A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
Engine control unit Honda Civic 37820-P04-G03 37820P04G03
Vendors's code: 37820P04G03
Product code: 37820-P04-G03
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
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Engine control unit Honda Civic 37820-P04-G03 37820P04G03
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Looking for the 37820-P04-G03 ECU for your Honda Civic?
This is a used, working engine ECU marked 37820-P04-G03 and 37820P04G03. We always confirm the fit against the label. Ask us about preparation for fitting before you buy.
Engine control unit Honda Civic 37820-P04-G03 37820P04G03
This used 37820-P04-G03 engine computer for the Honda Civic processes sensor signals and calculates the engine’s operating parameters.
ECU markings
- 37820-P04-G03 – Honda part number
- 37820P04G03 – the same number without the dash
Compare them with the sticker on the ECU in your car. The number decides the fit, not the model alone – Honda used different ECU versions.
Symptoms of a faulty engine ECU
- the starter cranks but the engine does not fire,
- the diagnostic tool cannot connect to the ECU,
- an engine warning light and fault codes that remain after replacing sensors,
- signs of moisture or corrosion on the connectors or circuit board.
Before replacing the ECU, check the power supply, earths and wiring loom – a damaged wire or connector can cause similar symptoms.
Preparation for fitting
A used engine ECU usually has to be programmed and matched to the car’s immobiliser.
Before ordering, ask us about the preparation options for the 37820-P04-G03 unit and send us the numbers from the label of your ECU.
All variants are described on our Locked & Unlocked ECUs page.
Frequently asked questions
| Will the ECU start the engine straight after fitting? |
|---|
| A used ECU usually needs programming and matching to the immobiliser. Ask us about the preparation options before purchase. |
| What details should I send before ordering? |
| All the numbers from the label of your current ECU, or a clear photo of it. Based on that, we will check the fit and the possible variants. |
| Can I fit an ECU with a different number suffix? |
| A different suffix can mean a different software or hardware version. Send us a photo of the label and we will check whether the 37820-P04-G03 ECU is suitable. |
Need help choosing? Contact us at contact@auto24parts.com.
