Code Definition

B2515 — Heater Blower Relay Circuit Failure

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

About B2515

B2515 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 B2515 is stored, the module has detected 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 B2515 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 Body Control Module (BCM) or HVAC controller monitors the heater blower relay control circuit using a sense or feedback line on its low side driver. DTC B2515 is set when the controller detects an out of range condition on the heater blower relay control circuit, such as an open circuit, a short to ground, or a failure of the relay to respond to the commanded state. The heater blower relay supplies battery power to the blower motor and is normally switched on the ground side by the controller. When this code sets the blower may not operate at all, may operate erratically across all speeds,...

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