Fiat P1A21-00
HV Battery Contactor Control Sequence Incorrect. In addition the customer may notice one of the following conditions: • When an Electric Vehicle Supply Equipment (EVSE) is plugged
Common search variants: P1A2100 · P1A21 00 · P1A21_00 · Search ignores case and common separators.
Quick answer
Fiat P1A21-00: HV Battery Contactor Control Sequence Incorrect. In addition the customer may notice one of the following conditions: • When an Electric Vehicle Supply Equipment (EVSE) is plugged
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 Fiat P1A21-00 mean?
Fiat P1A21-00: HV Battery Contactor Control Sequence Incorrect. In addition the customer may notice one of the following conditions: • When an Electric Vehicle Supply Equipment (EVSE) is plugged
2. Technical explanation
The identity of P1A21-00 is verified for Fiat. Available evidence does not yet establish a narrower subsystem or component-level failure.
3. What system is affected?
Not yet established by verified evidence.
4. How serious is this code?
Not yet established by verified evidence. Urgency must be based on the exact vehicle warning and official guidance.
5. Fiat P1A21-00 symptoms you may notice
Not yet established by verified evidence.
6. Possible causes of Fiat P1A21-00
Not yet established by verified evidence. A diagnostic identifier alone is not proof that a specific component has failed.
7. Can I drive with Fiat P1A21-00?
Not yet established by verified evidence.
8. Can I charge with Fiat P1A21-00?
Not yet established by verified evidence.
9. What you can safely do
- Preserve the exact diagnostic code and any accompanying vehicle warning before clearing anything.
- Follow the manufacturer instructions shown in the vehicle or owner/service documentation.
- Do not open or work on high-voltage components unless you are qualified and equipped for high-voltage service.
10. How to troubleshoot Fiat P1A21-00
- Record the exact code, warning text, vehicle model, model year, and operating condition when it appeared.
- Check the verified manufacturer or regulator source linked on this page for code-specific instructions.
- Avoid replacing parts based only on the code; code-specific component tests are not inferred when evidence does not provide them.
- Escalate to qualified service when the warning persists, affects driving/charging, or manufacturer guidance requires service.
11. When to contact service
Qualified service should be contacted if the warning persists, returns after a normal manufacturer-permitted restart, or affects driving or charging.
12. What the service center may check
Not yet established by verified evidence.
13. Possible repair or resolution for Fiat P1A21-00
Not yet established by verified evidence.
14. Affected vehicles
- Fiat 500e · 2013–2016 · US
15. Related TSBs / service bulletins
- NHTSA: NHTSA Manufacturer Communication PDF 10139961: 08-048-16
- NHTSA: NHTSA Manufacturer Communication PDF 10224661: 0804816
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
nd equipped with the 83 kW Electric Motor (Sales Code E99). NUMBER: 08-048-16 GROUP: Electrical DATE: April 22, 2016 SYMPTOM/CONDITION: A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, the technician may find the following Diagnostic Trouble Code (DTC) set in the EVCU memory: • P1A21-00 - HV Battery Contactor Control Sequence Incorrect. In addition the customer may notice one of the following conditions: • When an Electric Vehicle Supply Equipment (EVSE) is plugged in approximately 17 seconds after key off, the vehicle will not charge and will not power down. This could lead to potential 12V battery drain after prolonged period o
19. Fiat P1A21-00 frequently asked questions
What does P1A21-00 mean?
Fiat P1A21-00: HV Battery Contactor Control Sequence Incorrect. In addition the customer may notice one of the following conditions: • When an Electric Vehicle Supply Equipment (EVSE) is plugged
Can I drive with P1A21-00?
Not yet established by verified evidence.
Can I charge with P1A21-00?
Not yet established by verified evidence.
Does P1A21-00 require service?
Qualified service should be contacted if the warning persists, returns after a normal manufacturer-permitted restart, or affects driving or charging.