B0288 code meaning
HVAC A/C Pressure Sensor Circuit
What B0288 means
A search found B0288 in no J2012 list and in no carmaker's service data; it stays unconfirmed. The refrigerant pressure sensor it names sits on the high-pressure line; its signal decides whether the compressor may run and how fast the cooling fan turns. On most cars the engine controller reads it and stores P0530–P0533. Saab's 9-3 with Trionic 8, for example, sets P0532 below 0.25 V and P0533 above 4.2 V, each for over 1 s with the engine running above −7 °C, and then cuts the A/C relay. Patent US9259992B2 routes the sensor to the engine module in the same way, and US5623835A uses it to drive the fan. A body code would only be used where the climate module reads the sensor itself.
B0288 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0288
- Air conditioning blows warm because the compressor is disabled
- Radiator fan runs constantly or at the wrong speed
Common causes of B0288
- Most likelyRefrigerant pressure sensor failed or signal drifting
- PossibleSensor connector near the condenser corroded by road spray
- Possible5 V reference, ground or signal wire open or shorted
- Less likelyVery low refrigerant charge giving an implausible reading
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac refrigerant pressure sensorAc compressor relayHvac control module
What each part of B0288 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 88 | The exact fault in that area. |
What to do next
- Note B0288 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B0288
What does B0288 mean?
B0288 means "HVAC A/C Pressure Sensor Circuit". A search found B0288 in no J2012 list and in no carmaker's service data; it stays unconfirmed. It is a generic code, so it means the same on every make.
Is it safe to drive with B0288?
B0288 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0288 fail an emissions test?
B0288 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B0288 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0288 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.