GROUP
BODY

Technical Service Bulletin
SUBJECT:

DATE

NUMBER
25-BD-012H
MODEL(S)

NOVEMBER 2025

ALL

INFORMATION FOR LAMP CONDENSATION

This TSB supersedes 23-BD-002H to update the Warranty Information on page 1, add parts
information for headlamp desiccant on page 2, and update the Condensation Repair Flowchart
on page 4.
Description: This bulletin provides information regarding condensation related to the accumulated
moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB
illustrates the various causes of condensation inside the lamp assembly.
Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by
turning on the lamps with the engine running for several minutes or during normal driving operation.

Applicable Vehicles: All

NOTICE
To avoid any potential damage to IONIQ vehicles, IONIQ repairs can only be performed at IONIQ
certified dealers.

Warranty Information:
NOTE 1: Normal warranty applies for any lamp assembly with condensation. If a lamp desiccant/
moisture absorbent pack is replaced, file the warranty claim with the desiccant/moisture absorbent
pack as the replacement part and the lamp assembly as the causal part. See the previous page for
the referenced headlamp/sub-assembly or desiccant/moisture absorbent pack part prefix. Do NOT
use the lamp assembly for the replacement part.
NOTE 2: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

INFORMATION FOR LAMP CONDENSATION

SUBJECT:

Parts Information:
Model
All

Part Name
Desiccant/Moisture Absorbent Pack

Part Number

Remarks

92125-*****

Order the correct part
number from parts catalog
for each specific model

Service Procedure:

DIGITAL DOCUMENTATION
This TSB includes Repair justification photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.

NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.

Table of Contents
•

A. Causes of Lamp Condensation ............................................................................................3

•

B. Condensation Repair Flowchart ...........................................................................................4

•

C. Lamp Condensation Identification ........................................................................................5

•

D. Lamp Assembly Drying Guidelines ......................................................................................6

TSB #: 25-BD-012H

Page 2 of 6

SUBJECT:

INFORMATION FOR LAMP CONDENSATION

A. Causes of Lamp Condensation
1.

Natural Condensation

2.

Condensation from Engine Startup

i

Information

The amount and location of condensation will vary based on environmental factors and vehicle
usage conditions (lamp usage, driving time and/or distance, etc.).
Condensation may occur on only one side of the vehicle if it is parked in a certain position that
exposes one side to direct sunlight while the other side is in shade.
A similar example of the natural occurrence of condensation is windshield fogging. During cold
temperatures, the warm air inside the cabin may condense on the windshield if it has enough
moisture. This occurs because the warm air is cooled down past its dew point as it flows over the
cold windshield surface.
The dew point is the temperature at which the air is unable to “hold” any more water vapor. The
water vapor in the air will begin to condense into liquid droplets (dew) if the air is cooled down
past its dew point.
TSB #: 25-BD-012H

Page 3 of 6

INFORMATION FOR LAMP CONDENSATION

SUBJECT:

B. Condensation Repair Flowchart
Vehicle In

Lamp condensation is present.
Refer to C. Lamp Condensation
Identification (page 6)

Normal
condensation

Is condensation
normal or caused
by a water leak?

Water leak

Perform procedure in D. Lamp
Assembly Drying Guidelines
(page 7)

No

Remove lamp assembly and
inspect for external damage
and/or aftermarket modifications

Condensation
still present?

No

External damage
or modifications
present?

Yes
Yes

Replace desiccant or moisture
absorbent pack inside lamp
assembly.
Repeat procedure in D. Lamp
Assembly Drying Guidelines
(page 7)

Condensation
still present?

No

Yes

Submit Digital
Documentation photos
of condensation

No
Replace affected lamp
sub-assembly or lamp
assembly

Condition resolved,
Repair is complete.

Vehicle Out

TSB #: 25-BD-012H

Damage or
modifications
caused by external
influence?
Yes

Repair NOT covered
under warranty

Replace ONLY the lamp sub-assembly if
available separately.
Refer to parts catalog for correct part
number.

Page 4 of 6

INFORMATION FOR LAMP CONDENSATION

SUBJECT:

C. Lamp Condensation Identification
1.

Normal Condensation:

Normal Condensation in the Lamp

Condensation occurring inside the lamp
assembly after rain or a car wash cycle is
considered a natural occurrence.
Condensation can also occur after the vehicle
is parked outside during cold temperatures.
This condition occurs when water vapor inside
the lamp assembly is exposed to temperature
variations.
This condensation is NORMAL and
replacement is NOT REQUIRED.

i

Information

Refer to B. Condensation Repair
Flowchart on page 4 for service
procedures to remove normal
condensation.
2.

Water Leak:

Water Collecting Inside the Lamp

If water is collecting at the bottom of the
lamp assembly, water streaks are present, or
the condensation remains after the lamps
have been on for 30 minutes or more, there
may be a water leak in the assembly. The
leak may be caused by a poor seal between
the lamp housing and lens, cracks in the
lamp assembly, or poor fitment.
The condition should be diagnosed and
repaired as necessary.

TSB #: 25-BD-012H

Page 5 of 6

SUBJECT:

INFORMATION FOR LAMP CONDENSATION

D. Lamp Assembly Drying Guidelines
1.

Ensure that the vehicle is parked in a well-ventilated area and that the dust cap(s) have been
removed prior to drying the lamp assembly.

2.

Certain lamp assemblies may have two dust caps. Remove both dust caps if applicable.

3.

To avoid battery discharge, the engine must be running while the lamps are ON.

4.

Allow the vehicle to idle for 30 minutes with the engine running and lamps turned ON for the
condensation and moisture to evaporate.

5.

Reinstall the dust cap(s) after drying the lamp assembly.

6.

If condensation still remains, replace the lamp dessicant or moisture absorbent pack, if
equipped, and repeat the lamp assembly drying procedure again.
Example Location of Dust Cap

TSB #: 25-BD-012H

Page 6 of 6