EV Diagnostics
Verified EV diagnostic knowledge page

Hyundai C1112

safe relay fault First erase DTC, then check wiring and connector at ECU. C1705 ECU hardware error C1604 ECU over/discharge error C2413 ECU hardware error C2400 Motor signal error

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Hyundai dealer or qualified service provider for diagnosis of the MDPS/C-MDPS steering system. The supplied evidence does not establish whether immediate service is required.
Confidence95%

Quick answer

For Hyundai vehicles covered by the supplied communications, C1112 is identified as a torque sensor voltage error in the MDPS/C-MDPS steering system. The documented procedure is to check wiring and connector condition between the torque sensor and ECU; if the DTC returns, the applicable bulletin directs replacement of the MDPS/C-MDPS ECU or Power Pack assembly, depending on the bulletin/version.

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

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

#hyundai #i20elite Steering hard problem Fault code #c1112 Sensor source voltage successfully eps RAll Auto Electronics

Videos are supporting material and never override OEM or regulator evidence.

1. What does C1112 mean?

For Hyundai vehicles covered by the supplied communications, C1112 is identified as a torque sensor voltage error in the MDPS/C-MDPS steering system. The documented procedure is to check wiring and connector condition between the torque sensor and ECU; if the DTC returns, the applicable bulletin directs replacement of the MDPS/C-MDPS ECU or Power Pack assembly, depending on the bulletin/version.

2. Technical explanation

The supplied official Hyundai communications describe C1112 as “Torque sensor voltage error.” This is steering-system diagnostic information, not an EV high-voltage battery or charging-system diagnosis. The canonical record contains conflicting wording (“safe relay fault”), but the detailed official TSB evidence consistently identifies C1112 as a torque sensor voltage error and provides the diagnostic direction summarized here.

3. What system is affected?

MDPS/C-MDPS electric power steering system, including the torque sensor, related wiring/connectors, and ECU/Power Pack assembly.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

Not yet established by verified evidence.

6. Possible causes

  • Torque sensor voltage error, as identified in the official Hyundai communications.
  • Wiring or connector condition between the torque sensor and ECU, which the bulletins instruct technicians to check.
  • If the DTC returns after the documented checks, an MDPS/C-MDPS ECU or Power Pack assembly issue is addressed by the applicable bulletin's replacement instruction.

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.
  • Do not attempt ECU, steering-system, or electrical repairs yourself.
  • Provide the stored code C1112 and any accompanying DTCs to the service provider.

10. Step-by-step troubleshooting

  1. The official Hyundai procedure instructs technicians to check wiring and connector condition between the torque sensor and ECU.
  2. The supplied 2020 bulletins state that, if C1112 returns, replace the C-MDPS ECU or Power Pack assembly.
  3. The supplied 2019 bulletin states that, if C1112 returns, replace the MDPS ECU.
  4. No further owner-level troubleshooting is established by the verified evidence.

11. When to contact service

Contact a Hyundai dealer or qualified service provider for diagnosis of the MDPS/C-MDPS steering system. The supplied evidence does not establish whether immediate service is required.

12. What the service center may check

  • Confirm C1112 using appropriate diagnostic equipment.
  • Inspect wiring and connector condition between the torque sensor and ECU, as directed by the official Hyundai communications.
  • Determine whether the DTC returns after the documented inspection/repair process.
  • Apply the ECU or Power Pack replacement direction specified by the applicable bulletin and vehicle configuration if the DTC returns.

13. Possible repair or resolution

  • For the 2019 communication supplied, Hyundai directs replacement of the MDPS ECU if C1112 returns after wiring/connector checks.
  • For the supplied 2020 communications, Hyundai directs replacement of the C-MDPS ECU or Power Pack assembly if C1112 returns after wiring/connector checks.
  • Exact repair applicability for a specific vehicle is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Hyundai TSB 19-ST-001H, published April 22, 2019 (NHTSA MC-10160106): identifies C1112 as torque sensor voltage error; instructs inspection of wiring/connectors between torque sensor and ECU, followed by MDPS ECU replacement if the DTC returns.
  • Hyundai TSB 20-ST-001H, published January 3, 2020 (NHTSA MC-10170896): identifies C1112 as torque sensor voltage error; instructs inspection of wiring/connectors between torque sensor and ECU, followed by MDPS ECU or Power Pack assembly replacement if the DTC returns.
  • Hyundai TSB 20-ST-001H-1, published August 10, 2020 (NHTSA MC-10179244): same documented C1112 diagnostic direction.
  • Hyundai TSB 20-ST-001H-2, published September 9, 2020 (NHTSA MC-10180981): same documented C1112 diagnostic direction.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Verified applicability records list US-market Hyundai Kona model years 2016–2021 and Hyundai Sonata model years 2016–2021, with overlapping year ranges in the supplied database. The supplied communications themselves include MDPS/C-MDPS diagnostic guidance; exact applicability to an individual vehicle should be confirmed by Hyundai using its VIN and the applicable bulletin.

19. Frequently asked questions

What does Hyundai C1112 mean?

The supplied official Hyundai communications identify C1112 as a torque sensor voltage error.

Is C1112 a charging or high-voltage battery code?

The supplied evidence places C1112 in Hyundai MDPS/C-MDPS steering-system diagnostic guidance. It does not establish a charging or high-voltage battery fault.

What does Hyundai's documented procedure say to check?

It directs technicians to check wiring and connector condition between the torque sensor and ECU.

What if C1112 returns?

The supplied 2019 bulletin directs MDPS ECU replacement. The supplied 2020 bulletins direct replacement of the C-MDPS ECU or Power Pack assembly. Applicability depends on the relevant vehicle and bulletin.

Can I drive with C1112?

Not yet established by verified evidence.

20. Sources & verification

Verified
Hyundai C1112: safe relay fault First erase DTC, then check wiring and… | EV Diagnostics