P1F0B Code - A/C Compressor Motor Start-Up Current Performance
Quick Answer
The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin, help dehumidify the air in a defrost mode and help maintain the battery temperature. Common causes include Faulty A/C Compressor, A/C Compressor harness is open or shorted, A/C Compressor circuit poor electrical connection. 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
- P1F0B indicates A/C Compressor Motor Start-Up Current Performance.
- Common causes
- Common causes include Faulty A/C Compressor, A/C Compressor harness is open or shorted, A/C Compressor circuit poor electrical connection.
- 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 P1F0B Description
- The customer pushes the AC button
- The HVAC control, in AUTO mode, requests the electric AC compressor on to help in cooling the cabin or removing moisture in the defrost mode
- The High Voltage Battery Thermal System requests the AC compressor on to help maintain the battery temperature
The Hybrid/EV Powertrain Control Module 2 uses values from the A/C refrigerant pressure transducers, A/C refrigerant thermistor, duct temperature sensors, ambient air temperature sensor, passenger compartment temperature sensor, evaporator temperature sensor, battery cell temperature sensors, battery coolant temperature sensors and battery coolant pumps to determine the speed at which the compressor will operate. This message is sent from the Hybrid/EV Powertrain Control Module 2 to the A/C compressor control module via serial data message.
AC Compressor has a motor start up procedure that can take a variable length of time to run to bring the motor up to requested speed. Length of time is dependent on external conditions such as under-bonnet temperature and high side pressure. In hotter conditions, the motor start up time will be longer. The A/C compressor control module monitors an internal parameter known as the DC link current which is based off DC input current. It is not possible to measure this parameter externally.
What are the Possible Causes of the DTC P1F0B?
- Faulty A/C Compressor
- A/C Compressor harness is open or shorted
- A/C Compressor circuit poor electrical connection
How to Fix the DTC P1F0B?
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 P1F0B 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
- P1F0B Buick — A/C Compressor Motor Start-Up Current Performance
- P1F0B Cadillac — A/C Compressor Motor Start-Up Current Performance
- P1F0B Chevrolet — A/C Compressor Motor Start-Up Current Performance
- P1F0B GMC — A/C Compressor Motor Start-Up Current Performance
- P1F0B Saturn — A/C Compressor Motor Start-Up Current Performance
Frequently Asked Questions about P1F0B Code
1. What does the OBDII code P1F0B mean?
Code P1F0B indicates an issue with the A/C compressor motor's start-up current, suggesting that the motor is drawing an abnormal amount of current during startup.
2. What are the common symptoms of the P1F0B code?
Common symptoms include reduced A/C performance, the A/C system not cooling properly, strange noises from the compressor, or the A/C system failing to activate.
3. What causes the P1F0B code to appear?
Possible causes include a faulty A/C compressor motor, electrical issues such as damaged wiring or connectors, a malfunctioning control module, or mechanical issues within the compressor.
4. Can driving with the P1F0B code cause further damage?
Yes, ignoring this code could lead to further damage to the A/C compressor system or electrical components, potentially resulting in higher repair costs.
5. How is the P1F0B code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the A/C compressor motor, check wiring and connectors for damage, and measure the motor's start-up current to identify abnormalities.
6. What are some repairs for the P1F0B code?
Repairs may include replacing the A/C compressor motor, repairing or replacing damaged wiring or connectors, or reprogramming/updating the control module if necessary.
7. Can a low refrigerant level cause the P1F0B code?
Low refrigerant levels usually do not trigger this specific code, as P1F0B relates to the electrical performance of the A/C compressor motor rather than refrigerant levels.
8. Is the P1F0B code specific to certain vehicles?
Yes, P1F0B is typically manufacturer-specific and may apply to hybrid or electric vehicles with electrically driven A/C compressors.
9. How much does it cost to fix the P1F0B code?
Repair costs vary depending on the issue but may range from $200 for wiring repairs to over $1,000 for an A/C compressor motor replacement.
10. Can resetting the code fix the P1F0B issue?
Resetting the code without addressing the underlying issue will not fix the problem, and the code is likely to return. Proper diagnosis and repair are necessary.
Discuss the causes and fixes for P1F0B OBDII Code
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