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Service bulletin A25-028

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11020579
Published by NHTSA2025-07-09
Manufacturer's numberA25-028
Manufacturer's date2025-07-03
NHTSA componentVISIBILITY/WIPER

NHTSA's summary

Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently. Possible DTC codes P0530 (Air Conditioning Refrigerant Pressure Sensor Circuit) and P0534 (Air Conditioning Refrigerant Charge Low) may be set.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Glass, wipers and mirrors, Wipers and washers

Trouble codes named

P0530, P0534

Vehicles listed
HONDA PROLOGUE2024

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
A25-0282026-03-24. Service bulletin. Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently due to possible faulty air conditioner condenser check valve or improperly formed A/C line at the mating surface of the condenser check valve.
A25-0282026-03-16. Service bulletin. Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently.
A25-0282026-03-03. Service bulletin. Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently. Possible DTC codes P0530 (Air Conditioning Refrigerant Pressure Sensor Circuit) and P0534 (Air Conditioning Refrigerant Charge Low) may be set.
A25-0812025-10-14. Service bulletin. Service Bulletin - Vehicle-Wide Programming (VWP), also known as SPS3-VWP, is a feature within Techline Connect (TLC) to update all applicable control module software at the same time. When initiated, all applicable updates are done in parallel, instead of the conventional individual control module update. Customers may have complaints or concerns that may get resolved by doing this software update.
A25-0282025-07-02. Service bulletin. Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on) due to a potential faulty air conditioner condenser check valve or improperly formed A/C line at the mating surface of the condenser check valve.
A25-0282025-04-03. Service bulletin. Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently. Possible DTC codes P0530 (Air Conditioning Refrigerant Pressure Sensor Circuit) and P0534 (Air Conditioning Refrigerant Charge Low) may be set.
A25-0262025-03-19. Service bulletin. Service Bulletin - Due to software issue, customers may experience intermittent loss of heating or cooling in the cabin and may display a "Service High Voltage" message and DTC B2BAA.