NHTSA ID Number: 11028893
Manufacturer Communication Number: S2607000003
TSB/Document Date: 2026-02-19
Summary
GMET4 DOHC Water Pump Coolant Leak Inspection
Case Number: S2607000003
Release Date: February 2026
Symptom/Vehicle Issue: GMET4 DOHC Water Pump Coolant Leak Inspection
Models: 2024 - 2026 – Wrangler (JL/J6), Grand Cherokee (WL), Tonale (GC), Hornet
(GG), Commander (H1), Compass (MP/M1), Giulia (GA), Stelvio (GU)
Customer Complaint/Technician Observation: The customer’s complaint may
include coolant odor or observation of fluid leakage under the vehicle.
Discussion: REVIEW THE FOLLOWING INSPECTION POINTS TO IDENTIFY ALL
POTENTIAL LEAK SOURCES IN THE ENGINE COMPARTMENT BEFORE
PERFORMING PARTS REPLACEMENT.
Symptom/Vehicle Issue: Suspected Engine Coolant Leak
Check the coolant level of the suspected vehicle before starting the engine:
• If the coolant level is significantly reduced:
▪ Perform visual inspection of the entire engine cooling components using UV
light (including all cooling system hoses, hot bottle/coolant reservoir/expansion
tank, radiator, HVAC heaters, etc):
▪ If the leak source is identified, please proceed with the leaked component
replacement.
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
Stellantis US LLC
Version 4.5 06/08/2022
Coolant leaks can originate from various pump interfaces:
A. Pump to Block interface
B. Internal Pump gasket
C. Inlet pipe to pump interface
D. Pump weep hole
E. Inlet pipe nipple
Inspection
Action
Evidence of coolant leak at
Replace gasket and reuse pump
interface
Gasket damage
Possible Oil at interface
No damage to pump operation
Damage to pump operation
Replace pump
Internal pump gasket
Evidence of coolant originating
Replace pump
from pump housing to cover
interface
Inlet pipe to pump interface Evidence of coolant leak
Replace inlet tube and gasket
Pump Weep Hole
Evidence of ‘wet’ coolant at
Replace pump
interface
Inlet Pipe Nipple
Evidence of coolant around
Replace inlet pipe and gasket
interface between nipple and inlet
pipe
Leak Location
A. Pump to Block interface
B.
C.
D.
E.
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
Stellantis US LLC
Version 4.5 06/08/2022
A. Coolant Leak Between Pump and Block:
• Leak at block interface is likely due to gasket damage
• Inspect gasket – If gasket is broken, torn, split, or has lost compression
Replace gasket with new
• If pump spins without obvious sticking, pump should be reused, otherwise replace
entire pump assembly
Gasket - Damage
B. Internal Water Pump Gasket:
• If leak appears to originate at internal gasket – Replace with new pump assembly
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
Stellantis US LLC
Version 4.5 06/08/2022
C. Inlet Pipe to Pump Interface:
• Leak at inlet pipe interface is likely due to loss of torque of fasteners
• If pump spins without obvious sticking, pump should be reused, otherwise replace
entire pump assembly along with Inlet Pipe assembly.
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
Stellantis US LLC
Version 4.5 06/08/2022
D. Water Pump Weep Hole:
New Vehicle (<500miles)/New Water Pump Inspection:
• Trace coolant or residue may be found at the weep chamber plug. The presence of
trace coolant residue does not indicate a failed pump. The presence of liquid
coolant is unacceptable at any time.
• If coolant is dripping from the weep chamber:
o Raise the vehicle.
o Verify that the coolant is effectively dripping from the weep chamber.
o Run the engine at idle and perform repeated speed variations between 2000
and 4000 rpm.
o Maintain this procedure for 15 minutes.
• If after 15 minutes the coolant is still dripping:
o The water pump must be replaced (possible permanent damage to the
dynamic seal).
o If the coolant stops dripping:
o No further action is required.
o Remove coolant traces with a towel from the WP
o The vehicle can be released/returned to the customer.
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
Stellantis US LLC
Version 4.5 06/08/2022
Customer Vehicles (>500 miles)/Original Water Pump:
• Trace coolant or residue may be found at the weep chamber plug. The presence
of trace coolant residue does not indicate a failed pump. The presence of liquid
coolant is unacceptable at any time. If dripping coolant or traces of liquid coolant
at the weep chamber are found, replace the pump.
*** Note: Some coolant residues may be found at the water pump weep hole plug area
which may be normal, but coolant should not be dripping from this location as in the
following picture:
OK PUMP:
-
The coolant leak cannot be repeated
Less contamination range around weep hole
NO wetness without contamination when
contacting the leak marks with paper towel
NO coolant dripping frome the pump after
starting the engine
Compare the coolant level before engine on
and 10 minutes after with no coolant
decrease
NOT OK PUMP:
-
The coolant leak is repeated
Wetness when contacting the leak marks
with paper towels
Coolant dripping from the pump when Engine
running
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
Stellantis US LLC
Version 4.5 06/08/2022
E. Inlet pipe Nipple:
• If nipple interface area shows signs of coolant pooling or dripping replace inlet pipe
assembly
• If interface shows signs of coolant pooling or dripping – replace Inlet Pipe Assembly
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
Stellantis US LLC
Version 4.5 06/08/2022
When a water pump is identified as defective, please submit a DID-I using the Quick Incident
Report (QIR) button in Service Library. Please include pictures showing the source of the leak.
See a screen shot below from the QIR system in Service Library for reference.
NOTE: Please document and apply the appropriate Labor Operation Procedure (LOP) for the
repair performed, as this information helps engineering accurately identify root causes and
improve future service processes.
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
Stellantis US LLC
Version 4.5 06/08/2022
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TSB/Document ID: S2607000003
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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