Diagnosing a PCM Ground Fault – 2013 Mazda6 | Code P0138 Fix
Автор: Christopher Johnson
Загружено: 2025-05-26
Просмотров: 1504
Diagnosing a PCM Ground Fault – 2013 Mazda6 | Code P0138 Fix
In this video, we dive into a diagnostic case on a 2013 Mazda6 that came in with a P0138 – O2 Sensor Circuit High Voltage trouble code. After performing voltage checks up to the rear O2 sensor, we identified an excessive voltage drop on the PCM-controlled ground circuit—a clear indicator of an internal PCM issue.
To verify the fault, we used a test light, which not only confirmed the problem but also made it easier to demonstrate the process hands-free on camera.
✅ Confirmed Diagnosis: Faulty PCM ground circuit
🛠️ Solution: PCM replacement required to restore proper O2 sensor function
🔧 Tools Used: Multimeter, test light, scan tool
If you're dealing with oxygen sensor codes or strange voltage readings, this might help shed some light on your own diagnostics!
Don’t forget to like, subscribe, and drop a comment if you’ve run into something similar.
#Mazda6 #P0138 #Diagnostics #O2Sensor #PCMFailure #AutomotiveRepair #CobourgMazda
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