Code Definition

B2211 — Low Coolant Lamp Output Circuit Short to Battery

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2211

B2211 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2211 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2211 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The B2211 fault code indicates that the body control module (BCM) has detected a short to battery voltage on the output circuit driving the low coolant warning lamp. The BCM controls the low coolant lamp by switching the lamp circuit to ground when the engine coolant level sensor reports a low condition, with the lamp itself fed by ignition or battery voltage. The fault is set when the BCM sees battery voltage on its lamp control output during a period when it has commanded the output off, indicating an external short between the control wire and a positive supply. With this fault active, the ...

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