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U0353 Software Incompatibility With Ion Sense Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Engine controller or ion sense module updated without the matching partner software
Replacement ion sense module with another part number or calibration
Programming of one of the two units interrupted or incomplete

Symptoms

  • Check engine light
  • Misfire or knock codes stored at the same time
  • Code appears right after a module replacement or reflash

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–700
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ion sense module

Related codes

U0673U0901P0300

References: patents.google.com, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.