Description
Transmission Control Unit for Citroën C5 and Peugeot 607 2.2 HDi (4HX, 98 kW)
This Bosch transmission control unit (TCU) is designed for Citroën C5 and Peugeot 607 vehicles equipped with the 2.2 HDi 4HX 98 kW engine. It restores proper gearbox management, ensuring smooth gear changes, correct torque converter operation and reliable communication with engine and transmission sensors. The unit is ideal for professional workshops and experienced DIY mechanics who need an OEM-compatible replacement identified by common part numbers.
Key Benefits
– Direct fit for matched models: reduces diagnostic time and parts hunting.
– Restores automatic shifting quality and responsiveness.
– Searchable by multiple product numbers often used in service and parts databases.
Typical Symptoms Indicating TCU Fault
- Harsh, delayed or slipping gear changes.
- Transmission stuck in limp mode or limited gear range.
- Illuminated gearbox or engine warning lamp related to transmission faults.
- Intermittent loss of communication with gearbox sensors (erratic behavior).
Why This Part Fails Most Often
Transmission control units can fail due to a combination of environmental and electrical factors: moisture ingress and corrosion compromising connectors or PCB solder joints, thermal stress from repeated heating and cooling cycles, or damage caused by short circuits in wiring and sensors. Contaminated transmission fluid or failing sensors can also place excessive load on the unit and accelerate failure.
Installation Recommendations
- Disconnect the battery before starting work and follow vehicle manufacturer procedures.
- Inspect connector pins and harness for corrosion or damage; clean and repair as needed before fitting the new unit.
- Ensure the mounting surface and seals are clean and dry to prevent moisture ingress.
- After installation clear related fault codes and perform gearbox adaptations or learning procedures with a suitable diagnostic tool; verify correct operation with a test drive under various load conditions.
- Use appropriate ESD precautions when handling the control unit to avoid electronic damage.
Technical Information
- Manufacturer: Bosch
- Model: Citroën C5; Peugeot 607 – 2.2 HDi (engine code 4HX), 98 kW
- Product Codes: 0260002767
- Other Numbers: 9641281180, 9643703380, 9641281280, 2529L8
Fitment And Application Notes
Fits Citroën C5 and Peugeot 607 with the 2.2 HDi 4HX 98 kW powertrain when one of the listed part numbers is referenced. Always verify the part number stamped on the original unit before ordering to ensure direct compatibility.
Service Tips For Mechanics
When replacing the TCU check the transmission fluid condition and level, inspect solenoid packs and wiring for shorts or grounding issues, and confirm sensor outputs (speed sensors, pressure sensors) are within specification. Many shift and communication faults are caused or exacerbated by related component failures—address root causes to prevent repeat failures.
