P25BB

Regeneration Control Switch Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Inability to start forced DPF regeneration
DPF error message on the dashboard

Causes

Open or short circuit in wiring harness
Regeneration switch malfunction
Poor contact in wiring connectors
Problems with the engine control unit
Corrosion of contacts in the control circuit

How to Fix

Check the integrity of the wiring and connectors in the control circuit
Test the regeneration switch for malfunctions
Check control circuit voltage
If necessary, replace the switch or damaged wires
Reset the error code and check the system after repair

Related codes

P25BC P25BD P2459