Powertrain, generic (extended)

P2896 Cylinder 2 Ion Current Sense Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2896 reports a cylinder 2 ion signal that remains under its lower limit. A ground short on the line from coil 2, a cracked plug insulator that drains the measuring voltage to the cylinder head, or a coil whose bias generator has failed can all produce a near-zero reading. Where several cylinders share a harness section or connector, a chafed spot can hit cylinder 2 alone if only its conductor is damaged, so the wiring along the cam cover deserves a look. On Saab's 2009 four-cylinder module the cylinder 2 ion input is pin 7, which allows measuring the line directly. No manufacturer publishes this code. Without a usable signal, misfire and knock detection for cylinder 2 lose their basis. P2897 is the high counterpart; cylinder 1 reports the same condition as P2892.

Likely causes

Chafed ion signal wire of cylinder 2 touching ground
Cracked spark plug insulator in cylinder 2
Measuring voltage generator in coil 2 failed

Symptoms

  • MIL with ion fault on cylinder 2
  • Engine runs on a safe ignition map with less power
  • Misfire on cylinder 2 may not be detected

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–500
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

spark plug cyl 2ignition coil cyl 2ion sense module

Related codes

P2894P2895P2897P2892

References: law.cornell.edu, saabwisonline.com, saabwisonline.com.