2017 Kia Optima cruise control problems
moderate Owners of the 2017 Kia Optima have filed 10 NHTSA complaints about the cruise control at roughly $600 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See cruise control across all vehicles →
| Model year | cruise control complaints |
|---|---|
| 2013 Optima | 25 |
| 2014 Optima | 12 |
| 2015 Optima | 24 |
| 2016 Optima | 19 |
| 2017 Optima (this page) | 10 |
| 2018 Optima | 6 |
| 2019 Optima | 6 |
The failure pattern owners describe
The 2017 Optima shows multiple interconnected drivability failures. Owners report adaptive cruise control that fails to detect large trucks in traffic, then suddenly accelerates into them—one owner got within 5 feet of an 18-wheeler before manually braking. The knock sensor (code P1326) causes sudden loss of acceleration, with the car maxing out at 20–25 mph; one owner had it replaced twice in as many days without fixing the problem. Throttle response fails entirely at times, taking 4+ seconds to react at highway speeds, and dealerships can't replicate or fix it. The variable charge motion actuator (P200a) causes stalling at idle and hesitation during acceleration. One owner reports a KSDS component failure causing stalling, misfiring, and shaking that a dealership claimed to repair under recall but actually didn't. Wheel speed sensors are failing in pairs (front and rear together), with one dealership tech confirming 4–5 failures per week at their shop. Dealerships have been unable or unwilling to diagnose and repair many of these issues, even when recalls are known to exist. This pattern of unresolved safety-related failures under warranty is the core concern.
Same Kia Optima cruise control reports on nearby years: 2014 · 2015 · 2016
Failure modes owners describe
Adaptive Cruise Control Fails to Detect Large Vehicles
Adaptive cruise control system fails to recognize large vehicles (18-wheelers) as obstacles in certain traffic scenarios. When a vehicle ahead changes lanes at low speeds, the system registers the cleared space and attempts to accelerate back to set speed without detecting the large vehicle directly ahead, creating collision risk.
When: During slow-speed traffic conditions after vehicle ahead changes lanes
Symptoms owners cite: Adaptive cruise control accelerates without detecting 18-wheeler directly ahead; System only registers lane clearing rather than actual vehicle presence; Acceleration continues despite vehicle within 5 feet of truck
Repairs/costs cited: Camera recalibration did not resolve the issue; owner states logs needed for diagnosis
Knock Sensor Failure Causing Acceleration Loss
Knock sensor failures result in severe acceleration loss and limp-mode drivability. Multiple owners report dramatic reductions in acceleration capability (down to 20-25 mph), sometimes recurring after replacement. Generates P1326 fault code.
When: Occurs repeatedly, sometimes within days of replacement; one incident on expressway at low mileage
Symptoms owners cite: Sudden loss of acceleration power to 20-25 mph; Jerking upon acceleration attempt; Unable to accelerate above certain speed threshold; Vehicle nearly unresponsive to throttle input
Codes mentioned: P1326
Repairs/costs cited: Knock sensor replacement attempted multiple times without sustained resolution; one owner reports replacement performed twice within days of each other
Recalls/TSBs owners mention: Appears to be a recall item on 2016 and 2017 models; one owner reports dealership claimed repair was completed when it was not
Throttle Response Lag and Unresponsiveness
Accelerator pedal input produces delayed or no response from the engine. Takes 4+ seconds for vehicle to respond after throttle depression, or vehicle does not respond at all on initial attempts. Occurs at highway speeds during lane-change maneuvers.
When: At 65 mph during lane changes; also at low mileage (450 miles); occurred multiple times for different owners
Symptoms owners cite: 4-second delay in acceleration response; Complete non-response to accelerator depression; Multiple attempts required to get vehicle to operate normally; Failure occurs without warning
Repairs/costs cited: Dealerships unable to replicate or diagnose the issue
Recalls/TSBs owners mention: Manufacturer notified but did not assist; vehicle not repaired
Variable Charge Motion Actuator (VCMA) Failure
Variable Charge Motion Actuator on the intake manifold fails, causing hesitation during acceleration and stalling sensation at idle. Generates P200a fault code. Related to Technical Service Bulletin on 2016 Kia Optimas and affects 2017 models.
When: At 17,000 miles
Symptoms owners cite: Hesitation when accelerating; Stalling sensation while idling; Stalling sensation at traffic lights
Codes mentioned: P200a
Repairs/costs cited: Repaired at dealership by replacing VCMA; repair completed 8-30-23
Recalls/TSBs owners mention: Technical Service Bulletin exists for same condition on 2016 models; recall appears to exist for this issue
KSDS Engine Component Failure
KSDS (Knock Sensor Detection System or related engine component) causes engine failure characterized by stalling, lagging, and misfiring. Vehicle shakes and requires multiple ignition cycles to restart. Check engine light flashes and vehicle loses power during acceleration in traffic.
When: Multiple occurrences; issue not resolved after initial dealership visit
Symptoms owners cite: Stalling without warning; Lagging during acceleration; Misfiring causing vehicle shake; Multiple restarts required; Loss of power during traffic acceleration; Flashing check engine light
Repairs/costs cited: Dealership failed to repair the problem during initial service despite owner identifying recall
Recalls/TSBs owners mention: Recall issued; dealership claimed repair was completed but was not; Kia contacted but response pending
Wheel Speed Sensor Failures
Both front and rear passenger-side wheel speed sensors failed within one week of each other. Causes AEB (Automatic Emergency Braking) system service warning on dashboard. Dealership technician indicated this is a common failure pattern, seeing 4-5 vehicles per week with the same issue.
When: Within one week of each other
Symptoms owners cite: Dashboard prompt at startup for AEB system service; Consistent AEB system warning display after scan; Mileage discrepancy visible in automatic scan data
Repairs/costs cited: Dealership identified as common issue; 4-5 vehicles per week reported with same failure
Cruise Control Intermittent Failure
Cruise control system does not function reliably, operating intermittently throughout vehicle ownership. No specific diagnostic information provided.
When: Intermittent throughout vehicle ownership
Symptoms owners cite: Cruise control does not work a lot of the time
Engine Lockup and Speed Limiter Malfunction
Engine locks up and vehicle will not exceed 60 mph. Owner reports these are known recall issues for this model year that dealership acknowledges but has not addressed.
When: One year of ownership
Symptoms owners cite: Engine lockup; Vehicle unable to exceed 60 mph
Repairs/costs cited: Dealership unwilling to repair despite owner notification
Recalls/TSBs owners mention: Known recall on this vehicle type; dealership aware but not performing repair
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Common questions
How serious is the cruise control problem on the 2017 Kia Optima?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $600 and most owners catch it before it causes a breakdown.
At what mileage does the cruise control typically fail?
Based on the 10 complaints filed, cruise control issues most often appear around 20,526 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $600 for cruise control repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to cruise control?
No active recalls currently cover cruise control issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.