The P0B37: High Voltage Service Disconnect Circuit Intermittent/Erratic code indicates that the high voltage service disconnect circuit is providing intermittent or erratic readings. This could be caused by a faulty disconnect switch, wiring issues, or a control module problem. If left unresolved, it may prevent the safe and proper isolation of high voltage components, potentially causing safety risks.
P0B37 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B37: High Voltage Service Disconnect Circuit Intermittent/Erratic |
| Is it serious? | Yes, intermittent or erratic readings can affect the system’s ability to safely isolate high voltage components. |
| Possible causes | – Intermittent or erratic readings from high voltage service disconnect circuit – Faulty disconnect switch or wiring – Control module issue |
| How to diagnose? | – Test for intermittent or erratic readings – Inspect disconnect switch and wiring – Check control module functionality |
P0B37 Meaning
The P0B37 code is set when the high voltage service disconnect circuit experiences intermittent or erratic voltage readings. This could be due to a malfunctioning disconnect switch, faulty wiring, or a problem with the control module. If not addressed, it may affect the proper isolation of high voltage components, leading to potential safety hazards and system malfunctions.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional related codes that may provide further insight. | OBD-II Scanner |
| Test for Intermittent or Erratic Readings | Use a multimeter or diagnostic tool to monitor the high voltage service disconnect circuit for fluctuations or inconsistent readings. | Multimeter, Diagnostic Tool |
| Inspect Disconnect Switch and Wiring | Inspect the high voltage disconnect switch and associated wiring for damage, loose connections, or corrosion. Replace faulty components as needed. | Flashlight, Multimeter, Safety Gloves |
| Check Control Module Functionality | Test the control module for proper communication and functionality. If faulty, reprogram or replace the module. | Diagnostic Tool |
| Clear the Code and Test Drive | After completing repairs, clear the code and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Rescan the vehicle after the test drive to confirm that the P0B37 code does not return. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko