NHTSA ID Number: 11020825
Manufacturer Communication Number: A25-061
TSB/Document Date: 2025-07-23
Summary
Service Bulletin - The piston ring function deteriorates due to ring wear and sticking from sludge. Oil from the crankcase 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.
14. Set the piston in the ring compressor and position the piston in the cylinder based on the rod/cap marks that were
made during disassembly.
15. Set the ring compressor on the piston bore, then push the piston in with your hands.
16. Stop after the ring compressor pops free and check the connecting rod-to-rod journal alignment before pushing the
piston into place.
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17. Measure the diameter of the connecting rod bolts to determine if they need replacement. Calculate the difference in
diameter between point A and point B. It should not be more than 0–0.1 mm (0–0.004 in). Any bolts exceeding
specification should be replaced.
18. Install the connecting rod cap and bearing by applying new oil to the connecting rod bolt threads and flanges. Torque
the bolts to 20 N•m (14 lb-ft) then tighten the connecting rod bolts an additional quarter turn (90 degrees).
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19. Install the baffle plate, then install the oil strainer with a new O-ring..
20. Install the oil pan and tighten the bolts in 3 steps. In the final step, tighten all bolts in sequence to 12 N·m (8.9 lb-ft).
21. Lower the vehicle.
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22. Install the cylinder head(s).
NOTE: The crankshaft and camshafts should be set to TDC.
Steps for torquing the cylinder head bolts to specification:
1. Apply new engine oil to the threads and under the bolt heads.
2. Torque the cylinder bolts in sequence to 29 N·m (22 lb-ft).
3. Tighten in sequence an additional 90 degrees (third step).
4. Tighten in sequence an additional 90 degrees (fourth step).
5. If the bolts are new, tighten an additional 90 degrees.
Cylinder Head Bolt Installation Sequence
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23. Install the catalytic converter(s). Torque the nuts to their specified torque.
24. Install the timing belt, covers and crank pulley. (Click Here)
25. Install the timing belt auto-tensioner.
NOTE: Refer to the service manual for the procedure to compress the timing belt auto-tensioner before installation.
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26. Perform valve clearance check and adjust.
27. Replace spark plugs 1–4.
28. Raise the vehicle.
29. Install exhaust pipe A (A) with new gaskets (B) and nuts.
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30. Reinstall the remaining components in reverse order of removal.
31. Install a new oil filter and refill the engine with engine oil.
At Oil Change: 4.0 L (4.2 US qt)
At Oil Change including Filter:4.3 L (4.5 US qt)
After Engine Overhaul:
5.0 L (5.3 US qt)
32. Move the shift lever to each gear and verify that the A/T gear position indicator follows the transmission range switch.
33. Refill the radiator with engine coolant.
34. Inspect for fuel leaks. Turn the ignition switch to ON (II) (do not operate the starter) so the fuel pump runs for about 2
seconds and pressurizes the fuel line. Repeat this operation three times, then check for fuel leakage at any point in the
fuel line.
35. Check the PCM software version P/N located above the PGM-FI Data List.
Year
Model
2013
Odyssey
2014–16
Odyssey
37805-RV0-A660
Odyssey
37805-RV0-A020
2017
37. Do the PCM update, if needed.
Program ID
37805-RV0-C010 (5AT)
37805-RV0-C110 (6AT)
NOTE: For information on updating the PCM see service bulletin 22-100 Updating Control Units/Modules with the
Honda
ECU Reprogramming Application.
Is the PCM Program ID and/or Program P/N current than what is listed?
• YES – The correct software is installed
• NO – The PCM software needs to be updated
38. Do the Idle Learn Procedure.
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REPAIR PROCEDURE B
Engine Short Block Replacement
NOTE: Removed the front cylinder head, if applicable, follow the INSPECTION PROCEDURE.
1. Disconnect steering column at the joint.
2. Disconnect the engine wire harness (A) and starter cable (B) from the main under-hood fuse box (C), then remove the
main under-hood fuse box and the harness clamps (D).
3. Remove the harness clamps (A) and the bolts (B) and loosen the bolt (C), then remove the battery base (D).
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4. Remove coolant connecting pipe.
5. Disconnect transmission shift cable.
6. Disconnect the A/C compressor clutch connector (A), then remove the A/C compressor (B) without disconnecting the
A/C hoses.
NOTE:
• Do not bend the A/C hoses excessively.
• Hang the A/C compressor with a wire tie.
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7. Remove the power steering fluid from the reservoir (A) to prevent fluid leaks.
8. Disconnect the power steering pump inlet hose (A) and the power steering pump outlet hose (B) from the power
steering pump, then plug the power steering hoses and the power steering pump. Remove the power steering hose
bracket (C).
9. Lift the vehicle and drain the transmission fluid. 5-Speed AT, 6 Speed AT.
NOTE: Re-install the drain bolt with a new washer after draining the transmission fluid. Torque the drain bolt and
washer to the specified torque 49 N·m (5.0 kgf·m, 36 lbf·ft).
10. Remove the left fender liner.
11. Disconnect lower A/T cooler hoses. 5 Speed AT 6 Speed AT
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12. Remove transmission ground bolt/cable (A).
(5AT)
(6AT)
13. Remove damper pinch bolts and flange nuts, repeat for both sides.
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14. Remove the left side brake hose mounting bolt (A), then remove the caliper bracket mounting bolts (B) and remove the
caliper (C) from the knuckle. Repeat the procedure for the right side.
NOTE: To prevent damage to the caliper assembly or brake hose, use a short piece of wire to hang the caliper
assembly from the undercarriage. Do not twist the brake hose excessively.
15. Remove the flange nut (A) while holding the joint pin (B) with a hex wrench (C), and disconnect the upper stabilizer link
(D) from the damper.
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16. Remove left and right speed sensor.
17. Disconnect the front and rear engine harness connector.
18. Disconnect front suspension stroke sensor connector (A) and unclip harness clamps.
19. Disconnect the front and rear engine harness connector (A).
FRONT
REAR
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20. Disconnect the lower power steering switch connector (A).
21. Remove the CKP sensor cover and bolts, then disconnect the CKP sensor connector.
22. Loosely install the crankshaft pulley bolt.
23. Remove the torque converter case cover and the four bolts securing the oil pan to the transmission.
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24. Remove the torque converter cover (C), then remove the eight bolts (B) that attach the drive plate (A) to the
torque converter.
25. Position the lift table to support the engine and subframe.
26. Set a commercially available lift pad under the transmission.
27. Lift the vehicle enough to set the lift table under the subframe.
28. Remove the subframe hardware with the engine and transmission still attached on the subframe. (Click Here)
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29. Lower the lift table.
30. With the lift table out of the way, lower the vehicle.
31. Remove the dowel pins from the original engine block.
32. Remove the front engine mount stop (A), then the engine mount mounting bolt (B).
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33. Remove the rear engine mount bracket (A) and engine mount (B).
34. Remove the right driveshaft support base and set the driveshaft to the side. (Click Here)
NOTE: Take care not to damage the driveshaft seal in the transmission.
35. Set the engine harness to the side.
36. Attach the engine hoist and engine load leveler to the engine block.
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37. Using the engine hoist, raise the engine block slightly.
38. Remove front engine mount.
39. Remove the front engine mounting bracket.
40. Remove the rear engine mount.
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41. Remove the upper transmission hardware.
42. Separate the engine from the transmission.
43. With the engine hoist and load leveler, set the engine on a flat surface.
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Transfer remaining components to the new engine block.
1. Remove the new engine block from the crate/box and set it on a clean flat surface. Prepare the new block for parts to
be transferred from original engine block.
2. Remove the engine side mounting bracket.
3. Remove and transfer knock sensor and knock sensor harness. 32 N·m(3.3 kgf·m, 24 lbf·ft)
4. Remove and transfer drive plate. (5-Speed A/T) (6-Speed A/T)
5. Remove and transfer the transmission dowel pins.
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6. Remove and transfer the front and rear engine mount brackets.
7. Remove and transfer AC compressor bracket.
8. Remove and transfer timing belt stopper, timing belt drive pulley and remove crankshaft pulley bolt.
9. Remove and transfer idler pulley.
10. Remove and transfer the timing belt adjuster.
11. Remove and transfer CKP Sensor.
12. Reinstall all removed parts in the reverse order of removal.
Engine Installation
1. With the engine hoist, lift the new engine block and line up onto the transmission.
NOTE: Make sure the dowel pins are in the transmission.
2. Install upper transmission hardware.
3. Install the front and rear engine mount and bracket.
4. Remove the engine hoist.
5. Re-install the right driveshaft and driveshaft base. Driveshaft Installation
6. Install A/C compressor bracket.
7. Install the water pipe with new O-rings onto the engine block.
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8. Install front and rear cylinder heads.
FOR CYLINDER HEAD INSTALLATION
NOTE: The crankshaft and camshafts should be set to TDC. Below are the steps for cylinder head bolt torque
specifications:
1. Apply new engine oil to the threads and under the bolt heads.
2. Torque the cylinder bolts in sequence to 29 N•m (22 lb-ft).
3. Tighten in sequence an additional 90 degrees (third step).
4. Tighten in sequence an additional 90 degrees (fourth step).
5. If the bolts are new, tighten an additional 90 degrees.
Cylinder Head Bolt Installation Sequence
9. Install timing belt, engine side mount, timing covers and crank pulley (Click Here).
10. Install crankshaft pulley.
11. Perform valve clearance check and adjust.
12. Install valve covers.
13. Install water passage with new water passage gaskets.
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14. Install fuel joint pipe with new O-rings.
15. Connect engine wire harness connectors.
16. Install the connector bracket to the front cylinder head, tighten the bolt to the specified torque.
17. Install the harness bracket to the rear cylinder head, tighten the bolt to the specified torque.
18. Install intake manifold with new intake manifold gasket, upper cover and new upper cover gasket.
19. Install front and rear catalytic converter.
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20. Install rear engine mount stop and heat shield, torque bolts to 93 N·m (9.5 kgf·m, 69 lbf·ft).
21. Install starter assembly.
22. Install EGR pipe.
23. Install ignition coils and connectors.
Engine and Transmission Going into the Vehicle.
1. Line up the engine lift table and subframe under the vehicle.
2. Raise the lift table while lining up the subframe holes on bottom of the vehicle.
NOTE: Use positioning tool if needed (P/N - 070AG-SJAA10S) to line up subframe before hardware installation.
3. Install the subframe with new main subframe mounting bolts.
4. Torque subframe bolts to specification onto the vehicle.
NOTE: Be careful not to damage any wire harness connectors, hoses, A/C compressor when installing the subframe.
5. Install a new oil filter.
6. Reinstall all removed parts in the reverse order of removal.
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Engine in Vehicle
1. Install new oil filter.
2. Install lower transmission hardware. Torque the bolts to the specified torque 74 N·m (7.6 kgf·m, 54 lbf·ft).
3. Connect CKP connector and CKP bracket.
4. Attach the torque converter to the drive plate (A) with eight bolts (B). Rotate the crankshaft pulley as necessary to
tighten the bolts to half of the specified torque, then do the final torque in a crisscross pattern. After tightening the last
bolt, check that the crankshaft rotates freely. Install the torque converter cover (C).
5. Connect the front suspension stroke sensor connector (A) and install the harness clamps.
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6. Connect the rear engine mount actuator connector (A).
7. Connect front engine mount actuator connector (C).
8. Connect the PSP switch connector (A) and the heat shield bolt (B).
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9. Connect the transmission hoses (C), then secure the hose with the clamp (D):
•
•
5-speed A/T model.
6-speed A/T model.
10. Install left and right front dampers.
11. Connect the upper stabilizer links to the dampers. Torque the bolts to specified torque 79 N·m (8.1 kgf·m, 58 lbf·ft).
12. Install left and right brake caliper. Torque the bolts to the specified torque 137 N·m (14.0 kgf·m, 101 lbf·ft).
13. Install wheel speed sensors. Torque the bolts to the specified torque 9.3 N·m (0.95 kgf·m, 6.9 lbf·ft)
14. Install transmission ground. Torque the bolt to the specified torque 12 N·m (1.2 kgf·m, 9 lbf·ft)
15. Install front WU-TWC bracket, tighten the bolts to their specified torque .
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16. Install rear WU-TWC bracket, then torque the bolts to the specified torque .
17. Install exhaust pipe A with catalytic converter.
NOTE: Use new gaskets and new self-locking nuts.
18. Install front left fender liner.
19. Lower the vehicle.
20. Install the A/C compressor hardware (A), then connect the A/C compressor clutch connector (B).
21. Install alternator assembly.
22. Install drive belt auto tensioner.
23. Install the power steering pump (A), then install the bolt (B) securing the power steering hose bracket (C).
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24. Connect the power steering pump inlet hose (C) and the power steering pump outlet hose (A) with new O-ring (B) to
the power steering pump. Attach the power steering hose bracket (D). Tighten the bolts to their specified torque.
25. Install the drive belt.
26. Install the side engine mount (A) and the wire harness bracket (B). Tighten the bolts to their specified torque.
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27. Loosely install the upper half of the side engine mount bracket (A) using new bolts, then install the ground cable
bracket (B). Tighten the bolts to their specified torque.
28. Install PCM with PCM bracket.
29. Connect PCM and harness clamps.
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30. Install the PCM cover.
31. Connect the EVAP canister hose (E), the EVAP canister purge valve connector (D), the throttle actuator connector (C),
and the MAP sensor connector (B).
32. Connect the fuel feed hose (A), install the quick-connect fitting cover (B), then install hardware.
33. Install transmission shifter cable.
5 AT
6 AT
34. Install the Positive cable and nut on the starter and torque to 9.0 N·m (6.6 lbf·ft).
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35. Connect the heater hoses (A).
36. Connect the ATF Cooler Lines.
37. Connect upper and lower radiator hoses.
38. Install the battery base (A), and the harness clamps (B), then tighten the bolts (C) to 22 N·m (2.2 kgf·m, 16 lbf·ft).
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39. Install the main under-hood fuse box (A) and the harness clamps (B), then connect the engine wire harness (C) and
starter cables (D) to the main under-hood fuse box.
40. Install the air cleaner.
41. Install the engine cover.
42. Do the Battery installation procedure.
43. Lift the vehicle.
44. Install the right fender liner.
45. Install the splash shield.
46. Install the wheels.
47. Lower the vehicle.
48. Connect steering joint to steering gear box, then torque the bolt to 29 N·m (3.0 kgf·m, 21 lbf·ft).
49. Refill the engine with engine oil.
After Engine Overhaul:
5.0 L (5.3 US qt)
50. Refill the transmission with ATF:
5-speed A/T model
6-speed A/T model
51. Move the shift lever to each gear and verify that the A/T gear position indicator follows the transmission range switch.
52. Refill the reservoir with power steering fluid.
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53. Refill the radiator with engine coolant.
54. Move the shift lever to each gear and verify that the A/T gear position indicator follows the transmission range switch.
55. Inspect for fuel leaks. Turn the ignition switch to ON (II) (do not operate the starter) so the fuel pump runs for about 2
seconds and pressurizes the fuel line. Repeat this operation three times, then check for fuel leakage at any point in the
fuel line.
56. Do the PCM reset procedure.
57. Check the PCM software version P/N located above the PGM-FI Data List.
Year
Model
Program ID
37805-RV0-C010 (5AT)
37805-RV0-C110 (6AT)
2013
Odyssey
2014–16
Odyssey
37805-RV0-A660
2017
Odyssey
37805-RV0-A020
58. Do the PCM update, if needed.
NOTE: For information on updating the PCM see service bulletin 22-100 Updating Control Units/Modules with the
Honda ECU Reprogramming Application.
Is the PCM Program ID and/or Program P/N current than what is listed?
• YES – The correct software is installed
• NO – The PCM software needs to be updated
59. Do the CKP pattern clear/CKP pattern learn procedure.
60. Inspect the idle speed.
61. Do the cooling system bleeding procedure.
62. Lift the vehicle.
63. Check for fluid leaks.
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58. Lower the vehicle
59. Check the wheel alignment.
60. Perform a road test.
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- 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: A25-061
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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