C1260 on Kia: How to Diagnose & Fix
Steering Angle Sensor Circuit / Signal (manufacturer-specific)
1 Kia model · 1 documented issue · 1 critical · $50-$900 repair
C1260 on Kia by model: symptoms, diagnosis and fix
On 1.6T turbocharged K5 variants, some owners and NHTSA complainants have reported a hissing sound from the brake booster area upon brake pedal application, accompanied by a noticeably harder brake pedal and reduced power assistance. The GDi turbocharged engine uses an electric vacuum pump to supplement braking assist; failures or leaks in the vacuum pump, vacuum check valve, or booster hose connection reduce available vacuum and compromise brake pedal feel and stopping distance. This has been flagged as a safety concern in NHTSA filings.
Common Symptoms
- Hissing sound when brake pedal is pressed
- Hard or stiff brake pedal requiring significantly more force to stop
- Longer stopping distances than normal
- Brake warning light or low vacuum warning illumination
- Brake pedal feel improving after engine warms up then worsening again
How to Fix
Inspection of the vacuum pump, vacuum reservoir, check valve, and all vacuum lines connecting to the brake booster is required. The electric vacuum pump (Kia/Mobis part number 59100-L2000 or per VIN) may require replacement if output is below specification. The vacuum check valve (a common failure point) is a lower-cost item at approximately $20–$50. Full vacuum pump replacement is $300–$700 parts and labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Kia 28810-2M810 mechanical brake-vacuum pumpOEMKia 28810-2M810, superseded by 28810-2M831
Replace the engine-driven pump after a vacuum-output test confirms pump failure Fitment/availability: 2021-2024 Kia K5 with 1.6L Gamma-II turbo; seller shows supersession to 28810-2M831. Confirm VIN and current EPC before ordering, and d…
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C1260 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 C1260 mean on a Kia?
C1260 stands for "Steering Angle Sensor Circuit / Signal (manufacturer-specific)." C1260 is a chassis code most commonly defined as a fault in the steering angle sensor (SAS) circuit or signal, used widely on Hyundai/Kia and GM vehicles (some platforms apply it to a wheel-speed comparison fault instead). The ABS/stability-control module relies on the SAS to know the steering wheel's angle and direction for electronic stability control calculations, and it sets this code when that signal is missing, corrupt, or illogical. The result is typically disabled stability/traction control with warning lights. Because the exact definition varies by make, confirm against the vehicle's service data. On Kia it is documented across 1 model: K5.
What are the most common causes of C1260?
The most common causes of C1260 are: Faulty steering angle sensor, Steering angle sensor needs recalibration/initialization, Worn steering coupler/clock spring (common on Hyundai/Kia), Damaged wiring or connector to the SAS, CAN communication fault between SAS and ABS module, Faulty ABS/ESC control module, Recent steering or suspension work without recalibration. The specific cause varies by vehicle.
How much does it cost to fix C1260 on a Kia?
Published repair estimates on Kia range from $50 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C1260 on a different make?
View C1260 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.