Code
P2459
Generic
P — Powertrain
Particulate Filter Regeneration Frequency Bank 1
Views:
UK: 41
EN: 46
RU: 32
AI status
Completed
Completed
100%
Causes
- Frequent short trips / low-speed driving preventing full passive regeneration
- Excessive soot production from fuel system issues (leaky injectors, rich running)
- Faulty or out-of-spec DPF differential pressure sensor or temperature sensors
- Exhaust leaks upstream of the pressure sensor or DPF
- Restricted or damaged DPF (partial blockages)
- Faulty turbocharger (insufficient boost) or boost leaks increasing soot production
Symptoms
- Frequent active/forced regenerations observed
- Illuminated Check Engine, DPF or Service Engine Soon lamp
- Increased fuel consumption from repeated active regenerations
- Reduced engine performance or limp mode if DPF becomes heavily loaded
- Noticeable diesel odor, smoke or unusual exhaust soot
- Regeneration-in-progress warnings or refusal to complete regeneration
What to check
- Read stored codes and freeze frame data; note related codes (EGR, fuel, turbo, sensors)
- Check the number and interval of recent DPF regenerations via live data / service tool
- Inspect DPF differential pressure sensor, temperature sensors and their hoses/wiring for damage or blockage
- Visually inspect exhaust for leaks upstream of the DPF and sensor locations
- Check for signs of excessive soot around exhaust components or leaks
- Measure boost pressure and check for boost leaks or turbo faults
Signal parameters
- DPF differential pressure (mbar or kPa) — typical idle low value, rises under load; compare before/after DPF (expected low at idle, higher under load)
- DPF inlet/outlet temperature (°C) — inlet should be higher during regeneration; compare expected ramp during active regen
- Soot mass or soot load estimate (grams) if available from ECU
- Number of regenerations and time between regenerations (events/km or events/hour)
- Commanded vs actual active regeneration status (PCM regen request flag)
- Boost pressure / turbo boost (kPa or psi) — low boost can increase soot
Diagnostic algorithm
- Retrieve all DTCs, freeze frame and live data. Note related codes (EGR, injectors, boost, sensors).
- Inspect differential pressure sensor, temperature sensors, sensor hoses and connectors for damage, clogging or exhaust leaks. Repair or replace as required.
- Check for exhaust leaks upstream of sensors/DPF; repair any leaks and retest sensor readings.
- Compare DPF differential pressure and temperatures at idle and during load using a scan tool; verify values change as expected and that regen events correlate with soot/load.
- Verify PCM commanded regen operations and whether active regenerations complete successfully. Force an active regen (service tool) while monitoring inlet/outlet temps, differential pressure and EGR/boost behavior.
- If excessive soot production is suspected, inspect turbocharger, boost hoses, EGR system and fuel injectors for faults; test fuel pressure and injector spray patterns.
- If sensor signals are out of range or intermittent, replace the differential pressure sensor or temperature sensors and clear codes; retest under equivalent drive conditions.
- If DPF remains heavily restricted after correcting upstream causes, perform professional DPF cleaning or replacement per manufacturer procedures.
- After repairs, clear codes and perform a test drive or monitored regen cycle to confirm normal regeneration frequency and that P2459 does not return.
Likely causes
- Soot accumulation in DPF from short-trip use or rich-running condition
- Faulty DPF differential pressure sensor or sensor plumbing (blocked hose)
- Exhaust leak between cylinders and pressure sensor causing incorrect readings
- Fuel system or injectors producing excessive soot (most likely on diesels)
Fault status
Status
PCM detected higher-than-expected DPF regeneration frequency on Bank 1 — indicates elevated soot accumulation, sensor/system fault, or driving conditions preventing normal passive regeneration.
Repair difficulty: Medium
Diagnostic time: 1.5 - 4 hours
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Code
P2459
LAND ROVER
P — Powertrain
Diesel particulate filter regeneration frequency
Views:
UK: 27
EN: 18
RU: 12
AI status
Completed
Completed
100%
Causes
- Frequent short trips / low-speed driving preventing full passive regeneration
- Excessive soot production from fuel system issues (leaky injectors, rich running)
- Faulty or out-of-spec DPF differential pressure sensor or temperature sensors
- Exhaust leaks upstream of the pressure sensor or DPF
- Restricted or damaged DPF (partial blockages)
- Faulty turbocharger (insufficient boost) or boost leaks increasing soot production
Symptoms
- Frequent active/forced regenerations observed
- Illuminated Check Engine, DPF or Service Engine Soon lamp
- Increased fuel consumption from repeated active regenerations
- Reduced engine performance or limp mode if DPF becomes heavily loaded
- Noticeable diesel odor, smoke or unusual exhaust soot
- Regeneration-in-progress warnings or refusal to complete regeneration
What to check
- Read stored codes and freeze frame data; note related codes (EGR, fuel, turbo, sensors)
- Check the number and interval of recent DPF regenerations via live data / service tool
- Inspect DPF differential pressure sensor, temperature sensors and their hoses/wiring for damage or blockage
- Visually inspect exhaust for leaks upstream of the DPF and sensor locations
- Check for signs of excessive soot around exhaust components or leaks
- Measure boost pressure and check for boost leaks or turbo faults
Signal parameters
- DPF differential pressure (mbar or kPa) — typical idle low value, rises under load; compare before/after DPF (expected low at idle, higher under load)
- DPF inlet/outlet temperature (°C) — inlet should be higher during regeneration; compare expected ramp during active regen
- Soot mass or soot load estimate (grams) if available from ECU
- Number of regenerations and time between regenerations (events/km or events/hour)
- Commanded vs actual active regeneration status (PCM regen request flag)
- Boost pressure / turbo boost (kPa or psi) — low boost can increase soot
Diagnostic algorithm
- Retrieve all DTCs, freeze frame and live data. Note related codes (EGR, injectors, boost, sensors).
- Inspect differential pressure sensor, temperature sensors, sensor hoses and connectors for damage, clogging or exhaust leaks. Repair or replace as required.
- Check for exhaust leaks upstream of sensors/DPF; repair any leaks and retest sensor readings.
- Compare DPF differential pressure and temperatures at idle and during load using a scan tool; verify values change as expected and that regen events correlate with soot/load.
- Verify PCM commanded regen operations and whether active regenerations complete successfully. Force an active regen (service tool) while monitoring inlet/outlet temps, differential pressure and EGR/boost behavior.
- If excessive soot production is suspected, inspect turbocharger, boost hoses, EGR system and fuel injectors for faults; test fuel pressure and injector spray patterns.
- If sensor signals are out of range or intermittent, replace the differential pressure sensor or temperature sensors and clear codes; retest under equivalent drive conditions.
- If DPF remains heavily restricted after correcting upstream causes, perform professional DPF cleaning or replacement per manufacturer procedures.
- After repairs, clear codes and perform a test drive or monitored regen cycle to confirm normal regeneration frequency and that P2459 does not return.
Likely causes
- Soot accumulation in DPF from short-trip use or rich-running condition
- Faulty DPF differential pressure sensor or sensor plumbing (blocked hose)
- Exhaust leak between cylinders and pressure sensor causing incorrect readings
- Fuel system or injectors producing excessive soot (most likely on diesels)
Fault status
Status
PCM detected higher-than-expected DPF regeneration frequency on Bank 1 — indicates elevated soot accumulation, sensor/system fault, or driving conditions preventing normal passive regeneration.
Repair difficulty: Medium
Diagnostic time: 1.5 - 4 hours
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