P2459 - Particulate Filter Regeneration Frequency (Bank 1)
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Particulate Filter Regeneration Frequency (Bank 1) (P2459). The reported signal is electrically valid but disagrees with other operating parameters (RPM, load, or other sensors). Affects cylinder bank 1 (bank 1 containing cylinder 1, firewall/right side).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Particulate Filter Regeneration Frequency (Bank 1) – Signal Voltage | Voltage (V) | 0.50 - 4.50 V (tracks operating range) | Ignition ON, connector engaged |
| 5 V Reference Voltage | Voltage (V) | 4.95 - 5.05 V | Ignition ON at sensor connector |
| Sensor Ground Voltage Drop | Voltage (V) | < 0.05 V (< 50 mV) | Under load to chassis ground |
| Signal Wire Continuity | Resistance (Ω) | < 0.5 Ω (Open = OL) | Disconnected harness between sensor and ECM |
Ignition ON, connector engaged
Ignition ON at sensor connector
Under load to chassis ground
Disconnected harness between sensor and ECM
Oscilloscope Waveform Analysis
100 ms/div, 1 V/divPossible Causes
Particulate Filter Regeneration Frequency (Bank 1) is electrically operational but performing outside calibrated tolerance
Bank 1 specific:Inspect wiring harness to cylinder bank 1 (firewall/right bank, exposed to exhaust manifold heat).
Chafed or pinched wiring harness along the signal path to Particulate Filter Regeneration Frequency (Bank 1)
Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Particulate Filter Regeneration Frequency (Bank 1)
Defective internal output driver or reference circuit in the control module for Particulate Filter Regeneration Frequency (Bank 1)
Symptoms
4
Recommended Solution
Cross-swap the component on Bank 1 with Bank 2 to rule out mechanical oil passages and internal timing wear.
Log component live data across varying load points and verify plausibility against engine target model.
Verify loaded supply voltage and harness terminal pins at Particulate Filter Regeneration Frequency (Bank 1).
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Particulate Filter Regeneration Frequency (Bank 1).
Unplug the sensor:the signal must swing to a known rail. Replace the sensor or repair the wiring based on the result.
Mechanic's Tip
Always run a loaded voltage-drop test on the sensor ground with ignition ON. A drop above 0.1 V shifts the whole signal and tricks the module into setting sensor codes on a good sensor.
Affected ECU families
Related Fault Codes
Exhaust Temperature Too Low For Particulate Filter Regeneration (Bank 2)
Oxygen Sensor (O2) Signals Swapped Bank 2 Sensor '2' / Bank 2 Sensor '3'
Evaporative Emission System (EVAP) Leak Detection Pump Pressure Sensor Range/Performance
Exhaust Gas Temperature Sensor (EGT) Circuit (Bank 1 Sensor '3')