516 GMC — A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance
P2516 Mercedes-Benz — A/C Refrigerant Pressure Sensor 'B' Circuit Range/Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2516 Code

1. What are the common symptoms of OBDII code P2516?

- Common symptoms include the air conditioning system not cooling properly, erratic A/C compressor operation, and the A/C system not engaging at all.

2. What can cause OBDII code P2516 to trigger?

- The code P2516 is often triggered by a faulty A/C refrigerant pressure sensor 'B', wiring issues, low refrigerant level, or a malfunctioning A/C compressor.

3. How can I diagnose the cause of OBDII code P2516?

- Diagnosis typically involves checking the A/C refrigerant pressure sensor 'B' and its wiring for damage or corrosion, testing the A/C system for proper refrigerant level, and inspecting the A/C compressor for any issues.

4. Can I continue driving with OBDII code P2516 present?

- It is not recommended to continue driving with code P2516 as it can lead to further damage to the A/C system and potentially cause discomfort while driving in hot weather.

5. How is OBDII code P2516 typically repaired?

- Repairing OBDII code P2516 often involves replacing the faulty A/C refrigerant pressure sensor 'B', repairing any damaged wiring, ensuring the A/C system has the correct refrigerant level, and addressing any compressor issues.

6. Are there any DIY tips for troubleshooting OBDII code P2516?

- DIY tips may include visually inspecting the sensor and its wiring for any obvious damage, checking the A/C system refrigerant level using a gauge, and ensuring the A/C compressor is engaging properly.

7. Can a low refrigerant level cause OBDII code P2516?

- Yes, a low refrigerant level in the A/C system can cause the A/C refrigerant pressure sensor 'B' to trigger code P2516 due to incorrect pressure readings.

8. How important is it to address OBDII code P2516 promptly?

- It is important to address code P2516 promptly to ensure proper functioning of the A/C system, prevent potential damage to other components, and maintain comfort while driving in hot conditions.

9. Is it necessary to reset the OBDII system after repairing code P2516?

- Yes, it is recommended to reset the OBDII system after repairing code P2516 to clear the error code and ensure the system is operating correctly.

10. What are the long-term effects of ignoring OBDII code P2516?

- Ignoring code P2516 can lead to further A/C system malfunctions, reduced cooling efficiency, increased wear on the A/C compressor, and potential costly repairs in the future.