Short guide: ABS/ESP — pump, lost communication and warning lights
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Practical summary: symptoms, exterior checks and data to assess ABS/ESP control unit.
Qué ocurre
ABS/ESP warning lamp on or flashing; erratic ABS interventions; sometimes handbrake/electronic parking brake affected. Fault memory unreadable or “no communication” messages.
Qué conviene comprobar
Check ABS fuses and relays; battery voltage and terminals; connector wiring and contact condition; listen for pump noise at start-up; visually inspect wheel speed sensors and wiring for damage or contamination.
El siguiente paso
Gather: full DTC list, supply voltages (battery resting and cranking), sensor signal captures if available, photo of ECU connector and ECU part number. If communication faults remain, consider bench evaluation of the module.
