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Hyundai P0731

AT-012H to revise the AD/ADa model years. Description: This TSB provides a procedure to diagnose and repair a transaxle for the following Incorrect Ratio DTC (transaxle clutch slip

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Hyundai dealer or qualified Hyundai service facility for diagnosis under TSB 20-AT-001H.
Confidence95%

Quick answer

P0731 is identified in Hyundai TSB 20-AT-001H as “Gear 1 incorrect ratio” (P073100). The bulletin concerns transaxle clutch slipping by more than 200 rpm while in gear.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does P0731 mean?

P0731 is identified in Hyundai TSB 20-AT-001H as “Gear 1 incorrect ratio” (P073100). The bulletin concerns transaxle clutch slipping by more than 200 rpm while in gear.

2. Technical explanation

Verified NHTSA-published Hyundai TSB 20-AT-001H describes P0731 as an incorrect-ratio diagnostic trouble code for first gear. The bulletin provides a procedure to diagnose and repair the transaxle when this and certain other incorrect-ratio codes are present. It supersedes Hyundai TSB 19-AT-012H to revise AD/ADa model-year information.

3. What system is affected?

Transaxle.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The verified bulletin identifies transaxle clutch slipping more than 200 rpm while in gear as the condition associated with the incorrect-ratio DTC group.
  • No additional driver-visible symptoms are established by the supplied verified evidence.

6. Possible causes

  • The supplied verified evidence associates P0731 with a first-gear incorrect ratio and transaxle clutch slipping more than 200 rpm while in gear.
  • Specific underlying component causes are not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis using the procedure in Hyundai TSB 20-AT-001H or by a qualified Hyundai service facility.
  • Do not attempt high-voltage or transaxle repair procedures yourself.

10. Step-by-step troubleshooting

  1. Confirm the stored code is P0731/P073100.
  2. Have a qualified technician follow Hyundai TSB 20-AT-001H, which provides a transaxle diagnostic and repair procedure for this incorrect-ratio DTC group.

11. When to contact service

Contact a Hyundai dealer or qualified Hyundai service facility for diagnosis under TSB 20-AT-001H.

12. What the service center may check

  • Retrieve and confirm P0731/P073100.
  • Diagnose the transaxle using Hyundai TSB 20-AT-001H procedures.
  • Evaluate the incorrect-ratio condition described by the bulletin, including the stated transaxle clutch-slip criterion of more than 200 rpm while in gear.

13. Possible repair or resolution

  • The verified bulletin states that it provides procedures to diagnose and repair the transaxle. The specific repair outcome is not established by the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Hyundai TSB 20-AT-001H, published through NHTSA as Manufacturer Communication MC-10170899 (2020-01-02). It supersedes TSB 19-AT-012H and addresses P0731, P0732, P0733, P0734, P0735, P0736, P0729, P076F, and P0730.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication MC-10170899, Hyundai TSB 20-AT-001H: https://static.nhtsa.gov/odi/tsbs/2020/MC-10170899-0001.pdf. Supplied applicability records list US-market 2016–2020 Hyundai Kona and 2016–2020 Hyundai Sonata vehicles; the bulletin itself should be consulted to confirm exact vehicle applicability.

19. Frequently asked questions

What does P0731 mean in this Hyundai bulletin?

Hyundai TSB 20-AT-001H identifies P0731/P073100 as “Gear 1 incorrect ratio.”

What condition does the bulletin associate with P0731?

The bulletin describes the incorrect-ratio DTC group as involving transaxle clutch slipping more than 200 rpm while in gear.

Is P0731 covered by a Hyundai service bulletin?

Yes. Hyundai TSB 20-AT-001H provides a diagnostic and repair procedure for P0731 and other listed incorrect-ratio codes.

Can I continue driving or charging?

Driving and charging suitability are not yet established by the supplied verified evidence.

20. Sources & verification

ReferenceVerified
Hyundai P0731: AT-012H to revise the AD/ADa model years. Description:… | EV Diagnostics