GETTING TO KNOW YOUR INSTRUMENT PANEL- Page 147

2021 Jeep Gladiator Owner's Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
WARNING LIGHTS AND MESSAGES
STARTING AND OPERATING
MULTIMEDIA
SAFETY
OCCUPANT RESTRAINT SYSTEMS
SERVICING AND MAINTENANCE
VEHICLE MAINTENANCE
TECHNICAL SPECIFICATIONS
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GETTING TO KNOW YOUR INSTRUMENT PANEL

145

The OBD II system may not be ready if your 

vehicle was recently serviced, recently had a 

depleted battery or a battery replacement. If the 

OBD II system should be determined not ready 

for the I/M test, your vehicle may fail the test.
Your vehicle has a simple ignition actuated test, 

which you can use prior to going to the test 

station. To check if your vehicle's OBD II system 

is ready, you must do the following:
1. Cycle the ignition switch to the ON position, 

but do not crank or start the engine.

NOTE:

If you crank or start the engine, you will have to 

start this test over.
2. As soon as you cycle the ignition switch to 

the ON position, you will see the 

Malfunction Indicator Light (MIL) symbol 

come on as part of a normal bulb check.

3. Approximately 15 seconds later, one of two 

things will happen:

The MIL will flash for about 10 seconds 

and then return to being fully illuminated 

until you turn OFF the ignition or start the 

engine. This means that your vehicle's 

OBD II system is not ready and you 

should not proceed to the I/M station.

The MIL will not flash at all and will 

remain fully illuminated until you place 

the ignition in the off position or start the 

engine. This means that your vehicle's 

OBD II system is ready and you can 

proceed to the I/M station.

If your OBD II system is not ready, you should 

see an authorized dealer or repair facility. If your 

vehicle was recently serviced or had a battery 

failure or replacement, you may need to do 

nothing more than drive your vehicle as you 

normally would in order for your OBD II system 

to update. A recheck with the above test routine 

may then indicate that the system is now ready.
Regardless of whether your vehicle's OBD II 

system is ready, if the MIL is illuminated during 

normal vehicle operation you should have your 

vehicle serviced before going to the I/M station. 

The I/M station can fail your vehicle because 

the MIL is on with the engine running.

3

21_JT_OM_EN_USC_t.book  Page 145  

Detailed Information for 2021 Jeep Gladiator Owner's Manual

Lists of information found in 2021 Jeep Gladiator Owner's Manual - Page 147

  • 1. Cycle the ignition switch to the ON position, but do not crank or start the engine.
  • 2. As soon as you cycle the ignition switch to the ON position, you will see the Malfunction Indicator Light (MIL) symbol come on as part of a normal bulb check.
  • 3. Approximately 15 seconds later, one of two things will happen:  The MIL will flash for about 10 seconds and then return to being fully illuminated until you turn OFF the ignition or start the engine.

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