Case Number: S2208000020 Rev. C
Release Date:

January 2024

Symptom/Vehicle Issue: Electric Mode Temporarily Unavailable, Cluster Message Displayed
Vehicle in Fuel Oil Refresh Mode (FORM)

Customer Complaint/Technician Observation: Owner complains the vehicle will not go
into Electric Vehicle (EV) mode. Technician observed no Diagnostic Trouble Codes (DTC’s) and the
message for FORM during the initial startup for 5 seconds and the vehicle is not entering EV Mode
during drive test cycles.

Discussion:

Note: message
displays during
initial start up
for 5 seconds.

Operator Choices that can inhibit Electric Mode - and what to do about it
Transmission in Manual Shift mode - Shift to Drive to use Electric mode.
Heavily depressed accelerator pedal position, requesting high power demand - Beyond
the limits of the electric drivetrain, will cause engine to run, enabling the powertrain to produce
its full combined power available in Hybrid mode.
Sustained high speed operation in Electric mode - Using the engine is more efficient for
high speeds than Electric drive.
Transfer case and drive mode selection - eSave mode almost always runs the engine.
Hybrid mode, in 4WD Low, will also run the engine.
Electric range is depleted - You need to recharge to enjoy Electric mode, or you can
continue normally in Hybrid.

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

Hood open (or a hood switch fault) - This is to prevent unexpected engine starts with the
hood open.

Thermal Protection that can inhibit Electric Mode - and why
Engine, transmission, or engine starting belt too cold - Some systems require warm-up to
function properly if the outside temperature is below 32°F (15°F in Electric drive mode).
Electric cabin heating capacity limits (or electric cabin heater fault) - Unlike Battery
Electric Vehicles (BEV's), the PHEV Wrangler can warm the cabin more efficiently with engine
heat when operating below 15°F outside temperature.
HV battery, motors, or contactors over temperature - This is a temporary hardware
protection feature. Vehicle performance will resume once protection is no longer required. If
the vehicle performance is accompanied with a Malfunction Indicator Lamp (MIL) .

Component Protection that can inhibit Electric Mode - and what to do about it
HV battery undervoltage - Sustained EV operation at high speed, especially with aftermarket
wheels and tires, can induce this.
Other electric propulsion system faults indicated by a MIL service required.
Fuel And Oil Refresh Mode

FUEL AND OIL REFRESH MODE Since it is possible to operate this vehicle for extended periods
without running the gas engine, the fuel within the tank can become stale and/or the engine oil’s
lubricating properties can be reduced as the vehicle’s engine is not operating under its normal engine
operating temperatures.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020

To prevent engine and/or fuel system damage due to stale fuel, or lubrication, this vehicle is
equipped with a Fuel Oil Refresh Mode (FORM). The vehicle will automatically enter the Fuel Oil
Refresh Mode to minimize these conditions. When operating in this mode, the gas engine must
operate at its normal operating temperatures, no EV propulsion (electric only operation is inhibited).
A reminder message will be displayed within the cluster during initial start-up whenever Fuel AND Oil
Refresh Mode is active. The vehicle will automatically exit the Fuel Oil Refresh Mode when
conditions have been satisfied for adequate run time of up to 2 hours.
If the vehicle enters Fuel Oil Refresh Mode, due to stale fuel, the engine will run during this
mode, no EV operation until the low fuel level warning is achieved. If desired, it is possible to exit
the Fuel Only Refresh Mode by adding a minimum of four gallons of new fuel to the vehicle.
NOTE: If the vehicle enters Fuel and Oil Refresh Mode to maintain engine lubrication, adding
fuel will not exit the mode sooner. If the vehicle enters Fuel Oil Refresh Mode for lubrication
requirements, the engine must operate at maximum operating temperatures until accumulated engine
run times of 20 minutes to 2 hours. This can be best achieved by engine running at highway speeds
above 50 mph for extended periods. If the vehicle is shut down without the proper accumulated
engine only run time, the engine will run without entering EV mode on subsequent trips.
NOTE: Frequent short trips without (max engine operating temperatures) usually triggers the
lubrication-based oil refresh mode. If the engine run time is not met in-between the oil change
intervals, changing the engine oil, and resetting the service reminder is the recommended option.
DO NOT RESET THE OIL INDICATOR WITHOUT CHANGING THE OIL FOR THIS CONDITION.

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.

Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC

Version 4.3 10/29/2020