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What is the reason for the open circuit of the P275300 transmission oil cooling valve?

2 Answers

MacHarley

07/29/25 11:10pm

This situation may be caused by damage to the circuit board on the valve body. You can go to the shop to replace the two circuits. Here is more information about P275300: 1. Function: Transmission oil cooler control circuit/open circuit. 2. Fault description: The transmission fluid cooler is used to reduce the temperature of the transmission fluid to prevent the transmission fluid from deteriorating due to excessive temperature when the car is operating under high load. Additional information: 1. Transmission oil: Transmission oil is a lubricant used to keep the gear system clean, ensuring the normal operation of the transmission and extending the service life of the transmission device. 2. Function of transmission oil: Original manufacturers have their own specified dedicated transmission oil. Different transmission oils are one of the factors that affect the quality of gear shifting.

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DelAdelyn

08/16/25 1:22am

This trouble code P275300 generally indicates an open circuit in the transmission oil cooling valve. As someone who has been repairing cars for over a decade, I can say this issue is both common and tricky. The core causes could be aging and broken wiring harnesses, or loose connectors causing poor contact—especially in areas with significant chassis vibration on older vehicles. Additionally, a short circuit or failure in the control module might send incorrect signals, preventing the valve from receiving power. The valve itself getting stuck or clogged can also trigger an open-circuit warning. During inspection, I would first check if the fuse is blown, then use a multimeter to measure wire resistance to locate the open circuit before replacing wires or cleaning connectors. Delaying repairs can lead to transmission overheating and failure, which would cost far more than just the few hundred dollars for a valve replacement. I recommend regular maintenance checks on wiring harnesses and avoiding water puddles when parking to prevent corrosion. In short, don't force the vehicle to run—seek professional help for safety, as vehicle safety should always come first.

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