B0120 — Fluid Reservoir Level Sensor E

This code refers to fluid-reservoir level sensor E. The general description does not identify which fluid reservoir is involved, prove that its level is low, or specify an electrical failure mode. Confirm the vehicle and control module's own diagnostic description before testing parts.

Affected system: Body

Symptoms

• System warning may illuminate
• Affected feature may be unavailable
• Symptoms depend on the vehicle

Possible causes

• Connector or wiring fault, sensor or actuator fault, or a body control module power or ground issue
• Module power, ground, or connector fault
• Vehicle-specific mechanical or control issue

What to check

• Record all available module faults
• Read the body or restraint module with a compatible scan tool. Identify the affected circuit and follow the vehicle-specific safety and test procedure before touching related components.
• Compare results with vehicle-specific service information
• Verify the repair
• Read the body or restraint module with a compatible scan tool. Identify the affected circuit and follow the vehicle-specific safety and test procedure before touching related components.
• Repair the verified cause and rescan all affected modules

Also written as: B0120-00, B012000, BO120 (some scan tools add the fault-type byte, e.g. -00).