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Ford P1A3C

board charger controller module (OBCC). The P1A3C is commonly set due to an interruption of the direct current (DC) fast charging process and should be disregarded. All other DTCs

DriveNot yet established by verified evidence.
ChargeFor covered Mustang Mach-E bulletin conditions, the high-voltage battery will not charge. Charging capability outside those conditions is not yet established by verified evidence.
ServiceService evaluation is appropriate when P1A3C is accompanied by a wrench indicator or inability to charge. The supplied evidence does not establish whether immediate towing is required.
Confidence95%

Quick answer

For applicable Ford Mustang Mach-E vehicles, P1A3C is associated with the off-board charging controller (OBCC). Ford communications identify cases where the wrench indicator is illuminated and the high-voltage battery will not charge, often with additional OBCC codes. A separate Ford communication says P1A3C can be set by an interruption to DC fast charging and should be disregarded for specified Transit/F-150 Lightning vehicles; that statement is not established here as applicable to Mustang Mach-E.

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 P1A3C mean?

For applicable Ford Mustang Mach-E vehicles, P1A3C is associated with the off-board charging controller (OBCC). Ford communications identify cases where the wrench indicator is illuminated and the high-voltage battery will not charge, often with additional OBCC codes. A separate Ford communication says P1A3C can be set by an interruption to DC fast charging and should be disregarded for specified Transit/F-150 Lightning vehicles; that statement is not established here as applicable to Mustang Mach-E.

2. Technical explanation

Verified Ford/NHTSA communications list P1A3C in the OBCC module. For 2021 Mustang Mach-E vehicles, and later Mustang Mach-E vehicles built on or before September 17, 2022, the cited bulletins describe P1A3C alongside U3000:16, U3000:64, U3000:04 and/or U3000:45, an illuminated powertrain malfunction (wrench) indicator, and an HV battery that will not charge. The supplied evidence does not establish a component-level failure mechanism for P1A3C on Mustang Mach-E vehicles.

3. What system is affected?

Off-board charging controller (OBCC), also described in the diagnostic record as the board charger controller module.

4. How serious is this code?

Unknown. The verified bulletins describe a charging-related condition and an illuminated wrench indicator, but the supplied evidence does not assign a severity level.

5. Symptoms you may notice

  • Illuminated powertrain malfunction (wrench) indicator on covered Mustang Mach-E vehicles.
  • High-voltage battery will not charge on covered Mustang Mach-E vehicles.

6. Possible causes

  • For Mustang Mach-E: Not yet established by verified evidence.
  • A Ford communication for specified Transit/F-150 Lightning vehicles states that P1A3C is commonly set following interruption of DC fast charging. Applicability of that statement to Mustang Mach-E is not established by the supplied evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

For covered Mustang Mach-E bulletin conditions, the high-voltage battery will not charge. Charging capability outside those conditions is not yet established by verified evidence.

9. What you can safely do

  • Do not attempt high-voltage diagnosis or repair.
  • If the wrench indicator is illuminated and the vehicle will not charge, arrange diagnosis by a Ford dealer or qualified EV service provider.
  • Record whether the condition occurred during AC charging or DC fast charging and retain any displayed messages for service diagnosis.

10. Step-by-step troubleshooting

  1. Have the OBCC module checked for stored diagnostic trouble codes.
  2. Have service assess P1A3C together with any accompanying U3000:16, U3000:64, U3000:04, or U3000:45 codes.
  3. For Mustang Mach-E-specific repair steps, rely on the applicable Ford service bulletin and vehicle identification/build information.

11. When to contact service

Service evaluation is appropriate when P1A3C is accompanied by a wrench indicator or inability to charge. The supplied evidence does not establish whether immediate towing is required.

12. What the service center may check

  • Confirm vehicle model year and build date against the applicable Mustang Mach-E bulletin criteria.
  • Retrieve OBCC diagnostic trouble codes.
  • Assess whether P1A3C is accompanied by U3000:16, U3000:64, U3000:04 and/or U3000:45.
  • Follow the applicable Ford bulletin procedure; detailed repair steps are not provided in the supplied evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied bulletin summaries identify the condition but do not provide the repair procedure or resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • TSB 22-2057, published February 24, 2022: applies to 2021 Ford Mustang Mach-E vehicles in the supplied evidence; describes wrench indicator, P1A3C and/or listed U3000 codes in the OBCC, and an HV battery that will not charge.
  • TSB 22-2402, published October 25, 2022: applies to Mustang Mach-E vehicles built on or before September 17, 2022 in the supplied evidence; describes the same reported condition.
  • TSB 22-2496, published December 20, 2022: applies to Mustang Mach-E vehicles built on or before September 17, 2022 in the supplied evidence; describes the same reported condition.

16. Recall information

  • Not yet established by verified evidence. No recall information was supplied.

17. Official manufacturer information

Official NHTSA-hosted Ford communications supplied: TSB 22-2057 (NHTSA ID 10208344), TSB 22-2402 (NHTSA ID 10225507), and TSB 22-2496 (NHTSA ID 10228832).

19. Frequently asked questions

What does P1A3C refer to?

The supplied diagnostic record associates P1A3C with the off-board charging controller (OBCC).

Can P1A3C prevent a Mustang Mach-E from charging?

The cited Mustang Mach-E bulletins describe vehicles with P1A3C and/or specified U3000 codes where the high-voltage battery will not charge.

Should P1A3C always be disregarded?

No Mustang Mach-E-specific evidence supplied says to disregard it. A separate Ford communication says it may be disregarded after an interrupted DC fast-charge process for specified Transit/F-150 Lightning vehicles; its applicability to Mustang Mach-E is not established.

Is P1A3C safe to drive with?

Not yet established by verified evidence.

20. Sources & verification

Verified
Ford P1A3C: board charger controller module (OBCC). The P1A3C is… | EV Diagnostics