What does B0189 mean on a Chevy?

B0189. Right side solar load sensor reads out of range. The HVAC module ignores that sun load input and sets a body warning light. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0189 on a Chevy?

Right side solar load sensor element drifted out of range Open in the right side solar load sensor signal circuit Corroded or loose right side solar load sensor connector Dirty or obstructed right side solar load sensor lens Faulty input inside the HVAC control module

How do I fix B0189 on a Chevy?

Confirm the code with a scan tool and watch the right side solar load sensor reading in direct sun Inspect and reseat the right side solar load sensor connector Clean the right side solar load sensor lens and clear anything covering it Test the right side solar load sensor resistance against the service chart Replace the right side solar load sensor only if it reads out of range under a known light load, then clear the code and retest

Code

B0189

Right side solar load sensor reads out of range

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

B0189. Right side solar load sensor reads out of range. The HVAC module ignores that sun load input and sets a body warning light. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Findings, check these first

Right side solar load sensor element drifted out of range
Open in the right side solar load sensor signal circuit
Corroded or loose right side solar load sensor connector
Dirty or obstructed right side solar load sensor lens
Faulty input inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and watch the right side solar load sensor reading in direct sun
Inspect and reseat the right side solar load sensor connector
Clean the right side solar load sensor lens and clear anything covering it
Test the right side solar load sensor resistance against the service chart
Replace the right side solar load sensor only if it reads out of range under a known light load, 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 B0189 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0189
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0189 CHEVROLET Sunload Sensor 2 Circuit Performance | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes
Fetched directly. Model and year fitment remain curator claims.
B0189 CHEVROLET Sunload Sensor 2 Circuit Performance | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Last updated 2026-10-10.

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