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Chevrolet P0C57

Drive Motor 2 Position Sensor Circuit 1 Low Voltage DTC P0C58: Drive Motor 2 Position Sensor Circuit 1 High Voltage DTC P0C61: Drive Motor 2 Position Sensor Circuit 2 Low Voltage D

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is recommended because the verified manufacturer communication contains a specific harness replacement and verification procedure. Whether service is immediately required is not established by the supplied evidence.
Confidence95%

Quick answer

For a 2016–2018 Chevrolet Volt (US), P0C57 is identified as Drive Motor 2 Position Sensor Circuit 1 Low Voltage. Verified GM bulletin 19NA211 addresses this code family and specifies replacement of the transmission wiring harness, followed by Diagnostic Repair Verification.

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 P0C57 mean?

For a 2016–2018 Chevrolet Volt (US), P0C57 is identified as Drive Motor 2 Position Sensor Circuit 1 Low Voltage. Verified GM bulletin 19NA211 addresses this code family and specifies replacement of the transmission wiring harness, followed by Diagnostic Repair Verification.

2. Technical explanation

The supplied diagnostic record identifies P0C57 as a Drive Motor 2 Position Sensor Circuit 1 Low Voltage DTC. The official NHTSA-hosted GM manufacturer communication 19NA211 also lists P0C58 (Circuit 1 High Voltage), P0C61 (Circuit 2 Low Voltage), and P0C62 (Circuit 2 High Voltage) as additional keywords. Its documented repair direction is to replace the transmission wiring harness with part number 24285318, HARNESS, A/TRNS WRG SHF POSN SWITCH, and perform Diagnostic Repair Verification in GM Service Information (SI).

3. What system is affected?

Drive Motor 2 position-sensor circuit / transmission wiring harness, based on the diagnostic title and bulletin repair procedure.

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

  • The verified bulletin directs replacement of the transmission wiring harness. The supplied evidence does not establish a more specific failure mechanism or root cause.

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 Chevrolet/GM service provider.
  • Provide the stored DTC P0C57 and reference GM bulletin 19NA211 when scheduling service.
  • Do not perform high-voltage or transmission wiring repairs without appropriate OEM procedures and qualified training.

10. Step-by-step troubleshooting

  1. Confirm the vehicle is a US-market 2016–2018 Chevrolet Volt, the verified applicability supplied for this diagnostic.
  2. Have a qualified technician diagnose the stored DTC using GM Service Information.
  3. If the bulletin procedure applies, GM bulletin 19NA211 directs replacement of the transmission wiring harness and completion of Diagnostic Repair Verification.

11. When to contact service

Service is recommended because the verified manufacturer communication contains a specific harness replacement and verification procedure. Whether service is immediately required is not established by the supplied evidence.

12. What the service center may check

  • Confirm the stored code and vehicle applicability in GM diagnostic procedures.
  • Follow the applicable GM Service Information procedure for Automatic Transmission Wiring Harness Replacement.
  • Perform Diagnostic Repair Verification after the repair, as directed by bulletin 19NA211.

13. Possible repair or resolution

  • GM bulletin 19NA211 specifies replacement of the transmission wiring harness with part number 24285318, HARNESS, A/TRNS WRG SHF POSN SWITCH.
  • The bulletin directs technicians to refer to Automatic Transmission Wiring Harness Replacement in GM Service Information.
  • The bulletin directs completion of Diagnostic Repair Verification after repair.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM manufacturer communication 19NA211, published September 13, 2019 and hosted by NHTSA, lists P0C57, P0C58, P0C61, and P0C62 as additional keywords. The supplied evidence states that the transmission wiring harness should be replaced with part number 24285318 and Diagnostic Repair Verification performed.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Verified official source: NHTSA-hosted GM Manufacturer Communication 19NA211 (MC-10166634-9999), published 2019-09-13: https://static.nhtsa.gov/odi/tsbs/2019/MC-10166634-9999.pdf

19. Frequently asked questions

What does P0C57 mean on an applicable Chevrolet Volt?

The supplied diagnostic record defines P0C57 as Drive Motor 2 Position Sensor Circuit 1 Low Voltage.

Which Chevrolet Volt vehicles are covered by the supplied applicability data?

The supplied applicability data lists US-market 2016 through 2018 Chevrolet Volt vehicles.

What repair is specified in GM bulletin 19NA211?

The supplied bulletin evidence directs replacement of the transmission wiring harness, part number 24285318, followed by Diagnostic Repair Verification.

Is it safe to drive or charge with P0C57?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Chevrolet P0C57: Drive Motor 2 Position Sensor Circuit 1 Low Voltage… | EV Diagnostics