How To Fix P0698 Code - Sensor Reference Voltage C Circuit Low Troubleshooting
Knowing how to fix P0698 code is essential if your drivetrain or transfer case is acting up and refusing to switch between modes. This low reference voltage C circuit code usually means one of your sensors is not getting the five volts it needs from the powertrain control module to function correctly. This can cause your transmission to skip sport or economy modes or prevent your four wheel drive from engaging when you really need it. In this video, we explain how to use a digital volt ohmmeter to test the reference voltage and ground signals at the sensor connector. You should always check for blown fuses or a faulty system power relay before assuming the sensor itself is bad. We walk through the process of inspecting the wiring harness for burnt spots and checking sensor resistance against factory specs. It is very important to disconnect your controllers before doing continuity tests so you do not damage the expensive computer modules. Following these professional troubleshooting steps will help you pinpoint the exact cause of the low voltage and get your speedometer and transmission back to normal operation.
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