Hyundai C1612
MDPS ECU. Replace the C- MDPS motor. Replace torque sensor cable first. If DTCs persist, then replace the column & housing assy. Check DTC(s) and Wiring at HECU / C-MDPS / EMS • Ch
Quick answer
For a 2016–2017 Hyundai Sonata in the US, DTC C1612 is listed in Hyundai service communications as a connectors/wiring-related C-MDPS diagnostic code. The documented process includes checking DTCs and wiring at the HECU, C-MDPS, and EMS; inspecting connectors for poor connection and corrosion; replacing the torque sensor cable first; and, if DTCs persist, replacing the column and housing assembly. The communication also references C-MDPS motor replacement in its repair guidance.
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1. What does C1612 mean?
For a 2016–2017 Hyundai Sonata in the US, DTC C1612 is listed in Hyundai service communications as a connectors/wiring-related C-MDPS diagnostic code. The documented process includes checking DTCs and wiring at the HECU, C-MDPS, and EMS; inspecting connectors for poor connection and corrosion; replacing the torque sensor cable first; and, if DTCs persist, replacing the column and housing assembly. The communication also references C-MDPS motor replacement in its repair guidance.
2. Technical explanation
C1612 is identified in the supplied Hyundai/NHTSA manufacturer communications within the connectors/wiring-related C-MDPS code group. C-MDPS refers to the vehicle’s column-mounted motor-driven power steering system. The supplied evidence directs technicians to check stored DTCs and wiring at the HECU, C-MDPS, and EMS, including connector condition. It specifically states to replace the torque sensor cable first; if DTCs persist, replace the column and housing assembly. The communication also includes replacement of the C-MDPS motor in its stated repair guidance. The exact fault logic for C1612 is not yet established by verified evidence.
3. What system is affected?
C-MDPS / column-mounted motor-driven power steering system. The documented diagnostic checks also reference the HECU and EMS.
4. How serious is this code?
Not yet established by verified evidence. Because C1612 concerns the C-MDPS steering system, have the vehicle assessed by a qualified Hyundai service facility.
5. Symptoms you may notice
- Warning lamp illumination is referenced in the Hyundai manufacturer communication for the related C-MDPS diagnostic procedure.
- Other C1612-specific symptoms are not yet established by verified evidence.
6. Possible causes
- Connector poor connection at the HECU, C-MDPS, or EMS is included in the documented inspection guidance.
- Connector corrosion at the HECU, C-MDPS, or EMS is included in the documented inspection guidance.
- Torque sensor cable concern is supported by the instruction to replace the torque sensor cable first.
- A persistent DTC after the torque sensor cable replacement is addressed by replacement of the column and housing assembly.
- The exact underlying cause of an individual C1612 event is 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 qualified diagnosis using the Hyundai C-MDPS procedure.
- Report any warning lamp illumination and any steering-related concern to the service facility.
- Do not attempt C-MDPS component, steering-column, wiring, or connector repairs unless qualified to perform them.
10. Step-by-step troubleshooting
- Check DTCs and wiring at the HECU, C-MDPS, and EMS.
- Check connectors for poor connection.
- Check connectors for corrosion.
- Follow the documented sequence: replace the torque sensor cable first; if DTCs persist, replace the column and housing assembly.
- The supplied evidence also references replacement of the C-MDPS motor in the communication’s repair guidance.
11. When to contact service
Contact a qualified Hyundai service facility for diagnosis and repair of C1612 using the applicable Hyundai C-MDPS service procedure.
12. What the service center may check
- Retrieve and review DTCs.
- Inspect wiring at the HECU, C-MDPS, and EMS.
- Inspect connectors for poor connection.
- Inspect connectors for corrosion.
- Evaluate the torque sensor cable according to the documented repair sequence.
- Confirm whether DTCs persist after the torque sensor cable replacement.
13. Possible repair or resolution
- Replace the torque sensor cable first.
- If DTCs persist, replace the column and housing assembly.
- The supplied Hyundai communication also includes C-MDPS motor replacement in its repair guidance.
- Final repair selection for a specific vehicle is not yet established by verified evidence and requires diagnosis.
14. Affected vehicles
- Hyundai Sonata · 2016–2017 · US
15. Related TSBs / service bulletins
- Hyundai manufacturer communication 23-ST-003H, published April 10, 2023. NHTSA document: https://static.nhtsa.gov/odi/tsbs/2023/MC-10235349-0001.pdf
- Hyundai manufacturer communication 22-ST-001H, published January 6, 2022. NHTSA document: https://static.nhtsa.gov/odi/tsbs/2022/MC-10207815-0001.pdf
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
The supplied official evidence consists of Hyundai manufacturer communications filed with NHTSA: 23-ST-003H and 22-ST-001H. Applicability supplied for this record is Hyundai Sonata, model years 2016–2017, US region.
19. Frequently asked questions
What does Hyundai C1612 apply to in the supplied evidence?
It is listed as a connectors/wiring-related diagnostic code for the C-MDPS system in Hyundai manufacturer communications.
What should be inspected for C1612?
The documented procedure calls for checking DTCs and wiring at the HECU, C-MDPS, and EMS, and checking connectors for poor connection and corrosion.
What repair sequence is documented?
Replace the torque sensor cable first. If DTCs persist, replace the column and housing assembly. The communications also reference C-MDPS motor replacement in their repair guidance.
Is C1612 confirmed to be a recall?
Not yet established by verified evidence.
Is it safe to drive with C1612?
Not yet established by verified evidence.