What does B0211 mean on a Chevy?

B0211. Rear blower motor speed circuit high. The auxiliary blower gets more speed signal than commanded and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0211 on a Chevy?

Rear blower speed signal circuit shorted to voltage Rear blower control module holding the speed signal high Open in the rear blower speed return circuit Corroded rear blower connector or ground Faulty output inside the rear blower control module

How do I fix B0211 on a Chevy?

Confirm the code with a scan tool and command a low rear auxiliary blower speed Measure the rear blower speed signal voltage at the control module Inspect and reseat the rear blower motor connector Test the rear blower speed circuit for a short to voltage Replace the rear blower or control module only after the circuit tests pass, then clear the code and retest

Code

B0211

Rear blower motor speed circuit high

Category: Body
Severity: Body Warning Light
Applies to: Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code
Related: No single generic twin. See OBD Codes List

What it means

B0211. Rear blower motor speed circuit high. The auxiliary blower gets more speed signal than commanded and the body warning light comes on. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Findings, check these first

Rear blower speed signal circuit shorted to voltage
Rear blower control module holding the speed signal high
Open in the rear blower speed return circuit
Corroded rear blower connector or ground
Faulty output inside the rear blower control module

Standard procedure

Confirm the code with a scan tool and command a low rear auxiliary blower speed
Measure the rear blower speed signal voltage at the control module
Inspect and reseat the rear blower motor connector
Test the rear blower speed circuit for a short to voltage
Replace the rear blower or control module only after the circuit tests pass, then clear the code and retest

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: checked against the recorded source material.

Code B0211 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0211
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0211 CHEVROLET Rear Blower Motor Speed High | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0211
Fetched directly. Model and year fitment remain curator claims.
B0211 CHEVROLET Rear Blower Motor Speed High | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0211
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Last updated 2026-10-10.

Report a correction for B0211. Include your vehicle, the issue and a source if you have one.