What is the P0A93 fault codes? What is the description of the Inverter “A” Cooling System Performance failure? How do you fix the P0A93 fault code What are the causes and symptoms of the P0A93 ?….fault code?
What is the P0A93 fault code? What does it all mean?
P0A93 fault code means “Inverter “A” Cooling System Performance”. This fault code is valid for hybrid vehicles equipped with OBD-II after 1996. Fault code P0A93 will be set if the powertrain control module, PCM detects any problem in the inverter cooling systems.
Inverters are used in hybrid and electric vehicles to convert DC (Direct current) electrical energy from the HV(High Voltage) battery packs into three-phase AC, Alternating Current electrical energy for the motor/generator. The internal temperature of inverters is controlled and maintained by a PCM-controlled cooling unit. This cooling system is composed of a water pump and other special components, such as temperature sensors, coolant level gauges, thermostats, and hoses. However, the cooling system for inverters might share a section with dedicated cooling fans.
Due to the different materials used in its construction the coolant used by the inverter assembly differs from other cooling systems. The coolant has a short service life. Failure to follow the service procedures could cause acidification. Fluid leakage can result from system corrosion.
The safety and efficiency of hybrid and electric vehicles will depend on the operation of the inverter system. The PCM continually monitors the operating conditions and parameters of the inverter coolant system. These include, but not limited to: the minimum/maximum coolant temperatures, the coolant level and current draw as well the speed of both the coolant pump and coolant fan. If any parameter is detected to exceed a threshold or predetermined level, the PCM will set fault code P0A93.
* Some hybrid vehicles have a second inverter, usually labeled “B”, used to maintain the charge in the 12V battery that powers the headlights, air conditioning compressor and some other accessories.
P0A93 fault codes can be applied to vehicles of all makes and models, including but not limited to Toyota, Lexus or Volkswagen.
What Causes the P0A93 Fault code?
Some issues can cause code P0A93. For a precise diagnosis, make sure you thoroughly inspect all cooling system components. The following are possible causes of the P0A93 error code:
- – The leakage of the hybrid cooling system is due to corrosion of coolant hoses, gaskets
- Low coolant levels
- – Unsuitable coolant
- – A defective high-voltage coolant pump motor or pump
- – Inverter system overheating
- – Damaged or burnt wires and/or connections in the control circuits and feedback circuits of coolant system
- – Temperature sensors for coolant temperatures that are defective
- Motor cooling fan motor is defective
- – The PCM is malfunctioning or requires a new software update (rarely).
What are the symptoms for the P0A93 fault code?
These symptoms may be present if you own a vehicle that has the P0A93 code.
- – Illumination at the check engine lights
- – Lighting of related fault lights
- Depending on the cause, coolant leaks could occur.
- High-voltage systems can overheat
- Depending on what the problem is, the PCM could shut down the vehicle to prevent further damage.
- In some cases, other fault codes may be assigned
How do I fix the P0A93 fault code?
The following repairs may be able to resolve the P0A93 fault code:
- – Removal of the coolant that is not required
- – Removing unsuitable cooling agent
- Repair of damaged cables or connectors to the circuit of the inverter cooler system circuit
- – Repair or replacement for the inverter cooling unit
- Troubleshooting the coolant pump or motor
- – Replacing the inoperative fan motor
- – Replacing the defective coolant temperature sensor
