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2016 Optima LX - Hard shifts and P0700 code after long drive

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Mike T. · rep 0 · May 25, 2:06 AM · 1 replies · solved · Question

Vehicle: 2016 Kia Optima LX 2.4L

Hey guys, I'm having some trouble with my 2016 Kia Optima LX (2.4L engine). After a longer drive yesterday, I noticed the transmission started shifting really hard, especially between 2nd and 3rd gear. It feels like a jolt.

This morning, the check engine light came on. I scanned it and got a P0700 code, which points to a Transmission Control System Malfunction. I'm worried this might be a serious transmission issue. The car has about 90,000 miles.

Has anyone experienced this with their Optima? What could be causing this, and what should I check before taking it to a transmission shop? I've heard about transmission fluid levels or solenoids, but I'm not sure where to start.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:06 AM

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ClearTheCode admin answer: A P0700 code is a generic code indicating that the Transmission Control Module (TCM) has detected a fault and has illuminated the Check Engine Light. It usually means there are more specific transmission-related fault codes stored in the TCM that an advanced scanner can read.

Here's what to investigate:

  1. Check Transmission Fluid Level and Condition: This is the first and easiest step. Refer to your owner's manual for the correct procedure to check your transmission fluid (often done with the engine warm and running, in Park). Low fluid can cause hard shifting and transmission damage. Also, note the fluid's color and smell – dark, burnt-smelling fluid indicates a serious internal issue.
  2. Advanced Scan for Specific Codes: While your basic OBD-II scanner shows P0700, a more advanced scanner (often available at independent shops) can communicate directly with the TCM and pull specific codes (e.g., P07XX series codes like P0731, P0740, P0750, etc.). These codes will pinpoint the exact nature of the transmission fault, such as a faulty shift solenoid, torque converter issue, or sensor problem.
  3. Inspect Wiring and Connectors: Look for any visible damage, corrosion, or loose connections to the transmission sensors and solenoids. Sometimes, a simple wiring issue can cause communication problems with the TCM.
  4. Transmission Solenoids: Faulty shift solenoids are a common cause of hard shifting. These are controlled by the TCM and direct fluid flow within the transmission. If one is sticking or failing, it can lead to erratic shifts.

When to See a Shop:

  • Immediately if the transmission fluid is low, dark, or smells burnt. Driving with low or degraded fluid can cause severe damage.
  • If you cannot access specific TCM codes, an independent transmission shop or a Kia dealership will have the necessary diagnostic tools.
  • If the issue persists after checking fluid levels and basic visual inspections. Hard shifts can quickly lead to more significant internal transmission damage if not addressed promptly.
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