Honda ECU, PCM, ECM, Engine & Car Computer Replacement

Honda Accord (4) ECM/PCM   |   TCM

Honda Accord Transmission and Engine Control Modules

Car Computer Exchange rebuilds and ships Honda Accord transmission control modules for the 1990 through 1993 model years. Each TCM is remanufactured, tested on a vehicle simulator, and programmed to the buyer's VIN before it leaves the facility in Raleigh, NC.

The Accord is the current Honda model in the catalog, with four year-specific TCMs covering the early 1990s. Honda engine computer modules from this era fail from capacitor degradation and solder fatigue after decades of thermal cycling. If your scan tool points to the transmission control module and your Accord falls in the 1990-1993 range, the product grid above lists the exact replacement. Car Computer Exchange has 4,500+ verified customer reviews across 12 makes and 2,746 product pages.

Honda PCM, ECM, and ECU: What Honda Calls Its Engine Computer

Honda labels the engine computer as an ECM (engine control module) in its OEM part numbering, using the 37820-xxxxx format. The terms PCM (powertrain control module), ECU (electronic control unit), engine computer, and car computer all describe the same type of unit. Honda service documentation defaults to "ECM," while aftermarket sellers use all five terms interchangeably.

The distinction that matters for replacement is whether your Honda needs an ECM (engine only) or a TCM (transmission only). Some Honda models use a single powertrain control module for both functions. Browse Toyota ECM modules and Lexus ECM modules for additional import make coverage from Car Computer Exchange.

Honda ECM Failure Symptoms and Diagnostic Codes

A failing Honda ECM typically triggers a check engine light with internal fault codes, random misfires, stalling, or a crank-no-start condition. Common diagnostic codes that point to a Honda engine control module failure:

• P0600: Serial communication link malfunction
• P0601: Internal control module memory checksum error
• P0602: Control module programming error
• P0605: Internal control module ROM error

If the code returns after a scan tool clear and you have already checked sensors and wiring, the ECM itself is the likely source. Honda's immobilizer system adds another factor: a replacement ECM that has not been reprogrammed with the vehicle's immobilizer data will not start the engine. Car Computer Exchange programs every Honda module with the buyer's VIN and immobilizer codes before shipping, the same process used across Ford, Dodge, Jeep, and Chrysler modules.

Every Honda Module Ships VIN-Programmed with a 13-Point Quality Check

Honda's immobilizer system ties the ECM to the ignition switch and key transponder. A replacement module that has not been coded with the vehicle's immobilizer data will crank but refuse to start. Car Computer Exchange programs every Honda module with your VIN, key transponder codes, and anti-theft data before shipping. No dealer visit. No Honda HDS scan tool. No separate programming fee.

The 1990-1993 Accord TCMs in the product grid above are pre-OBD2 units. Each one completes a 13-point quality check on a computer-aided vehicle simulator that loads your Honda's specific engine, transmission, emissions, and anti-theft parameters before the module ships.

Car Computer Exchange backs every Honda module with a free lifetime warranty activated by returning the old core within 21 days. The 60-day guarantee covers returns if the module does not solve the issue. Honda joins 12 supported makes, with over 150,000 modules shipped since 2011.

FAQs

What is the difference between a Honda ECU, PCM, and ECM?

All three terms describe the same type of module. Honda uses "ECM" (engine control module) in its OEM part numbers, which follow the 37820-xxxxx format. "ECU" is a general industry term for any electronic control unit. "PCM" (powertrain control module) technically refers to a unit managing both engine and transmission. Car Computer Exchange matches the exact module to your Honda's VIN regardless of which term you search.

Does a replacement Honda ECM need to be reprogrammed?

Yes. Honda's immobilizer system requires the ECM, ignition switch, and key transponder codes to match before the engine will start. A replacement ECM without programmed immobilizer data locks out the vehicle. Car Computer Exchange programs every Honda module with your VIN and immobilizer codes before shipping. No dealer visit, no Honda HDS scan tool, no additional fee.

What are the symptoms of a bad Honda engine computer?

Common symptoms include a check engine light with codes P0600 through P0605, random misfires, stalling at idle, crank-no-start, erratic transmission shifting, and sudden drops in fuel economy. If the codes return after a scan tool clear and you have already replaced sensors and ignition coils, the engine control module itself is the likely failure point.

How much does it cost to replace a Honda ECM?

Dealer replacement for a Honda ECM runs $800 to $2,000 or more, covering the part, labor, and a separate programming fee. A remanufactured, VIN-programmed module from Car Computer Exchange ships ready to install with no programming fee and no dealer labor required. Free lifetime warranty with core return. Enter your year, make, and model to see current pricing for your vehicle.