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Hyundai C1290

safe relay fault First erase DTC, then check wiring and conn

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is recommended if C1290 returns after the documented erase-and-wiring/connector check. The supplied evidence does not establish an urgency classification.
Confidence95%

Quick answer

For Hyundai C1290, verified Hyundai/NHTSA service communications identify it as a torque sensor signal error in MDPS/C-MDPS contexts. The documented process is to erase the DTC, check wiring and connector condition, and replace the column & housing assembly if the DTC returns. Driving and charging status are not yet established by verified evidence.

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 C1290 mean?

For Hyundai C1290, verified Hyundai/NHTSA service communications identify it as a torque sensor signal error in MDPS/C-MDPS contexts. The documented process is to erase the DTC, check wiring and connector condition, and replace the column & housing assembly if the DTC returns. Driving and charging status are not yet established by verified evidence.

2. Technical explanation

The supplied diagnostic record’s canonical wording differs from the official Hyundai service-bulletin evidence. Multiple Hyundai manufacturer communications filed with NHTSA identify C1290 as “torque sensor signal error,” not a safe-relay fault. Hyundai’s documented repair flow calls for erasing the DTC first, checking wiring and connector condition, and replacing the column & housing assembly if C1290 returns. Separate Hyundai bulletins direct inspection of Torque Angle Sensor (TAS) wiring for damage, pushed-back terminals, or improper connection when C1290 is present; where harness issues are found, they specify replacement of the full C-MDPS assembly in the applicable bulletin context.

3. What system is affected?

Motor-Driven Power Steering (MDPS/C-MDPS), including the torque sensor/Torque Angle Sensor wiring and column & housing assembly.

4. How serious is this code?

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

5. Symptoms you may notice

  • A warning lamp illuminated with DTCs present is referenced in Hyundai TSB 22-ST-001H; specific symptoms for C1290 alone are not yet established by verified evidence.

6. Possible causes

  • Torque sensor signal error, as identified in Hyundai service communications.
  • Damage, pushed-back terminals, or improper connection in Torque Angle Sensor wiring, where applicable under Hyundai’s TAS wiring-inspection guidance.
  • Other 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 by a qualified Hyundai service provider or similarly qualified technician.
  • Provide the stored DTC and any accompanying DTCs to the service provider.
  • Do not perform electrical or steering-system disassembly based on this page.

10. Step-by-step troubleshooting

  1. Hyundai’s documented sequence for C1290 is to erase the DTC, then check wiring and connector condition.
  2. If C1290 returns, Hyundai’s documented recommendation in the cited communications is replacement of the column & housing assembly.
  3. For applicable C-MDPS/TAS configurations, Hyundai directs inspection of TAS wiring for damage, pushed-back terminals, or improper connection.

11. When to contact service

Service is recommended if C1290 returns after the documented erase-and-wiring/connector check. The supplied evidence does not establish an urgency classification.

12. What the service center may check

  • Read stored DTCs and note accompanying codes.
  • Erase C1290 and re-check whether it returns, following Hyundai’s documented diagnostic flow.
  • Inspect applicable wiring and connectors for condition.
  • For applicable C-MDPS/TAS systems, inspect TAS-side and ECU-side wiring for damage, pushed-back terminals, or improper connection.

13. Possible repair or resolution

  • If C1290 returns after the documented checks, Hyundai service communications specify replacement of the column & housing assembly.
  • In the cited C-MDPS/TAS wiring guidance, if harness issues are found, replace the full C-MDPS assembly (part number beginning 56310) in the applicable bulletin context.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Hyundai TSB 20-ST-001H, published January 3, 2020: identifies C1290 as torque sensor signal error and specifies erase DTC, check wiring/connectors, and replace column & housing assembly if the code returns. https://static.nhtsa.gov/odi/tsbs/2020/MC-10170896-0001.pdf
  • Hyundai TSB 19-ST-001H, published April 22, 2019: provides the same C1290 diagnostic direction. https://static.nhtsa.gov/odi/tsbs/2019/MC-10160106-9999.pdf
  • Hyundai TSB 20-ST-001H-1, published August 10, 2020: directs TAS wiring inspection in the presence of C1290. https://static.nhtsa.gov/odi/tsbs/2020/MC-10179244-0001.pdf
  • Hyundai TSB 20-ST-001H-2, published September 9, 2020: directs TAS wiring inspection in the presence of C1290. https://static.nhtsa.gov/odi/tsbs/2020/MC-10180981-0001.pdf
  • Hyundai TSB 22-ST-001H, published January 6, 2022: includes C1290 in an R-MDPS diagnostic repair flowchart. https://static.nhtsa.gov/odi/tsbs/2022/MC-10207815-0001.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability records list Hyundai Kona model years 2016–2021 and Hyundai Sonata model years 2016–2021 in the US, with overlapping year ranges. The cited Hyundai communications contain model- and system-specific applicability details; a service provider should confirm applicability by vehicle configuration and VIN.

19. Frequently asked questions

What does Hyundai C1290 mean?

The cited Hyundai service communications identify C1290 as a torque sensor signal error.

What does Hyundai recommend for C1290?

Hyundai directs technicians to erase the DTC, check wiring and connector condition, and replace the column & housing assembly if the DTC returns.

Is C1290 a safe relay fault?

Not according to the supplied Hyundai/NHTSA bulletin evidence. That evidence identifies C1290 as a torque sensor signal error. The supplied diagnostic record’s canonical wording is inconsistent with those official communications.

Can I keep driving with C1290?

Not yet established by verified evidence.

Does C1290 affect charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Hyundai C1290: safe relay fault First erase DTC, then check wiring and… | EV Diagnostics