U0353Software Incompatibility With Ion Sense Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- An ion sense module places a small voltage across the plug gap after each spark and turns the resulting ion current into combustion, knock and misfire information for the engine controller; Ford's patent US20170030322A1 shows such a unit inside the ignition system. U0353 says the engine controller has found software or a calibration in this module that does not match its own, typically after a module swap or a one-sided update. No manufacturer documents U0353 publicly. Stellantis' 3.0 L Hurricane six shows how tightly the parts depend on software: bulletin 18-004-24 cures P2F64 (ion sense feedback circuit A) with PCM software, and 08-205-24 reflashes ignition module and PCM together. CARB demands a calibration ID for each emission-related unit; without accepted ion data misfire detection loses its basis, so a MIL is likely.
- What you may notice
- Check engine light
- Misfire or knock codes stored at the same time
- Code appears right after a module replacement or reflash
- Likely causes
- LikelyEngine controller or ion sense module updated without the matching partner software
- PossibleReplacement ion sense module with another part number or calibration
- RareProgramming of one of the two units interrupted or incomplete
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.