An output capacitor substitution can change regulator stability

A replacement capacitor is not defined only by its capacitance. Its electrical characteristics can affect the behaviour of the regulator it supports.

What to check next

Review the original circuit requirements and the exact replacement fitted. If a rail oscillates or the module resets after repair, compare the waveform under the relevant loads. Check soldering and connections as well as the component specification before changing more parts.

Useful information for an enquiry

Send the original and replacement markings and a record of the new symptom.

The correct capacitance, voltage rating and permitted ESR range must come from the circuit and regulator information. Bigger is not automatically better.

Speak to AXION

For ECU testing and component-level repair, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from Texas Instruments. The referenced design explains the principle; the vehicle-specific procedure determines the repair.

Related reading — Thermal shutdown in a regulator can imitate an intermittent software fault. Browse all vehicle-electronics diagnostic notes or return to the repair library.