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Service bulletin 08-048-16

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10076284
Published by NHTSA2016-07-07
Manufacturer's number08-048-16
Manufacturer's date2016-04-22
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

SUBJECT: FLASH: Electric Vehicle Control Unit (EVCU) System Enhancements OVERVIEW: This bulletin involves updating the software in the EVCU. 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 of time. · When the battery temperature is below -30°C (-22°F) and above 50°C (122°F), the thermal system does not function. · When a Level 1 EVSE is plugged in, the displayed charge time estimation for Level 2 is over estimated. The following improvements/enhancements are also included in this software release: · Improved shift strategy involving shift lever position.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Electrical system

Trouble codes named

P1A21

Vehicles listed
FIAT 500E2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
16V3030002016-05-16. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
15V1790002015-03-27. ELECTRICAL SYSTEM:12V/24V/48V BATTERY
14V2350002014-05-07. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
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S14080003842023-04-17. Service bulletin. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
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08103142023-02-21. Service bulletin. Convergence Telematics Module (CTM) Software Enhancements
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S21080001632023-01-17. Service bulletin. No Start, Cannot Complete Module Replace, Proxi Or Module Proxi Configuration