NHTSA ID Number: 11020824
Manufacturer Communication Number: A25-060
TSB/Document Date: 2025-07-23
Summary
Service Bulletin - The piston ring function deteriorates due to ring low wear toughness and sticking from sludge. Oil adheres to the spark plug leading to carbon fouling and misfire. This can set DTCs P0301 No. 1 cylinder misfire detected, P0302 No. 2 cylinder misfire detected, P0303 No. 3 cylinder misfire detected, P0304 No. 4 cylinder misfire detected, and cause the MIL to come on.
Service Bulletin
25-060
July 18, 2025
Version 2
Warranty Extension: 2013–15 Pilot MIL Comes on with DTCs P0301 Thru
P0304 (6 Months)
Superseded 25-060 dated June 17, 2025, to revise the information highlighted in yellow.
REVISION SUMMARY
•
•
Under PARTS INFORMATION, Flange Bolt (side mount bolt to frame bracket) 90163-SDA-A01, was removed from
Repair Procedure A parts list..
Under REPAIR PROCEDURE B, the numbering for steps 49-51 was corrected on page 66.
APPLIES TO
Year
Model
Trim Level
2013–15
Pilot
ALL
VIN Range
Check the iN VIN status for eligibility.
BACKGROUND
The piston ring function deteriorates due to ring low wear toughness and sticking from sludge. Oil adheres to the spark
plug leading to carbon fouling and misfire. This can set DTCs P0301 No. 1 cylinder misfire detected, P0302 No. 2 cylinder
misfire detected, P0303 No. 3 cylinder misfire detected, P0304 No. 4 cylinder misfire detected, and cause the MIL to come
on.
American Honda
is extending the warranty coverage for this condition to January 31, 2026. Any repair orders issued after
that date are no longer valid.
CUSTOMER NOTIFICATION
Owners of affected vehicles will be sent a notification of this campaign.
Do an iN VIN status inquiry to make sure the vehicle is shown as eligible.
CORRECTIVE ACTION
Complete the DIAGNOSIS PROCEDURE and, if necessary, update the PCM software, replace affected spark plugs then
clean pistons and replace the piston rings. If the cylinder wall inspection fails, perform an engine block replacement,
replace the affected spark plugs and update the PCM software.
Additionally, the following videos are available to help with this bulletin:
•
Tech2Tech "How to Clean Piston Ring Grooves"
•
Tech2Tech "Let's Talk Piston Ring Compressors"
•
Tech2Tech "Check out the Cylinder Wall Inspection Tool "
CUSTOMER INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment,
and training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not
assume this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact
an authorized Honda automobile dealer.
© 2025 American Honda Motor Co., Inc. – All Rights Reserved
Page 1 of 109
WARRANTY CLAIM INFORMATION
FLAT RATE NOTE: Repair Procedure A in this bulletin is different than the service manual. This procedure does not
require the complete removal of the power steering pump, catalytic converter(s), engine and transmission, or the
crankshaft. As a result, the operation number is unique and the FRT is reduced.
DTC P0301, P0302, or P0303
No Scratching or Scoring Detected
Operation Description
Number
1115A7
A
C
Flat Rate
Time
DTC P0301, P0302, or
P0303. Inspect spark
plug(s).
0.3 hr
Repair Procedure A:
Remove cylinder head,
inspect cylinders, clean
pistons 1-3, replace
piston rings 1-3, and
replace spark plugs 1-4
(includes idle learn).
8.9 hr
Update the PCM
software (includes
DTC clear).
Defect
Code
6Z600
Symptom
Code
Template ID
GLU00
A25060A
Symptom
Code
Template ID
Failed Part Number
13021-R70-A11
0.1 hr
Scratching or Scoring Detected
Operation Description
Number
Flat Rate
Time
1115A7
DTC P0301, P0302, or
P0303. Inspect spark
plug(s).
0.3 hr
B
Repair Procedure B:
Remove cylinder heads,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
idle learn and align).
10.3 hr
C
Update the PCM software
(includes DTC clear).
0.1 hr
D
For AWD - Add
0.4 hr
Defect
Code
Failed Part Number
A25060B
6Z600
GLU00
13021-R70-A11
A25060C
Page 2 of 109
DTC P0304
No Scratching or Scoring Detected
Operation Description
Number
1115A8
DTC P0304
Flat Rate
Time
Defect
Code
Symptom
Code
Template ID
GLU00
A25060D
Symptom
Code
Template ID
Failed Part Number
0.3 hr
Inspect spark plug(s).
A
C
Repair Procedure A:
Remove cylinder heads,
inspect cylinders, clean
pistons 1-4, replace
piston rings 1-4, and
replace spark plugs 1-4
(includes idle learn).
Update the PCM
software (includes
DTC clear).
10.8 hr
6Z600
13021-R70-A11
0.1 hr
Scratching or Scoring Detected
Operation Description
Number
Flat Rate
Time
1115A8
DTC P0304
Inspect spark plug(s).
0.3 hr
B
Repair Procedure B:
Remove cylinder heads,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
idle learn and align).
10.3 hr
C
Update the PCM software
(includes DTC clear).
0.1 hr
D
For AWD - Add
0.4 hr
Defect
Code
Failed Part Number
A25060E
6Z600
GLU00
13021-R70-A11
A25060F
Page 3 of 109
PARTS INFORMATION
Repair Procedure A - Piston Cleaning and Ring Replacement
Quantity
Part Name
Part Number
Cyl 1-3
Cyl 1-4
Cyl. Gasket (Fr)
12251-R70-A01
Cyl. Gasket (Rr)
12261-R70-A01
1
1
94109-14000
1
1
EGR Pipe Gasket A
18716-R70-A01
1
1
EGR Pipe Gasket B
18719-R70-A01
1
1
Ex. Chamber Gasket
18115-R70-A01 or
18115-5G0-A01
1
2
Ex. Pipe Gasket
18212-SA7-003
2
2
Head Gasket Fr. (Valve Cover)
12030-R70-A00
Head Gasket Rr. (Valve Cover)
12050-R70-A00
1
1
In. Manifold Gasket (Intake Top Cover)
17146-R70-A01
1
1
In. Manifold Gasket (In. Manifold to Base)
17105-RCJ-A01
1
1
15400-PLM-A02
1
1
O-ring (7.47 mm x 3.6 mm)
91301-PLC-000
2
2
O-ring (31.2 mm x 4.1 mm)
91314-PH7-003
2
2
Piston Ring Set
13011-RV0-305
3
4
Pre-chamber Gasket
18393-SDB-A00
1
1
Self-locking Nut (8 mm)
90212-RCA-A01
4
8
Self-locking Nut (10 mm)
90212–SA5-003
9
9
12290-R71-L01
4
4
Strainer O-ring
15221-RYE-A01
1
1
Bolt, Flange (side engine mount bolts)
90164-SHJ-A00
2
2
Bolt, Flange (12 x 115) (side engine mount
bolt)
90161-SZA-A00
1
1
Drain Washer 14 mm
1
1
Page 4 of 109
Repair Procedure A - Piston Cleaning and Ring Replacement – cont.
Quantity
Part Name
Part Number
Cyl 1-3
Cyl 1-4
Timing Belt Bolt
14551-RCA-A01
1
1
Water Gasket Fr.
19411-P8A-A03
1
1
Water Gasket Rr.
19412–P8A-A02
1
1
Part Number
Cyl 1-3
Cyl 1-4
Connecting Rod Bolt (may require up to 2
bolts per connecting rod)
13204–P8A–A01
6
8
Washer-Bolt (12 x 163) (may require up to 8
bolts per cylinder head)
90005–PAA–A01
8
16
Replace Parts as Needed for Repair Procedure A
Part Name
Repair Procedure B - Engine Short Block Replacement
Part Name
Part Number
Quantity
Intake Cover Gasket
17146-R70-A01
1
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- Protection for 10,000 miles between oil changes
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TSB/Document ID: A25-060
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-18
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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