C1614 on 2011-2016 Hyundai Equus — ABS Control Module Self-Test Failed
1 vehicles · 1 makes · $800-$3,000 repair
How to diagnose and fix C1614: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Hyundai Equus · 2011–2016
The Hyundai Equus flagship sedan uses rear air suspension for luxury ride quality. The air struts develop leaks at the rubber air bladder, particularly at the crimp ring seals, typically after 5-7 years regardless of mileage. The air compressor runs excessively to compensate for leaking struts, leading to compressor overheating and premature failure. The vehicle sags at the rear when parked overnight as air slowly escapes.
Common Symptoms
- Vehicle rear end sags after sitting overnight
- Air compressor running constantly (humming from trunk)
- Suspension warning light on dashboard
- Bouncy or floaty rear end ride quality
- Rear of vehicle lower than front when parked
How to Fix
Replace both rear air struts together — Arnott A-2951 or Suncore 150G-75-R are quality aftermarket options at 50% less than OEM. Replace the compressor if it is running constantly or making excessive noise. A conversion to passive coil spring struts is possible using Strutmasters or Arnott coil-over conversion kits, though this changes the ride character. The compressor relay should be checked first as a $20 relay failure can mimic compressor failure.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Suncore 380H-15-R-PAIR rear air-spring pairOEMSuncore 380H-15-R-PAIR
matched left/right rear air-spring replacement after leak testing proves one or both rear springs leak Fitment/availability: 2011-2016 Hyundai Equus with factory electronic air suspension. Pair contains left 380H-15-RL and right 380H-15-…
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Owner tips & cautions
- TipCheck the compressor relay first ($20 part) before replacing the $500+ compressor — a stuck relay is the cause in about 25% of cases
- WarningReplace BOTH rear air struts together even if only one is leaking — the other is the same age and will fail within months
Sources for this issue (3)
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C1614 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1614 mean?
C1614 stands for "ABS Control Module Self-Test Failed." This code means the ABS control module failed its own internal self-test. Each time the system powers up (and periodically), the ABS module checks its internal circuitry, memory, and processing to confirm it can operate safely; this code is set when that self-check fails. It usually indicates an internal hardware or software fault within the module rather than an external sensor problem. ABS and related traction/stability features will be disabled while normal braking continues, and the module often must be repaired or replaced.
What are the most common causes of C1614?
The most common causes of C1614 are: Internal fault within the ABS control module, Corrupted module software/calibration, Low or unstable supply voltage to the module, Poor power or ground connections at the module, Moisture/corrosion intrusion into the module, Damaged module connector pins, Faulty 12V battery or charging system. The specific cause varies by vehicle.
How much does it cost to fix C1614?
Repair costs for C1614 range from $800 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by C1614?
Au7o has documented C1614 across 1 vehicle models from 1 manufacturers: Hyundai.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.