P2455 – Diesel Particulate Filter Pressure Sensor Circuit Intermittent

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit Intermittent

Definition source: SAE J2012/J2012DA (industry standard)

P2455 indicates the powertrain control module has detected an intermittent electrical condition in the diesel particulate filter (DPF) pressure sensor circuit. “Intermittent” means the signal or circuit integrity is unstable—dropping out, spiking, or becoming unreliable—rather than being consistently high, low, or open. This DTC does not, by itself, prove the DPF is restricted or that a specific component has failed; it points to a circuit/signal reliability problem that must be verified with testing. DTC behavior, enabling criteria, and default strategies vary by vehicle, so confirm exact diagnostics in the applicable service information.

What Does P2455 Mean?

P2455 – Diesel Particulate Filter Pressure Sensor Circuit Intermittent means the vehicle detected an intermittent fault in the electrical circuit used to transmit the diesel particulate filter pressure sensor signal. Under SAE J2012 DTC conventions, the code identifies the affected system and the nature of the detected malfunction; here, the key qualifier is “circuit intermittent,” indicating the control module is seeing an unstable, inconsistent, or momentary loss of a valid circuit signal rather than a steady out-of-range condition.

Quick Reference

• System: Powertrain
• Official meaning: Diesel Particulate Filter Pressure Sensor Circuit Intermittent
• Standard: ISO/SAE Controlled
• Fault type: Circuit Intermittent
• Severity: MIL illumination is possible; intermittent sensor circuit faults can trigger reduced power strategies and disrupt emissions control operation, with drivability impacts depending on vehicle strategy.

Symptoms

• MIL/Check engine light: Lamp may illuminate intermittently or stay on after repeated faults are detected.
• Reduced power: Engine torque may be limited if the control module cannot rely on DPF pressure feedback.
• Regeneration disruption: Regeneration may be delayed, inhibited, or commanded more frequently due to unstable pressure input.
• Erratic running: Hesitation, surging, or inconsistent throttle response may occur when the signal drops in and out.
• Inconsistent readings: Scan-tool data for DPF differential/pressure may flicker, spike, or momentarily go invalid during operation.
• Increased fuel consumption: Fuel economy may worsen if control strategies compensate for unreliable pressure information.
• Intermittent drivability warnings: Driver messages related to emissions or powertrain performance may appear and disappear with the fault.

Common Causes

• Intermittent wiring open: Broken conductors inside insulation, harness chafing, or a partially cut signal/return wire that opens with vibration or engine movement.
• Loose or contaminated connector: Poor terminal tension, corrosion, moisture intrusion, or connector damage at the sensor or ECM/PCM causing momentary signal dropouts.
• Poor ground path: Intermittent ground at the sensor ground splice, ground eyelet, or ground pin fit leading to unstable sensor output.
• Intermittent reference supply: Momentary loss/instability of the sensor’s regulated reference feed due to wiring faults, connector issues, or shared-circuit problems.
• Pin fit or terminal fretting: Micromovement at terminals creating brief high resistance and signal noise, often worse over bumps or during thermal expansion.
• Sensor internal intermittency: An internal fault within the Diesel Particulate Filter pressure sensor that causes sporadic dropouts or erratic output without a consistent hard failure.
• Harness routing/strain: Wiring too tight, pulled, or routed near heat/edges causing intermittent contact as components move or temperatures change.
• ECM/PCM connector or internal issue: Less common, but intermittent contact at the control module connector or an internal fault can mimic a circuit-intermittent condition.

Diagnosis Steps

Useful tools include a scan tool capable of reading freeze-frame and live data, a multimeter for power/ground and voltage-drop checks, and basic back-probing leads. A wiring diagram and connector pinout from service information are important because circuit layout varies by vehicle. If available, use a scan tool logging function to capture brief dropouts during a road test.

1. Confirm the DTC and context: Verify P2455 is present. Record freeze-frame data and all stored/pending codes. Note when it sets (idle, cruise, acceleration, regen-related operation, bumps), since intermittent faults are often condition-dependent.
2. Check for related electrical codes: If other sensor reference, ground, or communication codes are present, diagnose those first. A shared reference/ground issue can create intermittent behavior across multiple sensors.
3. Initial visual inspection (engine off): Inspect the pressure sensor connector, nearby harness routing, and loom condition. Look for rub-through, melted sections, stretched wiring, missing retention clips, or signs of moisture/corrosion at terminals.
4. Connector integrity checks: Disconnect the sensor connector and inspect terminals for spread pins, pushed-back terminals, discoloration, corrosion, or water intrusion. Verify the connector locks positively and that the harness isn’t pulling the connector sideways.
5. Wiggle test with live data: With the scan tool on live data, monitor the Diesel Particulate Filter pressure sensor signal while gently wiggling the sensor connector, harness sections, and related splices (one area at a time). Watch for sudden dropouts, spikes, or implausible jumps that coincide with movement.
6. Power/ground verification (key on, as applicable): Using the wiring diagram, verify the sensor’s reference feed and ground at the sensor connector. Do not rely on a test light alone; use a multimeter and compare to service information specs. If the feed or ground is unstable during harness movement, isolate the affected section.
7. Voltage-drop test under load: Perform voltage-drop testing on the sensor ground circuit and the reference/feed circuit while the circuit is operating. Apply gentle harness movement and observe for intermittent increases in drop that indicate resistance from fretting, corrosion, or a failing splice.
8. Continuity and intermittent open checks (circuit isolated): If voltage-drop points to a wiring issue, isolate the circuit (per service information) and check continuity end-to-end, including from the sensor connector to the control module connector. Flex the harness during the test to reproduce an intermittent open; focus on bend points and areas near brackets.
9. Signal circuit evaluation: If power and ground are stable, focus on the signal wire. Check for intermittent short-to-ground or short-to-power behavior by inspecting for chafing and performing appropriate isolation tests per wiring diagrams. Intermittent shorts often correlate with engine movement or vibration.
10. Live-data logging road test: If the fault is difficult to reproduce . A brief drop to an implausible value or a sharp spike that coincides with bumps strongly suggests a connection or harness issue.
11. Rule-in/rule-out the sensor: If the wiring, terminals, and supply/ground remain stable through wiggle testing and voltage-drop testing, and the signal still shows intermittent dropouts, suspect an internal sensor intermittency. Replace only after confirming the circuit integrity and connector condition.
12. Verify the repair: After repair, clear codes and repeat the conditions that previously triggered the fault (including a similar route if road-tested). Recheck for pending codes and confirm the live signal remains stable during vibration and thermal changes.

Professional tip: Intermittent circuit faults are often caused by terminal tension or fretting rather than a fully broken wire. If a wiggle test changes the signal but visual inspection looks “clean,” prioritize pin-fit checks, gentle terminal drag tests (per service procedures), and voltage-drop testing while moving the harness; these methods find high-resistance faults that continuity tests can miss.

Last updated: February 19, 2026

Possible Fixes & Repair Costs

Repair costs for P2455 vary widely because an intermittent circuit fault can be caused by wiring, connectors, sensor issues, or power/ground problems. Total cost depends on the time required to reproduce the intermittent condition, confirm the root cause, and replace or repair only the failed part.

• Repair wiring damage: Repair chafed, stretched, pinched, or heat-damaged sections of the DPF pressure sensor signal, reference, and return circuits as confirmed by testing.
• Service connectors and terminals: Clean corrosion, correct poor terminal tension, reseat loose pins, repair broken locks, and restore weather seals to prevent recurring intermittents.
• Restore power and ground integrity: Repair high-resistance power feeds, grounds, splices, or shared ground points found by voltage-drop testing under load.
• Replace the DPF pressure sensor: Replace only if verified to intermittently drop out, spike, or lose communication at the sensor while wiring and supplies remain stable.
• Secure harness routing: Re-route and properly clip the harness to prevent vibration-induced opens/shorts, rub-through, and strain at the sensor connector.
• Repair related circuit faults: Address intermittent issues in reference-voltage or sensor-return networks that affect multiple sensors, if confirmed by scan data and pinpoint tests.

Can I Still Drive With P2455?

You can sometimes drive with P2455 if the vehicle is operating normally, but an intermittent DPF pressure sensor circuit may cause unpredictable warning lights, reduced-power behavior, or regeneration strategy changes depending on vehicle design. If you experience stalling, no-start, severe hesitation, sudden loss of power, or any safety-related warnings, do not drive; have the vehicle inspected and the circuit fault confirmed with proper diagnostics.

What Happens If You Ignore P2455?

Ignoring P2455 can lead to recurring MIL illumination, intermittent drivability complaints, and repeated regeneration-related strategy interruptions that vary by vehicle. Over time, an unresolved intermittent circuit can become a hard failure (open/short) and may complicate diagnosis by creating inconsistent data, increasing the chance of unnecessary parts replacement, and potentially contributing to poor performance or higher exhaust-system stress.

Vehicles Commonly Affected by P2455

• Diesel-equipped vehicles with a DPF system: Any platform using a DPF pressure sensor feedback circuit can set this code.
• High-mileage applications: Harness wear, connector fretting, and terminal tension loss are more common as mileage accumulates.
• Vehicles used on rough roads: Vibration can trigger intermittent opens at connectors, splices, or sensor terminals.
• Cold-climate or wet-environment operation: Moisture intrusion and corrosion can cause intermittent contact at terminals and grounds.
• Vehicles with recent exhaust or underbody service: Harness strain, misrouting, or partially seated connectors may be introduced during repairs.
• Work-use duty cycles: Frequent heat cycles and extended run times can accelerate insulation hardening and connector seal degradation.
• Vehicles with prior wiring repairs: Poor-quality splices, unsealed repairs, or incorrect routing can create recurring intermittent faults.
• Vehicles with rodent exposure: Intermittent contact from partially damaged conductors can occur before a complete open develops.

If P2455 is recurring, prioritize verifying connector seating, terminal tension, and harness routing near heat and vibration sources, since many intermittent circuit faults are corrected by restoring reliable electrical contact rather than replacing major components.