Code Definition

B0515 — RH heater discharge temperature sensor signal error

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

About B0515

B0515 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 B0515 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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 B0515 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

DTC B0515 is a generic body code that indicates the HVAC control module has detected an invalid, erratic, or out-of-range signal from the right-hand heater discharge air temperature sensor. This sensor is a small NTC thermistor mounted in the right-hand heater outlet of the HVAC case downstream of the heater core, and the climate module uses its reading as closed-loop feedback to verify the actual heated air temperature on the right side and trim the right blend door position to match the driver's setpoint. The code sets when the signal voltage is implausibly high (open or near-reference), imp...

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