P2897Cylinder 2 Ion Current Sense Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and stored cylinder 2 ion fault
- Less power due to retarded timing on cylinder 2
- Knock protection for cylinder 2 limited
- Likely causes
- LikelyIon signal wire of cylinder 2 in contact with a voltage source
- PossibleCoil 2 leaking primary voltage into the measuring output
- RarePoor ground connection at coil 2
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.