Powertrain, generic (extended)

P2897 Cylinder 2 Ion Current Sense Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2897 applies when the ion current reading of cylinder 2 is stuck above the range the module accepts. Typical electrical reasons are a signal line that has contacted a supply or ignition feed, a damaged coil 2 that leaks primary voltage into its measuring output, or a missing ground at the coil that shifts the reference. Since the processing electronics compare the cylinders, a single high channel is easy to isolate: exchanging coil 2 with another position and watching whether the code follows is a quick test. On Saab's 2009 module the ignition trigger for cylinder 2 arrives on pin 10, which helps when tracing the wiring. No manufacturer documents P2897 publicly. The low case is P2896; cylinder 1 has the matching code P2893.

Likely causes

Ion signal wire of cylinder 2 in contact with a voltage source
Coil 2 leaking primary voltage into the measuring output
Poor ground connection at coil 2

Symptoms

  • MIL and stored cylinder 2 ion fault
  • Less power due to retarded timing on cylinder 2
  • Knock protection for cylinder 2 limited

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–600
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

P2894P2895P2896P2893

References: law.cornell.edu, saabwisonline.com, en.wikipedia.org.