P151C Code - A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible
Quick Answer
The Hybrid Powertrain control module (HPCM2) monitors the low side refrigerant pressure through the A/C refrigerant pressure sensor. Common causes include Low refrigerant, Faulty Low Side Pressure Sensor, Low Side Pressure Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P151C indicates A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible.
- Common causes
- Common causes include Low refrigerant, Faulty Low Side Pressure Sensor, Low Side Pressure Sensor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P151C Description
To make the P151C Air Conditioning (A/C) Low Side Refrigerant Pressure Sensor Not Plausible DTC evaluation, the HPCM2 compares the A/C Low Side Refrigerant Pressure Sensor reading with the A/C high side refrigerant pressure reading after a dormant soak period.
In addition, to make the P151C Air Conditioning (A/C) Low Side Refrigerant Pressure Sensor Not Plausible DTC evaluation, the HPCM2 also uses the A/C temperature sensor 2 reading.
These two sensors are both in the same environment. The HPCM2 compares the values of these sensors after a dormant soak period. The HPCM2 takes the temperature value and calculates an equivalent pressure for gaseous R134a at that temperature and at the pressure as reported by the Air Conditioning (A/C) Low Side Refrigerant Pressure Sensor and compares these.
DTC P151C sets if both of these comparisons show that the A/C Low Side Refrigerant Pressor Sensor is not in agreement with the other sensors.
To make the DTC P2516 Air Conditioning (A/C) Low Side Refrigerant Pressure Sensor evaluation, the HPCM2 looks for a drop in the pressure value after the compressor has run for a short period after a dormant soak period.
What are the Possible Causes of the DTC P151C?
- Low 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 P151C?
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 P151C 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.
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Information for Specific Makes
- P151C Buick — A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible
- P151C Cadillac — A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible
- P151C Chevrolet — A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible
- P151C GMC — A/C Conditioning Low Side Refrigerant Pressure Sensor Not Plausible
Frequently Asked Questions about P151C Code
1. What are the common symptoms of OBDII code P151C?
- Common symptoms include poor air conditioning performance, irregular cooling, and potential issues with the low side refrigerant pressure sensor.
2. What could cause the OBDII code P151C to trigger?
- The code P151C can be triggered by a faulty low side refrigerant pressure sensor, wiring issues, or problems with the air conditioning system.
3. How can I diagnose the root cause of code P151C?
- Diagnosing code P151C involves checking the low side refrigerant pressure sensor, inspecting related wiring for damage, and ensuring the air conditioning system is functioning properly.
4. Can a DIY enthusiast repair OBDII code P151C?
- Repairing code P151C may require professional diagnostic equipment and expertise due to the complexity of the air conditioning system. It is recommended to consult a qualified mechanic.
5. Are there any quick tips to troubleshoot code P151C before seeking professional help?
- Check the low side refrigerant pressure sensor for visible damage, ensure all wiring connections are secure, and confirm the air conditioning system is properly charged with refrigerant.
6. What are the potential risks of ignoring OBDII code P151C?
- Ignoring code P151C can lead to decreased air conditioning performance, potential damage to the system, and discomfort while driving in hot weather.
7. Can a faulty low side refrigerant pressure sensor be repaired, or does it need to be replaced?
- In most cases, a faulty low side refrigerant pressure sensor will need to be replaced to resolve OBDII code P151C and restore proper air conditioning functionality.
8. How much does it typically cost to fix OBDII code P151C related to the A/C Conditioning Low Side Refrigerant Pressure Sensor?
- The cost of fixing code P151C can vary depending on the root cause of the issue, but it may involve sensor replacement, wiring repairs, and system diagnosis, which could range from $100 to $500 or more.
9. Is it safe to continue driving with OBDII code P151C active?
- While it may be safe to drive with code P151C active, it is not recommended as it can lead to potential air conditioning system issues and discomfort, especially in hot weather.
10. How long does it typically take to repair OBDII code P151C related to the A/C Conditioning Low Side Refrigerant Pressure Sensor?
- The repair time for code P151C can vary depending on the extent of the issue, but it may take a few hours to a day for diagnosis, repair, and testing by a qualified technician.
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