What does B0158 mean on a Chevy?

B0158. Outside air temperature sensor circuit malfunction. The HVAC module loses its ambient reading and sets a body warning light. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0158 on a Chevy?

Failed outside air temperature sensor with an out of range element Open or short in the outside air temperature sensor signal circuit Corroded or loose outside air temperature sensor connector Outside air temperature sensor blocked or contaminated by debris Faulty input inside the HVAC control module

How do I fix B0158 on a Chevy?

Confirm the code with a scan tool and compare the outside air temperature reading to a known temperature Inspect and reseat the outside air temperature sensor connector and check for corrosion Test the outside air temperature sensor and its signal circuit against the service chart Repair any chafed or open wiring before condemning the sensor Replace the outside air temperature sensor only if its reading does not match actual temperature, then clear the code and retest

Code

B0158

Outside air temperature sensor circuit malfunction

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

B0158. Outside air temperature sensor circuit malfunction. The HVAC module loses its ambient reading 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

Failed outside air temperature sensor with an out of range element
Open or short in the outside air temperature sensor signal circuit
Corroded or loose outside air temperature sensor connector
Outside air temperature sensor blocked or contaminated by debris
Faulty input inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and compare the outside air temperature reading to a known temperature
Inspect and reseat the outside air temperature sensor connector and check for corrosion
Test the outside air temperature sensor and its signal circuit against the service chart
Repair any chafed or open wiring before condemning the sensor
Replace the outside air temperature sensor only if its reading does not match actual temperature, 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 B0158 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0158
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0158 CHEVROLET Ambient Air Temperature Sensor Circuit | 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.
B0158 CHEVROLET Ambient Air Temperature Sensor Circuit | 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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