Interior Air Conditioning Function Restriction (Static) — stored in the Climatronic Control Module (J979); blocks the radiator-fan request so the A/C cools poorly. A consequence code: fix the preceding Climatronic faults first (Volkswagen, 2024+ Atlas / Atlas Cross Sport)
The U1935 code means the vehicle's onboard diagnostic system has detected: Interior Air Conditioning Function Restriction (Static) — stored in the Climatronic Control Module (J979); blocks the radiator-fan request so the A/C cools poorly. A consequence code: fix the preceding Climatronic faults first (Volkswagen, 2024+ Atlas / Atlas Cross Sport). This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. U1935 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
Probable Causes (Ranked by Likelihood)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Frequently Asked Questions
Does U1935 mean the same thing on every vehicle?
No. U1935 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does U1935 most likely indicate?
Interior Air Conditioning Function Restriction (Static) — stored in the Climatronic Control Module (J979); blocks the radiator-fan request so the A/C cools poorly. A consequence code: fix the preceding Climatronic faults first (Volkswagen, 2024+ Atlas / Atlas Cross Sport). Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
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Confirm your exact make, model, and year first — U1935 is manufacturer-specific and can mean different things across brands.
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Read U1935 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- Volkswagen Group of America Technical Service Bulletin 87-24-03 (2024-09-24), hosted on NHTSAClimatronic control module J979, DTC U193500 "Interior Air Conditioning Function Restriction (Static)"
Commonly Affected Vehicles
- 2015-2023 Volkswagen Golf
- 2016-2024 BMW 3 Series
- 2017-2025 Audi A4
- 2018-2025 Mercedes-Benz C-Class
Related Codes
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