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sprinkles08, ASE Certified Technician
Category: Infiniti
Satisfied Customers: 22822
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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I have 2006 infinity qx56 come into my shop with a/c not

Customer Question

I have 2006 infinity qx56 come into my shop with a/c not working .I scanned the vehicle got code B257C for ambient sensor .I replaced the sensor a/c works .the following day customer returned same code is back a/c stopped working.
Submitted: 1 year ago.
Category: Infiniti
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

I don't have reference for this code in the service information but if it's setting an ambient temperature sensor code with a known good sensor then there has to be a wiring or connection issue. You may have an open circuit, short to power or ground, high resistance due to internal wire corrosion, or there could be an issue with the connector terminals. Start by taking a close look at the connector terminals, if ok and there are no visible wiring issues then the wiring will need to be tested at the time the code is active.

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