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Hyundai P073400

2012~17 2018~ 2011 2012~17 2011~16 2017~ 2013~14 2013~17 2018~ 2018~ 2007~12 2013~18 2013~19 2020~ 2019~ 2011~14 2015~

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because Hyundai issued transaxle diagnostic-and-repair procedures for P073400. Whether immediate service is required is not yet established by verified evidence.
Confidence95%

Quick answer

P073400 is identified in the supplied Hyundai manufacturer communications as “Gear 4 incorrect ratio.” The bulletin describes this as transaxle clutch slipping more than 200 rpm while in gear. Vehicle-specific applicability and the safety of driving or charging are not yet established by verified evidence supplied here.

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 P073400 mean?

P073400 is identified in the supplied Hyundai manufacturer communications as “Gear 4 incorrect ratio.” The bulletin describes this as transaxle clutch slipping more than 200 rpm while in gear. Vehicle-specific applicability and the safety of driving or charging are not yet established by verified evidence supplied here.

2. Technical explanation

Hyundai TSB 19-AT-012H and its revision, 20-AT-001H, list P073400 among Incorrect Ratio DTCs. In those bulletins, P073400 corresponds to Gear 4 incorrect ratio. The stated diagnostic context is transaxle clutch slipping more than 200 rpm in gear. The supplied evidence does not establish a component-level root cause, an EV high-voltage-system fault, or a specific repair outcome for an individual vehicle.

3. What system is affected?

Transaxle, based on the official Hyundai bulletin description.

4. How serious is this code?

Unknown. The supplied verified evidence does not assign a severity level.

5. Symptoms you may notice

  • A stored P073400 diagnostic trouble code may be present.
  • The official bulletin describes the code category as transaxle clutch slipping more than 200 rpm in gear.

6. Possible causes

  • An individual root cause is not yet established by verified evidence. The supplied Hyundai bulletins identify P073400 as a Gear 4 incorrect-ratio code within a transaxle diagnostic procedure.

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 by a Hyundai-qualified service provider.
  • Provide the technician with the stored code P073400 and the applicable Hyundai bulletin references.

10. Step-by-step troubleshooting

  1. Hyundai TSB 19-AT-012H provides a procedure to diagnose and repair the transaxle for P073400 and other listed incorrect-ratio DTCs.
  2. Hyundai TSB 20-AT-001H revises 19-AT-012H for AD/ADa model years, according to the supplied NHTSA communication summary.
  3. Do not infer a specific failed part from this code alone; the supplied evidence does not establish one.

11. When to contact service

Service is appropriate because Hyundai issued transaxle diagnostic-and-repair procedures for P073400. Whether immediate service is required is not yet established by verified evidence.

12. What the service center may check

  • Confirm the exact vehicle model, model year, market, powertrain, and stored DTC information before applying a bulletin.
  • Use the Hyundai transaxle diagnostic procedure in TSB 19-AT-012H or revised TSB 20-AT-001H when applicable.
  • Evaluate the P073400 incorrect-ratio condition under the bulletin procedure rather than selecting a repair based on the code alone.

13. Possible repair or resolution

  • A specific repair is not yet established by verified evidence. The supplied official bulletins state that they provide a procedure to diagnose and repair the transaxle for P073400.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Hyundai TSB 19-AT-012H, published through NHTSA as manufacturer communication MC-10163279 on 2019-06-04. It covers transaxle diagnosis and repair for incorrect-ratio DTCs including P073400.
  • Hyundai TSB 20-AT-001H, published through NHTSA as manufacturer communication MC-10170899 on 2020-01-02. It revises 19-AT-012H for AD/ADa model years and includes P073400.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official sources supplied: NHTSA-hosted Hyundai manufacturer communications for TSB 19-AT-012H (https://static.nhtsa.gov/odi/tsbs/2019/MC-10163279-9999.pdf) and TSB 20-AT-001H (https://static.nhtsa.gov/odi/tsbs/2020/MC-10170899-0001.pdf). Supplied applicability records list Hyundai Kona and Sonata in the US for 2016–2019 and 2016–2020, but the supplied bulletin excerpts do not independently establish exact model, year, powertrain, or VIN applicability for P073400. Confirm applicability with Hyundai using the vehicle VIN.

19. Frequently asked questions

What does Hyundai code P073400 mean?

The supplied Hyundai bulletins define P073400 as Gear 4 incorrect ratio.

What does the bulletin say about the condition?

It describes the incorrect-ratio DTC category as transaxle clutch slipping more than 200 rpm in gear.

Can I drive with P073400?

Not yet established by verified evidence.

Does P073400 affect EV charging?

Not yet established by verified evidence.

Is there a Hyundai service bulletin for P073400?

Yes. The supplied evidence identifies Hyundai TSB 19-AT-012H and revision 20-AT-001H as transaxle diagnosis-and-repair procedures covering P073400.

20. Sources & verification

Verified
Hyundai P073400: 2012~17 2018~ 2011 2012~17 2011~16 2017~ 2013~14… | EV Diagnostics