B2782 — 3 documented meanings by make

B2782 does not mean the same thing on every car — manufacturers reuse the number for different faults. 3 makes document it: Chevrolet (USA), Mazda, Toyota. Find your make below.

B2782 on Chevrolet (USA)

On Chevrolet (USA) vehicles B2782 is documented as: Pass key pellet resistance not programmed. B2782 is stored when the ECU sees not configured on immobiliser / key. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.

Usually one of: Replacement module fitted but never coded to the car; Configuration lost after a battery or software event; Wrong part number for this vehicle specification; Adaptation or learning procedure not carried out after a repair.

Check first, cheapest first:

1. This is a coding fault, not a broken part — do not replace anything yet
2. Confirm the fitted module part number matches the vehicle specification
3. Run the coding or adaptation procedure with equipment that supports this brand
4. Re-check for the code after the adaptation completes

Related Chevrolet (USA) codes:

B2782 on Mazda

On Mazda vehicles B2782 is documented as: Interior air quality sensor to (DATC) short circuit.

Related Mazda codes:

B2782 on Toyota

On Toyota vehicles B2782 is documented as: Steering lock motor drive control. B2782 points at steering. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Toyota codes:

Which one is yours

A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:

1. Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
2. Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
3. Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
4. If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.

Code family

B2xxx is body systems, manufacturer-specific.

Severity

Manufacturer-specific body system — usually doors, windows, lighting or comfort functions.

That is what holds for B2782 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.