GENUINE HONDA OEM REPLACEMENT
Honda Part #38770-MCA-P00 is the updated genuine Honda PGM-FI engine control unit for 2001–2003 Honda Gold Wing GL1800 and GL1800A motorcycles. This OEM replacement supersedes several earlier ECU part numbers and restores the factory engine-management system when the original control module has failed.
Experiencing FI Code 25 or Code 26? Early Honda Gold Wing GL1800 models are known for ECU-related knock sensor fault issues. Replacing a confirmed faulty ECM with this genuine Honda replacement can resolve ECU-caused Code 25 and Code 26 problems.
Honda part 38770-MCA-P00 supersedes earlier factory ECU numbers, providing the cataloged OEM replacement for applicable 2001–2003 Gold Wing models.
A replacement solution for confirmed ECM failures involving right or left knock sensor diagnostic trouble codes, commonly reported on early GL1800 motorcycles.
Factory Honda PGM-FI engine-management hardware designed for the specified GL1800 application, rather than a universal aftermarket control module.
Owners of early Honda Gold Wing GL1800 motorcycles may encounter a flashing FI warning light accompanied by Code 25 or Code 26. These diagnostic codes identify problems involving the engine's knock sensor circuits.
FI CODE 25
Right Knock Sensor Circuit
Indicates a fault involving the right-side knock sensor circuit. Potential causes include sensor failure, wiring problems, poor electrical connections, or a defective ECU.
FI CODE 26
Left Knock Sensor Circuit
Indicates a fault involving the left-side knock sensor circuit. As with Code 25, the cause may be the sensor, wiring, connectors, or an internal ECM problem.
A common frustration with these older Gold Wing motorcycles is an FI knock sensor fault that persists even after the knock sensor and wiring have been inspected or replaced. In some cases, the problem originates inside the engine control module rather than at the sensor itself.
When diagnostic testing confirms an internal ECU failure, replacing the original ECM with Honda 38770-MCA-P00 provides the genuine OEM replacement solution for the affected 2001–2003 GL1800 application.
Diagnostic note: FI Codes 25 and 26 do not automatically mean the ECU is defective. The knock sensors, electrical connectors, and wiring should be checked according to the Honda service manual before replacing the control module. ECU replacement is not a guaranteed repair for every Code 25 or 26 condition.
The Honda 38770-MCA-P00 PGM-FI Unit supersedes the following earlier Honda OEM engine control modules. Owners searching for these discontinued or superseded ECU numbers can use the updated part number when confirmed for their motorcycle.
| Original Honda Part Number | Replacement |
|---|---|
| 38770-MCA-A01 | 38770-MCA-P00 |
| 38770-MCA-A00 | 38770-MCA-P00 |
| 38770-MCA-751 | 38770-MCA-P00 |
| 38770-MCA-671 | 38770-MCA-P00 |
This genuine Honda PGM-FI engine control unit is listed for the following Honda Gold Wing motorcycles:
| Model Year | Honda Model | Application |
|---|---|---|
| 2001 | GL1800 / GL1800A | Gold Wing |
| 2002 | GL1800 / GL1800A | Gold Wing |
| 2003 | GL1800 / GL1800A | Gold Wing |
Fitment shown reflects known Honda OEM catalog applications. Verify the part number against the specific motorcycle's VIN and OEM parts diagram before ordering. Compatibility with other model years is not implied.
Manufacturer: Honda
Part Number: 38770-MCA-P00
OEM Catalog Name: PGM-FI UNIT
Part Type: Engine Control Module (ECM / ECU)
OEM Assembly: Control Unit
Application: Honda Gold Wing GL1800 / GL1800A
Model Years: 2001, 2002, 2003
It can resolve these codes when the fault is caused by a defective original ECU. However, a bad knock sensor, damaged wiring, or poor connection can produce the same warning. Proper diagnosis is recommended before replacement.
Yes. Honda's OEM parts catalogs identify 38770-MCA-P00 as the replacement for several earlier 2001–2003 GL1800 PGM-FI unit part numbers, including 38770-MCA-A00, 38770-MCA-A01, 38770-MCA-751, and 38770-MCA-671.
This ECU is cataloged for the GL1800 and GL1800A Gold Wing models for all three model years. Always verify the correct OEM part for your exact motorcycle before purchasing.
This is the PGM-FI engine control module, not an individual knock sensor. It is responsible for electronic engine-management functions and processing inputs from engine sensors.
If your 2001–2003 Honda GL1800 has a confirmed ECU failure, choose the genuine Honda 38770-MCA-P00 PGM-FI Unit for a factory-specified replacement.
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