P2893Cylinder 1 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
- With P2893 the ion signal from cylinder 1 sits above its plausible ceiling. A signal line touching a supply voltage is the most direct explanation; crosstalk from the ignition primary circuit or a defective evaluation stage that saturates can show the same picture. Because knock is recognised from fast oscillations superimposed on the ion current, a signal pinned high leaves no room for that information, and the module will usually retard timing on cylinder 1 for safety. Saab's ion detection module, for instance, receives the cylinder 1 trigger on pin 9 and the matching ion input on pin 16, both of which can be checked for foreign voltage. A public manufacturer description of P2893 does not exist. Compare P2892 for the low reading and P2897 for cylinder 2.
- What you may notice
- MIL with cylinder 1 ion fault
- Reduced power and possibly higher fuel consumption
- Knock may go unnoticed on cylinder 1
- Likely causes
- LikelyIon signal wire of cylinder 1 shorted to a voltage source
- PossibleInternal fault in coil 1 coupling ignition voltage into the signal
- RareSaturated input in the ion processing module
- 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.