Diesel Particulate Filter Pressure Sensor A Circuit Intermittent
The P2456 code means the vehicle's onboard diagnostic system has detected: Diesel Particulate Filter Pressure Sensor A Circuit Intermittent. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
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Common Symptoms
- Check Engine Light on, possibly intermittent
- Fault may come and go with vibration or temperature
Probable Causes (Ranked by Likelihood)
- Intermittent wiring fault — chafed insulation or a loose terminal Very High
- Failing sensor with an intermittent internal fault Moderate
Step-by-Step Diagnostic Procedure
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Intermittent circuit faults are wiring until proven otherwise: flex the harness and connector while watching live data.
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Pay attention to where the harness passes brackets or hot components near the exhaust.
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Meaning corroborated against this site's independently researched diesel-family pages for the same code (Kubota (single witness, completes the sequence P2453-P2455; treat make-specifics with the usual caution)).
Frequently Asked Questions
The code clears itself and returns — why?
That is what an intermittent circuit fault looks like. The wiring makes and loses contact with vibration or heat cycles. Replacing the sensor rarely fixes it; finding the chafed or loose section of harness does.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2456 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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