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The C1259 diagnostic trouble code on a 2007 Toyota Camry Hybrid signals a problem with the HV System Regenerative function. This typically indicates a malfunction in the hybrid control system or a defective hybrid control ECU. If you see this code, it's probable that your ABS warning light is on as well. To address this issue, you may soon need to replace the hybrid engine control unit, which can be a costly part costing around $200 or more. While it may not be a critical issue initially, it can impact braking power, so it's important to take precautions. If left unfixed for too long, the problem could escalate, leading to more significant troubles down the road.
In a 2007 Toyota Camry Hybrid, when you see the code "c1259," it typically means there is a problem with the hybrid control electronic control unit (ECU).