P2892 code meaning
Cylinder 1 Ion Current Sense Circuit Low
Powertrain system Generic code P28xx codes Check engine light
What P2892 means
P2892 says the ion measurement of cylinder 1 delivers a signal that stays below the expected range. Electrically this points to a signal line shorted to ground or a measuring stage that no longer builds up its bias voltage; Saab, for example, applies around 120 V across the plug gap between sparks to obtain the current. A heavily fouled plug can also drag the level down by bleeding off the measuring voltage. When the reading is stuck low, the module can no longer judge combustion in cylinder 1 and typically falls back to a safe ignition map. No manufacturer has published this code; on Saab Trionic T8 engines the cylinder 1 ion line runs from coil pin 4 to the processing module. The high-side fault is P2893, the cylinder 2 equivalent P2896.
P2892 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2892
- MIL and stored fault for cylinder 1
- Noticeably less power from retarded ignition
- Possibly unreported misfires on cylinder 1
Common causes of P2892
- Most likelyIon signal wire of cylinder 1 shorted to ground
- PossibleCoil 1 no longer generates its measuring voltage
- PossibleSpark plug of cylinder 1 with leakage path through deposits
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Spark plug cyl 1Ignition coil cyl 1Ion sense module
What each part of P2892 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 92 | The exact fault in that area. |
What to do next
- Note P2892 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2892
What does P2892 mean?
P2892 means "Cylinder 1 Ion Current Sense Circuit Low". P2892 says the ion measurement of cylinder 1 delivers a signal that stays below the expected range. It is a generic code, so it means the same on every make.
Is it safe to drive with P2892?
Drive gently and only to a workshop. With P2892 the car can go into limp mode (reduced power) to protect itself.
Will P2892 fail an emissions test?
Yes, it can. P2892 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2892 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2892 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.