P2CE8

Code

Generic P — Powertrain

Particulate Filter Pressure Sensor C Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 90 RU: 23

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Page language: EN

Causes

Short to battery on the sensor signal circuit
Open or high-resistance ground or reference circuit
Failed or internally damaged particulate filter pressure sensor
Blocked or restricted differential pressure tubing or ports (causing excessive actual pressure)
Corroded/damaged connector or wiring harness
ECM/PCM input fault (less common)

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Diagnostic trouble code P2CE8 stored
Reduced engine power or limp mode on some vehicles
Frequent or failed DPF regenerations, possible regen requests
Elevated exhaust backpressure, increased fuel use or visible smoke

What to check

Scan for stored codes and freeze frame / live data for differential pressure and related parameters
Visual inspection of sensor, connector, wiring harness and vacuum/pressure hoses for damage or contamination
Backprobe sensor signal, reference (5V) and ground with ignition ON to verify proper voltages
Check signal voltage while blocking or venting the sensor port (if serviceable) to observe expected change
Measure continuity and resistance to ground and power for the sensor circuits
Perform wiggle test on wiring while monitoring live data for intermittent faults

Signal parameters

Reference supply typically 5 V (verify exact vehicle spec)
Expected sensor output typically ~0.5 V at near-zero differential pressure and increases with pressure (commonly 0.5–4.5 V across operating range)
A steady signal above nominal maximum (close to supply voltage) indicates a short to battery or sensor internal fault
Open or near-zero voltage indicates open circuit or short to ground
Compare live voltage readings to manufacturer-specific charts if available

Diagnostic algorithm

Read freeze frame and live data. Note differential pressure sensor voltage and actual pressure readings at key conditions (idle, higher rpm, before/after regen).
Perform a visual inspection of sensor, connector and pressure hoses. Repair or replace any damaged hoses or connectors.
With ignition ON (engine OFF), backprobe the sensor: verify reference (typically 5 V), signal, and ground. If reference or ground missing, trace and repair wiring/ECU connector.
If reference and ground are OK but signal is high (near battery voltage), disconnect the sensor connector and measure voltage on the harness signal pin. If voltage remains high with sensor disconnected, suspect wiring short to battery or ECM output problem.
If harness signal is normal with sensor disconnected, bench-test or substitute a known-good sensor and re-check. Replace sensor if substitute clears the high signal.
Check continuity between signal wire and battery positive for shorts, and between ground and chassis for poor returns. Repair wiring as required (repair splice, replace harness section).
If wiring and sensor check OK, inspect DPF for excessive restriction. Perform DPF diagnostics (soot load measurement, pressure differential at known flows). Clean or replace DPF if necessary.
After repairs, clear codes and perform a road test including a regeneration cycle if applicable. Re-scan to confirm the fault does not return.
If code persists after sensor and wiring repairs, consider ECM input fault and refer to manufacturer procedures for module testing/replacement.

Likely causes

Signal wire shorted to battery voltage (pin damage, chafing)
Corroded connector pins or poor sensor ground
Contaminated or clogged pressure line (debris, soot, water)
Failed sensor electronics (internal short or drift)
Excessive DPF backpressure due to heavy soot loading or restriction

Fault status

⚠️ Status

P2CE8 — Particulate Filter Pressure Sensor C Circuit High: controller detects sensor signal higher than expected; possible short to battery, sensor failure, wiring fault, or excessive differential pressure.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-2 hours