P0A91 OBD-II: Drive Motor "B" Performance
P0A91 Severity
Should you fix P0A91 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0A91?
Toyota's Hybrid System uses two "Motor Generators" (MG1 and MG 2) to converter high voltage to mechanical energy (movement). The two MG units are used to start the gasoline powered engine and act as the transmission. If the High Voltage control module detects an issue with MG1 or MG2, it will store code P0A91.
Need a P0A91 diagnosis? Trust our experts.
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OBD II Fault Code
- OBD II P0A91
OBD-II Code Engine may not start is defined as a Drive Motor "B" Performance
Toyota's Hybrid System uses two "Motor Generators" (MG1 and MG 2) to converter high voltage to mechanical energy (movement). The two MG units are used to start the gasoline powered engine and act as the transmission. If the High Voltage control module detects an issue with MG1 or MG2, it will store code P0A91.
Engine may not start Symptoms
- Engine may not start
- Vehicle may be immovable
Common Problems That Trigger the P0A91 Code
- Hybrid vehicle generator failure
- Inverter/converter assembly failure
Ask our experts about P0A91.
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