P2600 — Coolant Pump A Control Circuit/Open

P2600: Coolant Pump A Control Circuit/Open — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Coolant Pump A Control Circuit/Open. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • A coolant-pump control fault may illuminate the engine warning light without immediate driving symptoms.
  • If coolant circulation is affected, cooling performance can deteriorate and engine temperature may rise.

Possible causes

  • Open wiring, poor electrical contact or a faulty relay in coolant pump A's command path.
  • A failed electric coolant pump or damaged control connections may leave the circuit unresponsive.

What to check

  • Record P2600 and any cooling-system faults; do not continue driving if overheating is indicated.
  • With the cooling system cold, inspect accessible pump wiring and connectors for damaged insulation or corrosion.
  • Use the vehicle wiring diagram to check supply, ground and command continuity, then request a pump operation test with a compatible scanner.

Also written as: P2600-00, P260000 (some scan tools add the fault-type byte, e.g. -00).