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.
Intake Manifold Gasket
17105-RCJ-A01
1
Water Gasket Fr.
19411-P8A-A03
1
Water Gasket Rr.
19412–P8A-A02
1
18115-R70-A01 or
18115-5G0-A01
2
15400-PLM-A02
1
Nut, Self-Locking (catalytic converter)
90212-RCA-A01
8
Washer, Sealing (24MM) (6AT Fill Plug Washer)
11107-PWA-300
1
Washer, Drain Plug (18MM) (6AT Drain Plug Washer)
90471-PX4-000
1
Washer, Drain Plug (20MM) (5AT Drain Plug Washer)
94109-20000
1
Gasket, Prechamber
18393-SDB-A00
1
Gasket, Exhaust Pipe
18212-SA7-003
2
Nut, Self-Lock (10MM) (Exhaust pipe A nuts)
90212-SA5-003
9
Bolt, Flange (side mount bolt to frame bracket)
90163-SDA-A01
2
Catalytic Converter Gasket
Page 5 of 109
Repair Procedure B - Engine Short Block Replacement – cont.
Bolt, Flange (side engine mount bolts)
90164-SHJ-A00
2
Bolt, Flange (12X115) (side engine mount bolt)
90161-SZA-A00
1
90163-S5A-000
8
90371-SAA-010
4
Bolt, Flange (10X75) (Rear engine mount bolts)
95701-10075-08
2
O-Ring (8.8X2.4)
15142-P8A-A00
2
Bolt, Flange (10X50)
95701-10050-08
4
90163-SDB-A00
3
90163-SHJ-A00
4
Bolt, Flange (10X85) (Select)
90002-R70-A00
1
Bolt, Flange (10X120)
95801-10120-08
2
O-Ring (14.4X1.9) (P.S Line)
91370-TA0-000
1
91301-PLC-000
2
Starter Motor Gasket
31270-RJA-A01
1
Gasket A, EGR Pipe (EGR pipe gasket)
18716-R70-A01
1
Gasket B, EGR Pipe (EGR pipe gasket)
18719-R70-A01
1
Gasket, Rear Cylinder (head gasket)
12261-R70-A01
1
Gasket, Front Cylinder (head gasket)
12251-R70-A01
1
Head Gasket Fr. (Valve Cover)
12030-R70-A00
1
Head Gasket Rr. (Valve Cover)
12050-R70-A00
1
O-Ring (O-rings for coolant pipe)
91314-PH7-003
2
Timing Belt Bolt
14551-RCA-A01
1
Bolt, Timing Belt Adjuster
14513-RCA-A01
1
Bolt, Flange (strut to knuckle)
90119-SJC-A00
4
Nut, Flange (strut to knuckle)
90381-SJC-A00
4
Bolt, Flange (10X25) (Propeller Shaft)
90113-S3V-A00
4
Bolt, Flange (special bolt, subframe)
90165-SHJ-A00
4
Bolt, Flange (special bolt; rear subframe bolt)
90161-SHJ-A00
2
Bolt, Flange (10X20) (Front & Rear engine mount
bolts)
Nut, Flange (12MM) (Front & Rear Engine Mount
stopper nuts)
Bolt, Flange (10X30) (Front engine mount bracket
bolts)
Bolt, Flange (12X83) (Rear engine mount bracket
bolts)
Page 6 of 109
Repair Procedure B - Engine Short Block Replacement – cont.
Bolt, Flange (12X28) (subframe bracket bolt)
90181-SK3-E00
2
91333-PNA-003
1
Engine Short Block (2013-2015)
10002-RN0-305
1
Part Number
Quantity
90005–PAA–A01
16
Replace Parts as Needed for Repair Procedure B
Part Name
Washer-Bolt (12 x 163) (may require up to 8 bolts per
cylinder head)
REQUIRED MATERIALS
Repair Procedure A
Material Description
Part Number
Quantity
08CLA-P99-0F0A8
3 gallons
Full Synthetic Engine Oil 0W-20 Oil
08798–9163
6 quarts
Hondabond HT (1 Tube Repairs 5 Vehicles)
08718–0004
1 tube
Genuine Honda
Throttle Plate Cleaner
08700–TPCB
1
Honda Long-Life Antifreeze/Coolant Type 2
Nylon Parts Cleaning Brush
(commercially available)
5/16 ID Flexible Hose
(commercially available)
Repair Procedure B
Material Description
Part Number
Quantity
08CLA-P99-0F0A8
3 gallons
Full Synthetic Engine Oil 0W-20 Oil
08798–9163
6 quarts
Power steering Fluid (12oz)
08206-9002
1
ATF-DW1
08200-9008
4
Hondabond HT (1 Tube Repairs 10 Vehicles)
08718–0004
1 tube
(commercially available)
1
Honda Long-Life Antifreeze/Coolant Type 2
5/16 ID Flexible Hose
Page 7 of 109
TOOL INFORMATION
Repair Procedure A
Tool Name
Tool Number
Quantity
Piston Ring Groove Cleaner
07AAZ–TA5A100
1
Cylinder Wall Inspection Tool
07AAJ-R70A301
1
LIL50190
1
Snap-On PRS8 or equivalent
1
SCP1289 or equivalent
1
Tool Number
Quantity
KLS6227500
1
07AAJ-R70A301
1
Engine hoist
(commercially available)
1
Load leveler
NRI78115H
1
Gasket Remover/Pan Separator
Piston Ring Expander
Piston Ring Compressor
NOTE: Each dealer was sent one cylinder wall inspection tool.
Repair Procedure B
Tool Name
Lift table
Cylinder Wall Inspection Tool
NOTE: Each dealer was sent one cylinder wall inspection tool.
Page 8 of 109
INSPECTION PROCEDURE
1. Connect the i-HDS and check for the following 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
Are any of these DTCs stored?
YES – Go to step 2.
NO – Stop. This bulletin does not apply. Continue with normal troubleshooting.
2. Relieve the fuel pressure using i-HDS. Refer to the service manual for the full procedure.
3. Remove the engine cover, then remove the appropriate Ignition coils and spark plugs based on the DTCs stored.
Example: If P0301 is stored, remove the ignition coil on cylinder No. 1.
Page 9 of 109
4. Check the spark plug(s) of the affected cylinder(s).
Example: If P0301 is stored, check the spark plug on cylinder No. 1.
DTC Stored
P0301
Diagnostic
Spark plug
condition?
Repair Process
Not fouled
This bulletin does not apply. Continue with
normal troubleshooting.
Remove the #1 cylinder spark plug
and inspect for fouling.
Fouled
Not fouled
P0302
Remove the #2 cylinder spark plug
and inspect for fouling.
Fouled
Not fouled
P0303
Remove the #3 cylinder spark plug
and inspect for fouling.
Fouled
P0304
Remove the #4 cylinder spark plug
and inspect for fouling.
Not fouled
Fouled
P0305
P0306
Proceed to step 5.
This bulletin does not apply. Continue with
normal troubleshooting.
Proceed to step 5.
This bulletin does not apply. Continue with
normal troubleshooting.
Proceed to step 5.
This bulletin does not apply. Continue with
normal troubleshooting.
Proceed to step 5.
This bulletin does not apply. Continue with
normal troubleshooting.
Page 10 of 109
5. Remove the affected cylinder head(s) to inspect the cylinder bores.
DTCs Stored with fouled
spark plug(s)
P0301, P0302, or P0303
P0304
Diagnostic
Remove the rear cylinder head and inspect cylinder bores 1-3 for scratching or
scoring using the cylinder head inspection tool.
Remove the front and rear cylinder heads and inspect cylinder bores 1-4 for
scratching or scoring using the cylinder head inspection tool.
NOTICE
•
•
•
Use fender covers to avoid damaging painted surfaces.
To avoid damaging any wires and terminals, unplug the circuit connectors carefully while holding the connector
portion.
Mark all the circuits and hoses to avoid misconnection. Make sure they do not contact other circuit wiring, hoses,
or interfere with other parts.
1. Remove both front wheels to allow the vehicle to be fully lowered.
2. Do the 12-volt battery removal procedure.
3. Disconnect the fuel feed hose quick-connect fitting at the bulkhead.
Page 11 of 109
4. Remove the radiator cap.
5. Raise the vehicle.
6. Remove the front splash shield.
7. Drain the engine oil.
8. Loosen the drain plug on the radiator and drain the coolant.
Page 12 of 109
- 6X better wear protection on critical engine parts than...
- 1.3X better sludge protection than industry standards*
- 3X Stronger against viscosity breakdown than leading full...
- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
- Extra detergents safeguard against friction, corrosion and...
- Advanced friction-fighting additives help maximize...
- Provides performance benefits for high mileage, new and...
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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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