P0A43
Hybrid drive motor A position sensor signal cutting in and out
Severity: Inspect soonHybrid and electric drive codes
Hybrids and electric vehicles add a high-voltage traction battery, an inverter that turns its direct current into alternating current for the drive motor, the motor-generators themselves and a DC/DC converter that charges the ordinary 12-volt system. OBD rules require these parts to be monitored, including battery health and state of charge. High-voltage faults are a safety matter: the system carries enough voltage to cause serious electric shock.
How these codes differ
- Battery pack codes (for example P0A80, replace hybrid battery pack, and P0A7F, battery pack deterioration) concern the traction battery's health or the balance between its blocks of cells.
- Isolation codes (for example P0AA6, hybrid battery voltage system isolation fault) mean the computer measured leakage between the high-voltage system and the vehicle body. That is a shock-risk condition and is for a technician trained in high-voltage work only.
- Inverter, motor and cooling codes (for example P0A93, inverter cooling system performance) concern the power electronics and their own cooling loop.
- Many hybrid faults are reported with manufacturer-specific codes or sub-codes, and the same P0Axx code can have several detailed causes on one make. Read them with a scan tool that supports the hybrid control module.
- Codes for the 12-volt system (DC/DC converter, auxiliary battery) can also stop a hybrid from entering ready mode, so a flat 12-volt battery should be ruled out before suspecting the high-voltage side.
Hybrid and electric drive codes
B273C
Digital crash input fault stored in the hybrid control processor (Jeep 4xe)
Severity: Inspect soonP0A78
The inverter that powers hybrid drive motor A is not performing as expected
Severity: Inspect soonP0AA6
The hybrid computer has detected high voltage leaking to the vehicle body
Severity: Inspect soonP0E15
The heater that warms the hybrid battery's coolant is not doing what the hybrid computer commands
Severity: Inspect soonP1E00
Chevrolet Volt: a hybrid control module has stored its own fault codes and is asking the engine computer to turn on the check engine light
Severity: Inspect soonP0A94
The hybrid system has detected a performance fault in the DC/DC converter inside the inverter assembly
Severity: Inspect soonP0A93
Hybrid inverter cooling system performance problem
Severity: Severity not verifiedP0A0A
High-voltage interlock circuit fault: the hybrid system has lost its safety loop
Severity: Inspect soonP0A3F
Drive motor A rotor position sensor circuit fault
Severity: Inspect soonP0A80
Hybrid battery pack flagged for replacement
Severity: Inspect soonP0AC4
Hybrid control module asked the engine computer to turn on the check engine light
Severity: Inspect soonP1A90
On Hyundai and Kia electric cars, a fault in the integrated charging control unit (ICCU), which supplies power to the 12-volt system
Severity: StopP0A1E
Starter/generator control fault (on Ford hybrids, the belt-integrated starter generator)
Severity: MonitorP1A0C
On Ford hybrids, the hybrid powertrain controller disabled the engine (Stop Safely Now message)
Severity: StopP305F
Dual battery control module performance (Chevrolet Malibu eAssist)
Severity: Severity not verifiedP3190
Poor engine power on Toyota and Lexus hybrids
Severity: Inspect soonP0A08
The computer sees an open circuit on the status line from the DC/DC converter
Severity: Inspect soonP0A3E
A hybrid inverter on the generator or alternator side reached its temperature limit
Severity: Inspect soonP0A7A
The generator inverter is not performing as expected, or its fail signal looks wrong
Severity: Inspect soonP0A7F
The hybrid battery pack is worn or one of its modules has deteriorated
Severity: Inspect soonP0AE1
A fault in the hybrid battery precharge contactor circuit; Honda lists it as a bypass contactor fault
Severity: Inspect soonP1437
On Honda hybrids, a short circuit in the motor power inverter module
Severity: Inspect soonP3191
On Toyota hybrids, the engine did not start when the hybrid system asked it to
Severity: Inspect soonP1440
On Honda and Acura hybrids, motor power inverter module output circuit malfunction; on Toyota, secondary air injection control valve circuit, bank 1
Severity: Inspect soonP0A0F
The hybrid computer commanded the gasoline engine to start and the engine did not start
Severity: Inspect soonP0A1F
The battery energy control module, the computer that manages the high-voltage battery, has set an internal fault
Severity: Inspect soonP0A40
The control module sees the position sensor for drive motor A reading out of range or not matching the motor
Severity: Inspect soonP0A7C
The motor control electronics in a hybrid or EV, the inverter or power electronics, have passed their temperature limit
Severity: Inspect soonP0AA1
The hybrid or EV battery computer sees the positive high-voltage contactor still closed when it should be open
Severity: Inspect soonP0AA2
The hybrid or EV battery computer sees the positive high-voltage contactor stuck open, so the battery cannot power the car
Severity: Inspect soonP0B24
The hybrid or EV battery computer sees the voltage of the high-voltage battery jump around when it should be steady
Severity: Inspect soonP1B25
High-voltage battery path fault
Severity: Inspect soonP1B77
High-voltage battery precharging fault
Severity: Inspect soonP1C64
On Ram 1500 eTorque trucks, the hybrid system saw the engine turn slower than its target when stop-start tried to restart it
Severity: Inspect soonP31E7
Restart inhibition fault on Nissan electric vehicles
Severity: Inspect soon
Sources and review
- Final Regulation Order: 13 CCR §1968.2, Malfunction and Diagnostic System Requirements (OBD II), 2004 and subsequent model-year passenger cars, light-duty trucks and medium-duty vehicles (2015 amendments)
- How Do Hybrid Electric Cars Work?
- 49 CFR 571.305, Standard No. 305: Electric-powered vehicles: electrolyte spillage and electrical shock protection
- Diagnostic Trouble Codes Explained: How to Manage DTCs
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error