Error Trouble Codes

Code C1259 is reported by the ABS module when it detects a regenerative-braking or high-voltage system malfunction. It commonly appears with a hybrid battery fault but is not directly caused by the hybrid battery. Diagnose any hybrid battery code first. If C1259 remains afterward, test the 12-volt battery; if the code still remains, professional diagnosis is required.

Code C1310 is reported by the ABS module when it receives a malfunction signal from the high-voltage system. It commonly appears with a hybrid battery fault but is not directly caused by the hybrid battery. Diagnose any hybrid battery code first. If C1310 remains afterward, test the 12-volt battery; if the code still remains, professional diagnosis is required.

Code P0171 indicates that the engine is receiving too little fuel or too much air on Bank 1. Common causes include a vacuum leak, dirty or faulty mass airflow sensor, or low fuel pressure. The engine may run normally, run poorly, or stall depending on the cause. This code is not related to the hybrid battery. This is a primary code and can lead to hybrid battery failure.

Code P0172 indicates that the engine is receiving too much fuel or too little air on Bank 1. Possible causes include a dirty or faulty mass airflow sensor, fuel-pressure issue, or another air-fuel control problem. The engine may run normally, run poorly, or stall depending on the cause. This code is not related to the hybrid battery.

This code indicates that all hybrid battery voltage-sensing circuits are reporting an open circuit or battery-block voltage below 2.5 volts. The issue is usually in the connections between the battery blocks and the hybrid battery ECU or voltage sensor rather than in the individual battery modules.

Code P0420 indicates that the catalytic converter is not operating efficiently. Possible causes include a worn catalytic converter, faulty oxygen sensor, exhaust leak, or another engine-related condition. The vehicle may remain drivable initially, but delaying repairs can allow contaminants to build up and restrict the converter, which may eventually cause poor engine performance or stalling.

Code P0517 indicates a high-voltage reading from the 12-volt battery temperature-sensor circuit. If it appears immediately after a 12-volt battery replacement, the sensor or its connection may not have been reinstalled correctly. If it appears later, the sensor, wiring, or related components should be professionally diagnosed.

This code indicates a problem with the DC/DC converter, which converts high-voltage power from the inverter into power for the 12-volt electrical system. When the converter is not operating correctly, the 12-volt battery may lose charge. On most hybrid vehicles, the converter is part of the inverter. On certain 2007–2011 Toyota Camry and Nissan Altima, 2006–2011 Lexus GS 450h, and 2009–2012 Lexus HS 250h models, it is part of the hybrid battery assembly.

Code P0A78 indicates that the high-voltage control module has detected a performance issue with the inverter assembly. The inverter converts direct current from the hybrid battery into three-phase alternating current to power the electric motor and transaxle. This code is not caused by the hybrid battery and requires professional diagnosis.

Code P0A7A indicates a performance issue involving the generator motor or inverter assembly. The inverter converts direct current from the hybrid battery into three-phase alternating current for the hybrid motor and transaxle. Professional diagnosis is recommended to identify the affected component.

Code P0A7F indicates deterioration of the hybrid battery pack. On Toyota hybrids, the hybrid battery is the cause in approximately 95% of cases. On Honda vehicles, the code may also involve the transmission, A/C compressor, or other components. The vehicle may remain drivable, but any no-start condition or additional codes should be diagnosed separately.

Code P0A80 indicates that one or more hybrid battery blocks differ in voltage by more than 1 volt, usually because a battery module is failing. The hybrid battery is the cause in approximately 90–95% of cases. On some 2010 and newer vehicles with a recently replaced hybrid battery, the hybrid powertrain control module or a loose negative connection at the 12-volt battery may also contribute. The vehicle may remain drivable, often in reduced-power (limp) mode. P0A80 is a primary code, but engine no-start codes such as P0A0F and inverter codes take priority because power flows from the engine through the inverter to the hybrid battery. An engine that repeatedly fails to start can place added strain on and potentially damage the hybrid battery. An inverter failure typically prevents the vehicle from starting or transferring power and only rarely damages the hybrid battery.

Code P0A93 indicates a performance problem in the inverter cooling system. It is not caused by the hybrid battery. The vehicle may remain drivable, but inadequate inverter cooling can disrupt normal charging and discharging and place additional stress on the hybrid battery. Prompt professional diagnosis is recommended.

Code P0A94 indicates that the inverter/converter assembly is not producing the expected power. In many cases, the vehicle will not start. If the vehicle does operate, continued driving may place additional stress on the hybrid battery. Professional diagnosis is recommended as soon as possible.

This code indicates a problem with a hybrid battery temperature-sensor circuit. Hybrid batteries typically use three to six sensors to monitor cell temperature. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

This code indicates a problem with a hybrid battery temperature-sensor circuit. Hybrid batteries typically use three to six sensors to monitor cell temperature. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

This code indicates a problem with a hybrid battery temperature-sensor circuit. Hybrid batteries typically use three to six sensors to monitor cell temperature. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

This code indicates a problem with a hybrid battery temperature-sensor circuit. Hybrid batteries typically use three to six sensors to monitor cell temperature. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

Code P0AA6 indicates an electrical isolation fault between the vehicle’s high-voltage system and the low-voltage system or vehicle body. Depending on the vehicle, it may prevent the car from starting or shifting into Drive or Reverse. Possible sources include the hybrid battery, inverter, air-conditioning compressor, transmission, or ABS servo motor. Toyota subset codes help identify the likely source: 526 is general code emaning hybrid system and not indicative of a component or system, 611 points to the inverter or A/C compressor, 612 confirms the hybrid battery, 613 points to the transmission or inverter, and 614 may involve the transmission, inverter, or hybrid battery. Because this fault can involve several high-voltage components, diagnosis by a Toyota dealer or a Hybrid specialist repair shop is recommended. A weak 12-volt battery does not directly cause P0AA6, but electrical interference may cause a stored code to become active after a recent battery replacement.

This code indicates a problem with a hybrid battery air-temperature sensor circuit. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

On applicable GM hybrid vehicles, code P0AB9 indicates that the hybrid control system commanded the engine to start, but the engine failed to run. This is a primary engine-performance code and is not caused by the hybrid battery. Engine, fuel-delivery, throttle-body, mass-airflow, and related systems should be diagnosed first.

This code indicates a fault in the hybrid battery pack current-sensor circuit. Possible causes include an internal relay, fuse, wire, or connector. In approximately 99% of cases, the issue is within the hybrid battery. This is a primary code and should be addressed before related secondary codes.

This code indicates a fault in the hybrid battery current-sensor circuit. The issue is commonly associated with the voltage sensor, battery ECU, internal electronics, or the connection to the vehicle wiring harness. The hybrid battery is the cause in approximately 90% of cases. This is a primary code and should be addressed before related secondary codes.

On GM hybrid vehicles, code P0AC4 means the hybrid powertrain control module has requested that the malfunction indicator light turn on. It does not identify a specific hybrid battery failure. Any other P, C, U, or B codes should be diagnosed first because they may identify the primary issue. If P0AC4 is the only code present, check the 12-volt battery, fluid levels, door and hood switches, ABS and airbag systems, wiring, fuses, and the hybrid powertrain control module. Dealer-level diagnosis is recommended if no other code or cause is found. For Nissan Altima hybrid vehicles, it is an issue in the hybrid powertrain and includes the hybrid battery, the transmisison, and the inverter.

This code indicates a problem with a hybrid battery air-temperature sensor circuit. Possible causes include a failed temperature sensor, wiring fault, powertrain control module, or an internal hybrid battery issue. The hybrid battery is the cause in approximately 90% of cases.

This code indicates a fault in the hybrid battery current-sensor circuit. The issue is commonly associated with the voltage sensor, battery ECU, internal electronics, or the connection to the vehicle wiring harness. The hybrid battery is the cause in approximately 90% of cases. This is a primary code and should be addressed before related secondary codes.

This code indicates a problem with the relays that control the high-voltage system. The issue is often located inside the hybrid battery, but it may also involve the hybrid controller, relay circuits, or other under-hood components. Further diagnosis may be required if replacing the hybrid battery does not resolve the code. It is a primary code.

This code indicates a fault in the hybrid high-voltage interlock circuit. Hybrid vehicles typically have interlocks at the hybrid battery, transmission, and inverter. The vehicle may not start if an interlock is installed incorrectly, has failed, or has a damaged mating connection. Professional diagnosis is recommended to identify the affected interlock.

Code P0A0F indicates that the hybrid control system commanded the engine to start, but the engine failed to run. The 12-volt battery and hybrid system must be operating well enough for the start command to occur. This is a primary engine-performance code and is not caused by the hybrid battery. Engine, fuel-delivery, throttle-body, mass-airflow, and related systems should be diagnosed first.

This code indicates that a hybrid battery voltage-sensing circuit has detected an open circuit or a battery-block voltage below 2.5 volts. The likely cause is the hybrid battery ECU, voltage sensor, related connections, or the hybrid battery itself. If the hybrid battery was recently replaced, confirm that the 12-volt battery is fully charged and tests properly; a weak 12-volt battery does not cause the fault but may prevent the code from clearing.

This code indicates that hybrid battery voltage-sensing circuit B has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

This code indicates that hybrid battery voltage-sensing circuit C has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

This code indicates that hybrid battery voltage-sensing circuit D has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

This code indicates that hybrid battery voltage-sensing circuit E has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

This code indicates that hybrid battery voltage-sensing circuit F has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

This code indicates that hybrid battery voltage-sensing circuit G has detected an open circuit or a battery-block voltage below 2.5 volts. The issue is usually in the connection between the battery block and the hybrid battery ECU or voltage sensor rather than in the individual battery module.

On applicable GM vehicles, code P0C0E indicates an open or short circuit in the drive-motor inverter voltage circuit. This is a primary inverter-system code and is not caused by the hybrid battery. The vehicle may not start or drive, and professional diagnosis is required.

Code P1116 indicates that the engine coolant temperature is outside the expected range. It may appear with code P1121 for the coolant flow-control valve, which directs coolant through the heater system. An unresolved cooling-system problem can cause the engine or inverter to overheat and may eventually damage the hybrid battery.

Code P1121 indicates a problem with the coolant flow-control valve, also known as the water-control valve. This valve regulates coolant flow through the Prius coolant storage system. The vehicle may be drivable for a short time, but fuel economy and performance can worsen as the condition progresses. If left unresolved, the vehicle may eventually fail to start and require towing.

On applicable Nissan hybrid vehicles, code P1196 indicates that the engine started when commanded but then stalled. This is a primary engine-performance code and is not caused by the hybrid battery. Engine, fuel-delivery, throttle-body, and related systems should be diagnosed before secondary codes.

On Honda hybrid vehicles, code P1440 indicates a fault involving the Motor Power Inverter module. It often appears with other codes and is not usually the primary fault. If P1440 is the only code present, Honda service information may recommend replacement of the MPI module. Professional diagnosis is recommended before repairs are performed.

Code P261B indicates that the engine control module is not detecting the expected operating speed from the electric engine coolant pump. The cause may be the pump, its sensor, wiring, or the control module. If the pump is running slowly or has stopped, the engine may overheat, stall, or suffer damage. This code is not caused by the hybrid battery.

Code P3000 is a general hybrid-system malfunction code that can be triggered by more than 200 conditions. If another hybrid-system code is present, diagnose that code first. On a Generation 2 Prius, subset code 123 may indicate the hybrid battery ECU. Subset codes 388 or 389 may indicate a fuel-delivery problem that can prevent the vehicle from starting. Dealer-level diagnosis is recommended when P3000 appears by itself or the subset code is unknown.

Code P3004 indicates a problem in the high-voltage power circuit. Possible causes include the hybrid battery, 12-volt battery, main wiring harness, or other components under the hood. The hybrid battery is the cause in approximately 60–80% of cases, but the 12-volt battery should be tested first. If its voltage is low(below 10 Volts), the relays inside the hybrid battery may not operate correctly and can trigger this code.

This code indicates that hybrid battery block 1 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 2 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 3 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 4 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 5 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 6 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 7 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 8 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 9 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 10 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 11 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 12 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 13 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 14 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 15 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 16 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

This code indicates that hybrid battery block 17 is more than 1 volt lower than the surrounding blocks. The difference may be caused by weak battery modules, cell imbalance, or increasing internal resistance. The code often appears with P0A80 and generally indicates that the hybrid battery pack requires replacement.

Code P3190 indicates that the engine started when commanded but then stalled or produced insufficient power. This is a primary engine-performance code and is not caused by the hybrid battery. Engine, fuel-delivery, throttle-body, mass-airflow, and related systems should be diagnosed first.

Code P3191 indicates that the hybrid control system commanded the engine to start, but the engine failed to run. This is a primary engine-performance code and is not caused by the hybrid battery. Engine, fuel-delivery, throttle-body, mass-airflow, and related systems should be diagnosed first.