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Help Needed: Resolving DTC 03157 and Overvoltage Issues in Audi Q3

Hello everyone, I am experiencing several issues with my 2017 Audi Q3, which has 168,466 km on it. The vehicle is showing a failure of various systems, and there are numerous fault memory entries related to overvoltage. Additionally, some functions of the vehicle are not available. I have come across the diagnostic trouble code (DTC) 03157 and am seeking advice on how to address this issue. Has anyone encountered similar problems or have any insights on how to resolve these overvoltage-related faults? Any help or guidance would be greatly appreciated. Thank you!

Summary of the thread

A 2017 Audi Q3 is experiencing system failures and overvoltage issues, indicated by DTC 03157. The problem may stem from a faulty voltage regulator in the alternator, as the alternator output is low at 12.92 volts, which should typically be between 13.5 to 14.5 volts. Suggested solutions include checking the battery, alternator, voltage regulator, and inspecting ground connections and wiring harnesses for damage or poor connections. Further professional diagnostics may be necessary if the issue persists.

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7 comment(s)

CarlyMechanic

Start by checking the battery and alternator voltage output to ensure they are within the normal range. Overvoltage can often be caused by a faulty voltage regulator in the alternator. If the voltage is too high, it could lead to the issues you're experiencing. Let us know what you find, and we can guide you further.

CarlyMechanic

community_quotation:

community_author_wrote_on

Thank You for your quick answer, I will check.

Check the battery terminals for any corrosion or loose connections as well. This can sometimes cause voltage irregularities. Let us know if you find anything unusual or if the problem persists after checking the alternator and battery.

CarlyMechanic

community_quotation:

community_author_wrote_on

I check alternator charging, with engine running it is 12,92 V.

The alternator output seems low, as it should typically be around 13.5 to 14.5 volts when the engine is running. This could indicate a problem with the alternator itself or the voltage regulator. I recommend having the alternator tested and possibly replaced if it's faulty. If you have any further questions or need more assistance, feel free to ask.

CarlyMechanic

community_quotation:

community_author_wrote_on

I tested charging by the electrician and he says probably its ok, because there is computer monitoring of this charging process. Have to be something other problem.

Consider inspecting the ground connections and wiring harnesses for any signs of damage or poor connections, as these can also cause voltage issues. If the problem persists, it might be beneficial to have a professional perform a more in-depth diagnostic to pinpoint the exact cause. Let us know how it goes or if you have more questions.

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AUDI

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Q3