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Nissan C1A17-49

(CONTROL UNIT (INTERNAL ELECTRONIC ERROR)) Figure 1 ACTION 1. Install the new Distance Sensor. 2. Add a foam strip to th e new Distance Sensor. 3. Perform Radar Alignment. IMPORTAN

Common search variants: C1A1749 · C1A17 49 · C1A17_49 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Nissan dealer or qualified technician. Nissan states its bulletins are intended for qualified technicians rather than do-it-yourself repairers.
Confidence95%

Quick answer

For a 2018 Nissan LEAF (ZE1), DTC C1A17-49 is identified by Nissan as “CONTROL UNIT (INTERNAL ELECTRONIC ERROR).” Nissan bulletin NTB18-057c applies when Malfunction and AEB warning lights are on with this code and specifies distance-sensor replacement, addition of a foam strip, and radar alignment by qualified technicians.

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1. What does C1A17-49 mean?

For a 2018 Nissan LEAF (ZE1), DTC C1A17-49 is identified by Nissan as “CONTROL UNIT (INTERNAL ELECTRONIC ERROR).” Nissan bulletin NTB18-057c applies when Malfunction and AEB warning lights are on with this code and specifies distance-sensor replacement, addition of a foam strip, and radar alignment by qualified technicians.

2. Technical explanation

Verified Nissan bulletin evidence associates C1A17-49 with an internal electronic error of the control unit. In NTB18-057c, Nissan describes a specific 2018 LEAF condition where Malfunction and Automatic Emergency Braking (AEB) warning lights are on and C1A17-49 may be stored, together with C1B84-00. The bulletin’s prescribed repair is to install a new Distance Sensor, add a foam strip to the new sensor, and perform radar alignment. Nissan states that the full service procedure must be followed.

3. What system is affected?

Distance Sensor / radar-based Automatic Emergency Braking (AEB) system. The database diagnostic record does not provide a broader system name.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • For the 2018 Nissan LEAF condition covered by NTB18-057c: Malfunction warning light on.
  • For the 2018 Nissan LEAF condition covered by NTB18-057c: Automatic Emergency Braking (AEB) warning light on.

6. Possible causes

  • Nissan identifies C1A17-49 as “CONTROL UNIT (INTERNAL ELECTRONIC ERROR).”
  • Further underlying cause detail 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 diagnosis by a qualified Nissan technician.
  • Provide the technician with DTC C1A17-49 and the applicable Nissan bulletin reference NTB18-057c for a 2018 LEAF.
  • Do not attempt radar-sensor replacement or radar alignment without the required service procedure and equipment.

10. Step-by-step troubleshooting

  1. For covered Nissan models in NTB21-106, if C1A17-49 is stored in LASER/RADAR as “PAST,” Nissan instructs technicians to erase the DTC and not replace parts.
  2. For covered Nissan models in NTB21-106, if C1A17-49 is stored in LASER/RADAR as “CURRENT,” Nissan directs technicians to the applicable Electronic Service Manual (ESM).
  3. For the 2018 LEAF condition in NTB18-057c, Nissan requires confirmation of the warning-light condition and relevant DTCs before following its service procedure.

11. When to contact service

Contact a Nissan dealer or qualified technician. Nissan states its bulletins are intended for qualified technicians rather than do-it-yourself repairers.

12. What the service center may check

  • Read the LASER/RADAR DTC status, including whether C1A17-49 is recorded as PAST or CURRENT, where NTB21-106 applies.
  • For a 2018 LEAF, confirm whether Malfunction and AEB warning lights are on and whether C1A17-49 and C1B84-00 are present, as described in NTB18-057c.
  • Follow the applicable Nissan Electronic Service Manual or the complete bulletin procedure.

13. Possible repair or resolution

  • For the 2018 LEAF condition described in NTB18-057c: install a new Distance Sensor.
  • For the 2018 LEAF condition described in NTB18-057c: add a foam strip to the new Distance Sensor.
  • For the 2018 LEAF condition described in NTB18-057c: perform radar alignment.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NTB18-057c, dated February 3, 2021: 2018 LEAF (ZE1); Malfunction and AEB warning lights on. Covers C1A17-49 and C1B84-00. NHTSA communication 10188306: https://static.nhtsa.gov/odi/tsbs/2021/MC-10188306-0001.pdf
  • NTB18-057b, dated January 18, 2019: 2018 LEAF (ZE1); earlier version of the same bulletin. NHTSA communication 10153009: https://static.nhtsa.gov/odi/tsbs/2019/MC-10153009-9999.pdf
  • NTB21-106, dated November 15, 2021: provides PAST versus CURRENT DTC handling for listed Nissan vehicles, but the supplied evidence does not list the LEAF among its applicable vehicles. NHTSA communication 10206321: https://static.nhtsa.gov/odi/tsbs/2021/MC-10206321-0001.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Nissan bulletin for the 2018 LEAF: NTB18-057c, https://static.nhtsa.gov/odi/tsbs/2021/MC-10188306-0001.pdf

19. Frequently asked questions

What does Nissan code C1A17-49 mean?

Nissan identifies C1A17-49 as “CONTROL UNIT (INTERNAL ELECTRONIC ERROR).”

Which LEAF is covered by Nissan bulletin NTB18-057c?

The bulletin identifies the applied vehicle as the 2018 Nissan LEAF (ZE1).

What repair does NTB18-057c specify?

The bulletin specifies installing a new Distance Sensor, adding a foam strip to the new sensor, and performing radar alignment. Nissan requires the complete service procedure to be followed.

Is this a recall?

Not yet established by verified evidence.

Is it safe to drive or charge with C1A17-49?

Not yet established by verified evidence.

20. Sources & verification

Verified
Nissan C1A17-49: (CONTROL UNIT (INTERNAL ELECTRONIC ERROR)) Figure 1… | EV Diagnostics