P0700 on 2010-2013 Kia Soul: Transmission Control System Malfunction Causes and Fixes

What's Unique About the 2010-2013 Kia Soul

The 2010-2013 Kia Soul spans two different automatic transmissions, which affects the diagnosis. The 2010-2011 models primarily use a 4-speed automatic (A4CF series), while the 2012-2013 models use a 6-speed (A6GF1/A6MF1). The 6-speed A6GF1 transmission is notorious for solenoid failures, an issue so common that Kia issued a Technical Service Bulletin (TSBTRA051R1) advising technicians to replace individual solenoids rather than the entire transmission for related codes. Therefore, a P0700 on a 2012 or 2013 Soul is highly likely to be accompanied by a solenoid-related code (e.g., P0753, P0773).

Symptoms You May Notice

• Check Engine Light is on
• Harsh, erratic, or delayed shifting
• Transmission getting stuck in a single gear (limp mode), often 3rd gear
• Vehicle hesitates or has poor acceleration
• Reduced fuel economy
• Rattling noise from the transmission

Most Likely Causes

1. Failed Transmission Shift Solenoid(s) 🔴 High Probability → Shop Transmission Valve Body This is a well-documented issue on the 6-speed automatic transmission (A6GF1/A6MF1) used in 2012-2013 models. Kia TSB TSBTRA051R1 directly addresses this, advising solenoid replacement for codes like P0743, P0753, P1778, and P2709.
   How to confirm: Scan the TCM for specific solenoid electrical fault codes (e.g., P0750-P0774). A mechanic can test the resistance of the specific solenoid, which should be around 10-11 Ohms at room temperature for the on/off solenoids.
   Typical fix: Replace the faulty individual solenoid or the entire solenoid pack, and often the internal wire harness which can become brittle. This requires removing the transmission oil pan/valve body cover. Use only Kia/Hyundai SP-IV fluid when refilling.
   Est. part cost: $80-$300
2. Failed Input or Output Speed Sensor 🟡 Medium Probability These sensors are common failure points on many automatic transmissions. They provide critical speed data to the TCM for shift control, and failure can cause erratic shifting and limp mode.
   How to confirm: Scan the TCM for codes like P0717 (Input Speed Sensor) or P0721 (Output Speed Sensor). A diagnostic tool can monitor the sensor data in real-time to check for dropouts or erratic readings while driving.
   Typical fix: Replace the faulty sensor. On these models, they are typically located on the outside of the transmission case, making for a relatively easy replacement without dropping the pan.
   Est. part cost: $30-$90
3. Failed Transmission Range Sensor (Inhibitor Switch) 🟡 Medium Probability → Shop Transmission Assembly This switch is mounted externally on top of the transmission and is exposed to heat and the elements, causing it to fail over time and send incorrect gear position data to the TCM.
   How to confirm: Symptoms include the gear indicator on the dash not matching the shifter position, the vehicle not starting in Park/Neutral, or reverse lights not working. A scan may show codes like P0705 or P0706.
   Typical fix: Replace the transmission range sensor. This is typically a straightforward DIY job that requires removing the airbox for access. 🎬 See this walkthrough for locating and replacing the range switch. The new sensor must be correctly aligned before tightening.
   Est. part cost: $45-$70
4. Low or Dirty Transmission Fluid ⚪ Low Probability → Shop Transmission Assembly Neglected maintenance is a common cause of transmission issues. The 6-speed transmission is particularly sensitive to fluid level and quality. Low fluid causes pressure drops, and dirty fluid can clog solenoids and passages.
   How to confirm: Check the transmission fluid level and condition. 2010-2011 4-speeds may have a dipstick. 2012-2013 6-speeds do not have a dipstick; the level must be checked via a fill plug with the vehicle level and at a specific temperature (typically 122-140°F / 50-60°C). Fluid should be bright red, not brown or burnt-smelling.
   Typical fix: Perform a transmission fluid drain and fill using the correct fluid type: SP-III for the 4-speed and SP-IV for the 6-speed. 🎬 Watch: Step-by-step transmission fluid change on a 2012 Kia Soul. If the fluid is low, top it off and inspect for leaks.
   Est. part cost: $50-$150

Rare But Worth Checking

• Damaged Internal Wiring Harness: → Shop Transmission Wiring Harness The internal transmission wiring harness that connects to the solenoids can become brittle from heat cycles and fluid exposure, causing intermittent connections or shorts. It is often recommended to replace this harness when replacing solenoids.
• Faulty Transmission Control Module (TCM): → Shop Transmission Assembly While possible, TCM failure is rare. It should only be considered after all other possibilities, such as sensors, solenoids, fluid, and wiring, have been thoroughly ruled out with proper testing. In a cross-manufacturer example, NHTSA ODI #11080071 describes a scenario where P0700 and P0748 were present, indicating a fault with the transaxle or a failed control module.

Diagnosis Steps

1. Use an OBD-II scanner capable of accessing the Transmission Control Module (TCM) to read the specific transmission fault codes. P0700 is just the messenger.
2. Check the transmission fluid level and condition. For 2012+ models without a dipstick, this must be done from the side fill plug with the engine running and the transmission at operating temperature (122-140°F / 50-60°C).
3. Based on the specific codes found, investigate the corresponding component. For solenoid codes (P0750-P0774) on 2012-2013 models, reference TSB TSBTRA051R1.
4. For speed sensor codes (P0717, P0721), inspect the sensor wiring and use a scan tool to monitor its output speed while driving. The reading should be smooth and consistent.
5. For range sensor issues (P0705), verify symptoms (no-start, wrong gear display) and inspect the sensor, its connector, and linkage on top of the transmission.
6. Inspect the main external transmission wiring harness connector for corrosion, moisture, or pushed-out pins.
7. If a solenoid is suspected, a qualified mechanic will drop the transmission pan/cover to access and test the solenoid's resistance with a multimeter before replacing it.
🎬 Watch: How to clean and test the 6-speed transmission solenoids.
8. After repairs, clear all codes from the ECM and TCM and perform a road test, monitoring live data to ensure the problem is resolved.

Parts You'll Likely Need

• Transmission Shift Solenoid (On/Off) (OEM #46313-3B030) — The most common high-probability failure on 2012-2013 models with the 6-speed automatic, as documented by Kia TSBs. This part number corresponds to the SSA/SSB solenoids.
  Trusted brands: Kia (Genuine), Hyundai (Genuine), Rostra
  OEM price range: $40-$80
  Aftermarket price range: $25-$50
• Transmission Range Sensor / Inhibitor Switch (OEM #42700-3B100) — A common failure that causes shifting and starting issues by sending incorrect gear position data.
  Trusted brands: Kia (Genuine), Dorman, Standard Motor Products (SMP)
  OEM price range: $50-$70
  Aftermarket price range: $35-$60
• Transmission Input/Output Speed Sensor (OEM #42620-3B610 (Input), 42621-3B620 (Output)) — Common failure point that provides critical data for shift timing. Failure leads to erratic shifting and limp mode.
  Trusted brands: Kia (Genuine), Mando, Beck/Arnley
  OEM price range: $40-$90
  Aftermarket price range: $25-$60

Related Codes That Often Appear With This One

• P0715-P0723 — These codes point to faults with the input/output speed sensors, a common cause.
• P0730-P0736 — These codes indicate an incorrect gear ratio, which can be caused by slipping clutches or faulty solenoids preventing proper gear engagement.
• P0740-P0774 — This range of codes points directly to electrical faults in the various shift solenoids and the torque converter clutch solenoid. A code in this range is the most likely companion to P0700 on a 2012-2013 model.
• P0705 — This code specifically indicates a fault in the Transmission Range Sensor circuit.

Technical Service Bulletins (TSBs) & Recalls

• A/T Related DTC(s) P0743, P1778, P2709, etc. Inspection: Advises technicians to inspect and replace individual shift solenoids for a list of specific transmission codes rather than replacing the entire transaxle assembly on vehicles with the 6-speed automatic (A6GF1/A6MF1).
• MDPS Flexible Coupling Replacement: Provides the procedure for replacing the flexible steering coupler to resolve a 'knocking' noise from the steering column, a very common issue on the 2010-2013 Soul.
• Catalytic Overheating Protection ECU Logic Update: A safety recall to update engine software to prevent catalytic converter overheating. The recall also includes inspection and potential replacement of the catalytic converter and/or engine if damage is found.

Platform-Specific Known Issues

• A known issue with solenoid failure on the 6-speed automatic transmission (2012-2013 models) is covered by Kia Technical Service Bulletin TSBTRA051R1. This bulletin is critical as it guides technicians to replace the much cheaper individual solenoid rather than up-selling a full transmission replacement.

Mechanic-Grade Diagnostic Values

• A6GF1 On/Off Shift Solenoid (SSA/SSB) Resistance — expected: 10.0 - 11.0 Ohms. Failure: A reading outside this range, or an open/short circuit, indicates a failed solenoid.
• A6GF1 Variable Force Solenoid (VFS) Resistance — expected: 5.1 - 5.3 Ohms. Failure: A reading outside this range indicates a failed solenoid. This applies to the TCC, 3-5-R, 2-6, OD, and UD solenoids.
• Output Speed Sensor Signal (Hall-Effect Type) — expected: Clean square wave signal on an oscilloscope that increases in frequency with vehicle speed.. Failure: A flatline signal, distorted wave, or intermittent dropouts while the vehicle is moving indicates a faulty sensor or wiring issue.

Scan Tool Commands That Help

• Kia GDS / KDS: Resetting Auto T/A Values — This function must be used after replacing the transmission, valve body, solenoids, or TCM to clear the old adaptive learning values. It is found under the 'Option Treatment' menu in the A/T system section.
• Kia GDS / KDS: Relearn Adaptive Values (Drive Cycle) — Immediately after performing the 'Resetting Auto T/A Values' function. This procedure involves a specific drive cycle of gentle acceleration and deceleration to allow the TCM to learn the new components' characteristics and ensure smooth shifting.

Wiring & Ground Locations

• Transmission Control Module (TCM) — Located in the engine bay, under the battery and air cleaner assembly. Removal of the battery, battery tray, and airbox is required for access.. The TCM is the brain of the transmission. Its location makes it susceptible to damage if there is a battery leak. All sensor and solenoid circuits terminate here, making its main connector a key testing point.
• Transmission Range Sensor (Inhibitor Switch) — Mounted externally on the top of the transmission case, where the gear shift cable attaches.. This sensor tells the TCM which gear is selected. A failure here is a common cause of P0705, which triggers P0700. Its external location makes it vulnerable to weather and heat, but also relatively easy to replace.
• Input / Output Speed Sensors — Mounted externally on the transmission case. Their exact position can vary slightly, but they are generally accessible after removing the airbox and other components on top of the transmission.. These sensors provide critical speed data. A failure or intermittent signal from a loose connection can cause limp mode and trigger P0700. Their external location allows for replacement without opening the transmission.
• TCM Solenoid Power Feed Wires — Within the main harness connector at the TCM. On related Kia models, these are often a green and an orange wire.. A short or open on the main power feeds to the TCM for the solenoid circuits can cause multiple solenoid codes and P0700. Testing for battery voltage at these wires (with key on) is a crucial step if multiple solenoid codes are present.

Real Owner Repair Stories

• YouTube channel 'DiagnoseDan' (2012 Kia Soul 2.0L) — No crank, no start. Scan tool showed the gear position was stuck in 'Drive' even though the shifter was physically in 'Park'.
  ❌ Tried (didn't work) The vehicle was previously taken to another shop where the starter and starter relay were replaced with no success.
  ✅ What actually fixed it The P0705 code was present. The mechanic diagnosed and replaced the faulty Transmission Range Sensor (also called inhibitor switch) on top of the transmission, which resolved both the no-start condition and the trouble code.
• NHTSA ODI #11080071 — An owner reported that the check engine light came on and off repeatedly. Diagnostic testing revealed fault codes P0700 and P0748, indicating a fault with the transaxle or a failed transaxle control module.

OEM Part Supersession History

• 46313-3B020 → 46313-3B030 — Updated design or manufacturer change for the On/Off Shift Solenoid (SSA/SSB).
• Older/original internal wire harness → 46307-3B650 — The updated harness is likely made with more durable materials to resist heat and fluid damage, which caused the original harnesses to become brittle and fail.
  Heads up: When replacing solenoids on the A6GF1/A6MF1, it is highly recommended to install this updated harness at the same time to prevent future issues.

Model Year Variations Within This Range

• 2012-2013: These models use the 6-speed A6GF1 transmission which may have a 'Gen 2' valve body design. When sourcing a replacement valve body, it is critical to ensure it is the correct generation for the vehicle, as there are internal differences.

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Steering Coupler Failure 🟠 Medium — Very common. Causes a distinct clicking or knocking sound in the steering column when turning the wheel, especially when stopped. Onset can be as early as 60,000 miles. (Ref: TSB CHA-074)
• Catalytic Converter Failure (1.6L GDI) 🔴 High — Common enough to warrant a safety recall (SC176). High exhaust temperatures can damage the converter, leading to abnormal combustion, piston damage, and potential engine failure or fire. (Ref: NHTSA Recall 18V-907 / Kia Recall SC176)
• Engine Failure (1.6L GDI) 🔴 High — Related to the catalytic converter issue, but also a standalone problem with numerous complaints of engine seizure and connecting rod failure, often occurring between 75,000 and 150,000 miles. (Ref: Kia Recall SC176)
• Brake Light Switch Failure 🟡 Low — A widespread issue across many Kia models of this era, leading to a recall. A faulty switch can cause brake lights to fail, cruise control to not disengage, and prevent the shifter from moving out of Park. (Ref: NHTSA Recall 13V-114)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For purely external and simple electronic components like the Transmission Range Sensor (Inhibitor Switch). A used part from a verified low-mileage donor vehicle can be a cost-effective repair.

Donor-vehicle mileage cap: roughly under 75000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Verify the donor vehicle's mileage from the instrument cluster or a VIN report.
• Inspect the part for physical damage, cracks, or signs of extreme heat exposure.
• Check electrical connector pins for corrosion, moisture, or damage. They should be clean and straight.

OEM-only on this vehicle (don't cheap out):

• Transmission Control Module (TCM) - Used TCMs often have issues and may not be plug-and-play.
• Internal Wiring Harness - This part becomes brittle with heat and age; a used one has limited life. The updated OEM part is superior.
• Shift Solenoids - These are high-wear, high-failure items. New parts have the latest revisions and a full service life. Given the labor to access them, installing used solenoids is a major risk.

Aftermarket brands forum-validated for this vehicle:

• Rostra (Solenoids)
• Mando (Sensors - often an OE supplier to Kia/Hyundai)
• Dorman (Range Sensor)

Brands owners have reported issues with on this vehicle:

• No-name, unbranded solenoid kits sold on marketplace websites. These often have incorrect resistance values or high failure rates, leading to repeat repairs.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0743 — A specific solenoid electrical fault code mentioned in TSB TSBTRA051R1 that often triggers the P0700 master code.
• P0717 — Input Speed Sensor circuit no signal; failure of this sensor provides critical data to the TCM and can cause the P0700 code.
• P0721 — Output Speed Sensor range/performance; another common sensor failure that leads to erratic shifting and TCM fault reporting.
• P0705 — Transmission Range Sensor Circuit malfunction (PRNDL input); related to the inhibitor switch failure common on this vehicle.
• P1778 — An additional transmission-related DTC listed in TSB TSBTRA051R1 specifically for the 6-speed automatic models.
• P2709 — Shift Solenoid F Electrical code; identified in Kia technical bulletins as a reason for solenoid replacement on 2012-2013 models.

Frequently Asked Questions