What does B0365 mean on a Chevy?

B0365. Dual zone control switch circuit low. The HVAC module sees an implausible switch signal and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0365 on a Chevy?

Dual zone switch stuck closed in the HVAC control head Dual zone switch signal wire shorted to ground Corroded control head connector terminals Failed HVAC control head Damaged switch ribbon inside the control head

How do I fix B0365 on a Chevy?

Confirm the code with a scan tool Inspect the control head connector for corrosion Test the dual zone switch signal circuit for a short to ground Cycle the dual zone switch and watch its status on the scan tool Replace the HVAC control head only after circuit tests pass, then clear the code and retest

Code

B0365

Dual zone control switch circuit low

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

B0365. Dual zone control switch circuit low. The HVAC module sees an implausible switch signal 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

Dual zone switch stuck closed in the HVAC control head
Dual zone switch signal wire shorted to ground
Corroded control head connector terminals
Failed HVAC control head
Damaged switch ribbon inside the control head

Standard procedure

Confirm the code with a scan tool
Inspect the control head connector for corrosion
Test the dual zone switch signal circuit for a short to ground
Cycle the dual zone switch and watch its status on the scan tool
Replace the HVAC control head only after 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: qualified. Read the source limits below.

Code B0365 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0365
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0365 CHEVROLET Right Actuator Feedback Short To Ground | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0365
Fetched directly. Model and year fitment remain curator claims.
B0365 CHEVROLET Right Actuator Feedback Short To Ground | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0365
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Review note: obdii.pro GM names the dual zone control switch circuit low; the archived Chevrolet page names the right actuator feedback short to ground. The circuits differ, so the record uses the GM wording and flags the conflict

Last updated 2026-10-10.

Report a correction for B0365. Include your vehicle, the issue and a source if you have one.