B1057 — 8 documented meanings by make

B1057 does not mean the same thing on every car — manufacturers reuse the number for different faults. 9 makes document it: Chrysler, Ford, Honda, Mazda, Mitsubishi, Opel / Vauxhall, Saab, Subaru, Suzuki. Find your make below.

B1057 on Chrysler

On Chrysler vehicles B1057 is documented as: Rear blend door travel range too large. B1057 points at door / window / lock (rear). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Chrysler codes:

B1057 on Ford, Mazda

On Ford, Mazda vehicles B1057 is documented as: Airbag cross link to another firing loop nr. 1, front driver's side. B1057 points at airbag / restraint system (front). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Ford, Mazda codes:

B1057 on Honda

On Honda vehicles B1057 is documented as: Relay control module lost communication with MULTIPLEX integrated control unit, door switch message. B1057 is stored when the ECU sees no signal on CAN bus communication. 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: Module has no power or no ground; Broken bus wire or a bad splice in the network; The module itself has failed; Terminating resistor or bus fault taking the network down.

Check first, cheapest first:

1. Check power and ground at the module before suspecting the module itself
2. Read whether other modules on the same bus also report faults — that separates a network fault from a single module
3. Inspect connectors at the module and any inline joints
4. Measure bus resistance across the two lines at the diagnostic socket
5. Replace the module last, once supply and network are proven good

Related Honda codes:

B1057 on Mitsubishi

On Mitsubishi vehicles B1057 is documented as: Rear air mix damper travel too large.

Related Mitsubishi codes:

B1057 on Opel / Vauxhall

On Opel / Vauxhall vehicles B1057 is documented as: Passenger's side airbag activated. B1057 points at airbag / restraint system. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Opel / Vauxhall codes:

B1057 on Saab

On Saab vehicles B1057 is documented as: Rear right speaker, short circuit to ground. B1057 is stored when the ECU sees short to ground on the circuit named in the code (rear right). 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: Wiring insulation chafed through where the loom passes a bracket or edge; Water or salt in a connector bridging the signal pin to the body; The component itself shorted internally; A harness pinched during earlier repair work.

Check first, cheapest first:

1. Unplug the component and re-read the code — if it changes, the fault is in the component, not the wiring
2. Inspect the loom where it passes metal edges, brackets and hinges
3. Open the connector and check for green corrosion or moisture
4. Measure resistance from the signal pin to a body ground; near-zero confirms the short
5. Repair the harness section, or replace the component if it shorted internally

Related Saab codes:

B1057 on Subaru

On Subaru vehicles B1057 is documented as: Sensing and diagnostic module sideward crash, passenger's side detected.

Related Subaru codes:

B1057 on Suzuki

On Suzuki vehicles B1057 is documented as: Passenger's pretensioner, short circuit to ground or sideward crash on passenger's side detected. B1057 is stored when the ECU sees short to ground on the circuit named in the code. 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: Wiring insulation chafed through where the loom passes a bracket or edge; Water or salt in a connector bridging the signal pin to the body; The component itself shorted internally; A harness pinched during earlier repair work.

Check first, cheapest first:

1. Unplug the component and re-read the code — if it changes, the fault is in the component, not the wiring
2. Inspect the loom where it passes metal edges, brackets and hinges
3. Open the connector and check for green corrosion or moisture
4. Measure resistance from the signal pin to a body ground; near-zero confirms the short
5. Repair the harness section, or replace the component if it shorted internally

Related Suzuki 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

B1xxx is body systems, manufacturer-specific.

Severity

Manufacturer-specific body system — needs a brand scanner to read the actual cause.

That is what holds for B1057 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.