Engine-Codes - Kia - P0731 KIA

P0731 KIA Code - First Gear Incorrect Ratio

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

|P0731 KIA code possible causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit

|How is the P0731 KIA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0731 KIA code tech notes

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

|What is the cost to diagnose the P0731 KIA code

Labor: 1.0

The cost to diagnose the P0731 KIA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0731 KIA code detected?

P0731 is detected when A/T cannot be shifted to the 1st gear position even if electrical circuit is good.

|What are P0731 KIA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Incorrect transmission shifting

|What is P0731 KIA code meaning?

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

|Need more information with the P0731 KIA code?

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|Need help with a P0731 KIA code?

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