Engine Control Unit IAW 48P2.7H 9646570280 9645989480 1938VY

Description

Control Unit Magneti Marelli IAW 48P2.7H From a Citroën C2 1.1i

Original Magneti Marelli engine control unit (ECU) IAW 48P2.7H suitable as a direct replacement for vehicles using these hardware references. This ECU manages fuel injection and ignition timing on compatible petrol engines and is a cost-effective option for professional workshops and DIY mechanics searching by part number (IAW 48P2.7H, 9646570280, 9645989480, 1938VY). The unit restores correct engine management behaviour when faults are traced to a defective control module and can significantly reduce diagnostic time when fitted and coded correctly.

Technical information

• Manufacturer: Magneti Marelli
• Model: IAW 48P2.7H
• Product Codes: 9646570280, 9645989480, 1938VY
• Additional Numbers: 1938VY (as supplied)

Compatibility

Originally fitted to: Citroën C2 1.1i (source vehicle). This ECU family is also found on some small PSA petrol models; compatibility should be checked against the listed product codes. Common search keywords: Citroën C2 ECU, Magneti Marelli IAW 48P2.7H, 9646570280.

Replacement procedure

High-level replacement steps for experienced technicians:

• Disconnect the negative battery terminal and wait per manufacturer recommendations.
• Locate the ECU (typically under the dashboard, in the engine bay, or behind a trim panel depending on model).
• Remove trim or covers, unfasten mounting screws, and carefully unplug all electrical connectors.
• Swap the unit and refit connectors and mounts securely.
• Perform cloning or coding as required before initial start (see Installation and coding – important).

Installation Recommendations

• Handle the ECU as an electrostatic-sensitive device; avoid touching connector pins directly.
• Always disconnect the battery before removal/installation to prevent short circuits and memory corruption.
• Inspect wiring, connectors and earth points for corrosion or damage before fitting the replacement unit.
• Use authorised diagnostic tools for coding or adaptation to ensure reliable commissioning.

Installation and coding – important

• The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
• Commissioning options:
  1. Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
  2. Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
• Recommended to be performed by a specialist with PSA service equipment (DiagBox/Lexia/PP2000).
• Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damaging the unit.

Why this part fails most often

• Water ingress or moisture leading to connector corrosion and PCB damage.
• Voltage spikes or poor battery/charging system resulting in blown components or corrupted memory.
• Poor grounding or damaged wiring causing intermittent faults.
• Age-related wear, thermal cycling and failed solder joints or components on the board.

If you are a professional mechanic or a competent DIYer and you recognise the product codes above, this Magneti Marelli IAW 48P2.7H unit can be a practical replacement to restore engine management functions — provided the unit is correctly cloned or coded and installed following the recommended procedures.