P0743 on 2011-2014 Kia Sportage: Torque Converter Clutch Solenoid Fixes

What's Unique About the 2011-2014 Kia SPORTAGE

For this generation of the Kia Sportage equipped with the A6MF1 6-speed automatic transmission, Kia has issued a specific Technical Service Bulletin (TSB #TSBTRA051R1) that directly addresses P0743 and other solenoid codes. The bulletin explicitly advises technicians to replace the individual shift solenoids rather than the entire, much more expensive, transaxle assembly. This is a critical piece of information that confirms a high failure rate for the solenoid itself and provides a clear, cost-effective repair path. This issue is not unique to the Sportage but is common across the entire family of Hyundai/Kia 6-speed transmissions from this era.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• Vehicle may stall when coming to a stop
• Higher than normal engine RPM at highway speeds
• Reduced fuel economy
• Transmission may shift harshly or feel like it's slipping
• Vehicle may enter 'limp mode,' getting stuck in 3rd gear
• Shuddering when starting or stopping

Most Likely Causes

1. Failed Torque Converter Clutch (TCC) Solenoid 🔴 High Probability → Shop Automatic Transmission Torque Converter This is a well-documented issue for this platform, as confirmed by Kia's own Technical Service Bulletin (TSBTRA051R1), which recommends replacing the solenoid for this code. The A6MF1 transmission family is known for solenoid failures.
   How to confirm: A mechanic can use a scan tool to command the solenoid on and off while listening for an audible 'click'. The solenoid's internal resistance can be tested with a multimeter and should be approximately 5.1 ohms. 🎬 Watch: How to test and clean A6MF1 transmission solenoids A reading of infinite resistance (open) or near-zero (short) confirms failure.
   Typical fix: Replace the faulty TCC solenoid. This involves removing the transmission pan to access the valve body where the solenoid is located.
   Est. part cost: $60-$150
2. Damaged Wiring or Corroded Connector 🟡 Medium Probability The internal transmission wiring harness is another common failure point on these models, which can become brittle from heat and fluid exposure. The main external connector can also suffer from corrosion.
   How to confirm: Visually inspect the external transmission harness connector for corrosion or damage. Once the pan is removed, inspect the internal harness connector pins for discoloration or signs of burning. Test for continuity and voltage from the Transmission Control Module (TCM) connector to the transmission connector to identify any open or short circuits.
   Typical fix: Repair the damaged section of the wire or clean the connector pins. If the internal harness has failed, it must be replaced, which also requires removing the transmission pan.
   Est. part cost: $50-$350
3. Low or Dirty Transmission Fluid ⚪ Low Probability → Shop Transmission Assembly Many owners are unaware that these 'sealed' transmissions benefit from fluid changes. Old, degraded fluid can cause solenoids to stick, overheat, and fail. Mechanics often find significant metallic debris on the pan magnets, indicating wear that contaminates the fluid.
   How to confirm: Check the transmission fluid level and condition. The fluid should be at the correct level, pinkish-red in color, and not smell burnt. Contaminated fluid can appear dark or contain debris.
   Typical fix: Perform a transmission fluid drain-and-fill using the correct fluid type (Kia SP-IV). If the fluid is heavily contaminated, the transmission filter should also be replaced. This is often not a permanent fix for an electrical code but is critical preventative maintenance.
   Est. part cost: $50-$100
4. Faulty Transmission Control Module (TCM) ⚪ Low Probability → Shop Transmission Assembly
   How to confirm: This is typically diagnosed by exclusion. If the solenoid, wiring, and fluid are all confirmed to be good, the TCM's internal driver circuit may be at fault. The TSB suggests replacing the PCM/TCM only if the DTC returns after all other circuit repairs have been made.
   Typical fix: Replace the Transmission Control Module. The new module will require programming to the vehicle's VIN.
   Est. part cost: $200-$700

Diagnosis Steps

1. Check the transmission fluid level and condition. Address if low, dirty, or burnt-smelling.
2. Use an OBD-II scanner to check for any other transmission-related codes.
3. Inspect the main transmission wiring harness connector for any visible damage, corrosion, or loose pins.
4. With a professional scan tool (like Kia's GDS), perform an 'Actuation Test' to command the TCC solenoid on and off. Listen for a responsive 'click' from the transmission case with a stethoscope.
5. If the solenoid does not respond or the code is intermittent, test the circuit's voltage and continuity using a multimeter between the TCM and the transmission connector to rule out a wiring issue.
6. If the external wiring is confirmed to be good, the next step is to drain the fluid and drop the transmission pan to access the internal components.
7. Visually inspect the internal wiring harness for burnt pins or brittleness. Test the TCC solenoid's resistance directly with a multimeter. It should measure approximately 5.1 ohms.
8. If the solenoid's resistance is out of specification, replace it. If the solenoid tests good, the internal wiring harness is the next most likely culprit.
9. If all components and wiring test good, the fault may lie with the Transmission Control Module (TCM), as a last resort.

Parts You'll Likely Need

• Automatic Transmission Control Solenoid (TCC) (OEM #46313-3B770) — This is the most common failure part for code P0743 on this vehicle, as supported by Kia's TSB. It is functionally described as the '2-6 Brake and Torque Converter Clutch' solenoid.
  Trusted brands: Kia (OEM), Mando, Rostra
  OEM price range: $80-$130
  Aftermarket price range: $40-$90
• Internal Transmission Wiring Harness (OEM #46307-3BXXX (check catalog by VIN)) — This harness is a very common failure point, becoming brittle and causing shorts/opens for multiple solenoids. If multiple solenoid codes are present, this is highly suspect. A Hyundai TSB lists part number 46307-3B*** as the valve body harness.
  Trusted brands: Kia/Hyundai (OEM)
  OEM price range: $100-$200
  Aftermarket price range: $70-$150
• Automatic Transmission Fluid (OEM #Kia SP-IV) — Fluid must be replaced when the transmission pan is removed for solenoid replacement. Approximately 4-5 quarts are needed for a drain and fill.
  Trusted brands: Kia (OEM), Idemitsu, Valvoline
  OEM price range: $15-$25 per quart
  Aftermarket price range: $8-$15 per quart
• Automatic Transmission Pan Gasket (OEM #45283-3B010) — A new gasket is required to prevent leaks after reinstalling the transmission pan. Note that some models may use RTV sealant instead of a pre-formed gasket.
  Trusted brands: Kia (OEM), Fel-Pro, Mahle
  OEM price range: $20-$40
  Aftermarket price range: $10-$25

Related Codes That Often Appear With This One

• P0741 — This code indicates a performance issue with the TCC circuit ('Stuck Off'), and can appear alongside P0743 if the electrical fault is causing the performance problem. Both are mentioned in Kia TSBs.
• P0748, P0753, P0758, P0763, P0768, P0773 — These are all electrical fault codes for other transmission solenoids. If multiple solenoid codes appear together, it strongly suggests a common problem like a failed internal wiring harness, a bad ground, or a faulty TCM. TSB TSBTRA051R1 covers all of these codes.

Technical Service Bulletins (TSBs) & Recalls

• TSBTRA051R1: Advises on the replacement of various shift solenoids for a list of DTCs including P0743 on 6-speed automatic transaxles. It specifically instructs technicians to replace the faulty solenoid(s) rather than the entire transmission assembly to save time and cost.

Platform-Specific Known Issues

• A high failure rate of individual solenoids in the 6-speed A6MF1 automatic transmission prompted Kia to issue Technical Service Bulletin TSBTRA051R1, which advises replacing the solenoid instead of the entire transaxle.
• The internal transmission wiring harness is also a very common point of failure, often becoming brittle from heat cycles and causing intermittent electrical faults for the solenoids.
• Upon removing the transmission pan, it is common for mechanics to find a significant amount of fine, metallic 'paste' on the pan magnets, which indicates internal wear that can contaminate fluid and damage solenoids.

Mechanic-Grade Diagnostic Values

• TCC Solenoid (PWM type) Internal Resistance — expected: 5.0 - 5.1 Ω (typical range 4-7 Ω). Failure: A reading of infinite ohms (open circuit) or near-zero ohms (short circuit).
• Solenoid Supply Voltage at Transmission Connector — expected: ~12.6V (Key On, Engine Off), ~14V (Engine Running). Failure: Significantly lower voltage indicates a problem in the power supply wiring from the TCM.
• TCC Solenoid Operating Current (Live Data) — expected: 0.05 A (unlocked) to 0.75 A (locked). Failure: Readings outside this range during commanded operation point to a fault in the solenoid or the TCM driver circuit.

Scan Tool Commands That Help

• Kia GDS (or equivalent professional scanner): Actuation Test — As recommended by TSB TSBTRA051R1, this command manually activates the TCC solenoid. A technician can listen for a 'click' with a stethoscope to confirm if the solenoid is mechanically responding, helping to differentiate a bad solenoid from a wiring issue.
• Kia GDS (or equivalent professional scanner): Resetting Auto Transmission Adaptive Values / Init Of TCU Learning — This procedure is required after replacing solenoids or the transmission. It clears the learned shift adaptations from the TCM, allowing it to relearn shift points with the new components to ensure smooth operation.

Wiring & Ground Locations

• Transmission Ground — The main transmission ground point is typically located on the transmission case itself, where a ground strap or wire connects it to the vehicle's chassis.. A poor or corroded ground connection can cause erratic voltage in the solenoid circuits, leading to intermittent electrical fault codes like P0743 even if the solenoid and wiring harness are otherwise intact.
• TCM Connector C2 (White) — At the Powertrain Control Module (PCM/TCM).. Pin 11 on this connector is often the control circuit for the TCC solenoid. Technicians can test for continuity and voltage at this pin to diagnose issues with the wiring harness or the TCM's driver circuit without first accessing the transmission.

Real Owner Repair Stories

• Daniels Customs YouTube Channel (2014 Kia Sorento (uses same A6MF transmission family)) — Check Engine Light with codes P0743 and P2709.
  ❌ Tried (didn't work) Initial testing of the solenoids on the valve body showed they had correct resistance (5 ohms), indicating the solenoids themselves were not faulty.
  ✅ What actually fixed it The mechanic discovered severe corrosion inside the main transmission wiring harness connector, specifically on pins 5 and 10, which had lost continuity. The final repair was the replacement of both the external (transmission-to-computer) and internal transmission wiring harnesses.

Model Year Variations Within This Range

• 2011-2014: The 2011-2014 Kia Sportage with the 2.0L or 2.4L engine uses the A6MF1 variant of the Hyundai/Kia 6-speed automatic transmission. While mechanically similar across these years, it's crucial to verify part numbers by VIN, as minor changes to harnesses or solenoids can occur mid-cycle. The A6MF1 is rated for engines with a maximum torque of around 170 lb-ft.