P2895

Code

Generic P — Powertrain

Cylinder 2 Ion Current Sense Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 30 RU: 17

AI status

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Page language: EN

Causes

Open or short in ion current sense wiring or connector (cylinder 2)
Poor or corroded connector or ground at the ignition coil/ion sensor
Faulty ignition coil or coil-on-plug assembly for cylinder 2
Damaged or fouled spark plug or plug wire (if applicable)
Excessive resistance in injector/coil primary circuit or harness
Short to battery or ground in ion sense circuit

Symptoms

Illuminated malfunction indicator lamp (MIL/check engine light)
Intermittent or sustained misfire on cylinder 2
Rough idle, poor drivability, hesitation or reduced power
Possible increased fuel consumption and emissions
Diagnostic trouble codes for misfire (e.g., P0302) or other cylinders
Noise or irregularities in ion current live data when viewed with a scanner/oscilloscope

What to check

Retrieve freeze frame and live data with capable scan tool; note ion current trace and any correlated misfire codes (P0302, P0300)
Compare ion current waveform and amplitude for cylinder 2 versus other cylinders
Inspect coil-on-plug (COP) connector, wiring harness and ground for damage, corrosion, or loose connections
Visually inspect spark plug in cylinder 2 for fouling, damage, or incorrect gap; check torque/installation
Perform continuity and resistance checks of ion sense wiring between coil and ECM connector
Check battery and charging voltages and related power/ground circuits to ECM and ignition system

Signal parameters

Signal type: low-level pulsed ion current synchronized to ignition events
Baseline: near zero between spark events; pulses occur at each combustion event
Amplitude: small pulses — typically in the microamp to low milliamp range (manufacturer-specific). Pulses should be consistent in amplitude across healthy cylinders
Timing: pulse timing aligns with ignition dwell/firing event; waveform shape should be repeatable
Abnormal indications: zero/absent pulses, constant high baseline, excessive noise, inconsistent amplitude, or timing shifts relative to other cylinders

Diagnostic algorithm

Connect a scan tool that can display ion current traces. Confirm P2895 and check for related codes (e.g., misfire P0302). Record freeze frame data and live ion current waveform for cylinder 2 and compare to other cylinders.
Visually inspect cylinder 2 ignition coil/plug area. Look for oil, coolant, carbon tracking, broken boots, corrosion, or physical damage. Repair or clean as needed.
With the engine off, disconnect the coil-on-plug connector for cylinder 2. Inspect terminals for corrosion, bent pins, or water ingress. Reconnect firmly and retest.
Measure continuity and resistance of the ion-sense wiring between the coil connector and the ECM pin. Look for opens, shorts to ground, or short to battery. Repair wiring faults and recheck.
Swap the cylinder 2 coil assembly with an adjacent cylinder coil (if compatible). Clear codes and run the engine. If the code or misfire follows the coil, replace the faulty coil.
Inspect and, if necessary, replace the spark plug in cylinder 2. Verify correct type and gap to factory specification. Reinstall and retest.
While monitoring live data, perform a wiggle test on the harness and connectors to reveal intermittent faults. Repair or reseal connectors that cause signal changes.
If wiring and ignition components check good but signal remains abnormal, inspect ECM connector terminals for damage and test ECM power/grounds. Consider ECM bench test or replacement only after ruling out all harness and ignition components.
After repairs, clear codes and road-test while monitoring ion current and misfire counters to confirm normal signals and that P2895 does not return.
If code persists and all hardware checks good, consult manufacturer service information for ECM software updates or known issues before replacing the ECM.

Likely causes

Frayed or disconnected ion-sense harness to cylinder 2 coil
Corroded coil connector causing intermittent/low signal
Damaged coil secondary or primary winding leading to abnormal ion current
Plug fouling/incorrect gap preventing consistent spark/ionization
Aftermarket ignition component incompatible with ion sensing
Intermittent short when wiring flexes (heat/vibration)

Fault status

⚠️ Status

ECM detected cylinder 2 ion current sense circuit out of range or performing abnormally (open, short, low/no pulse, noisy signal, or inconsistent timing).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours