Have Toyota Questions? Ask a Mechanic for Answers ASAP
The check hybrid system light normally comes on when the vehicle's computer detects a fault in the hybrid battery. Sometimes it's low voltage from the battery, sometimes it's an internal short in the battery- either way it almost always triggers fault codes in the computer system. These fault codes can be read with a compatible scan tool.
You may need a replacement hybrid battery, depending on which codes are stored.
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