Powertrain, generic (extended)

P2194 System Too Rich at Higher Load (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2194 means bank 2 has reached the lower limit of its trim in the upper load zone: the ECM is removing as much fuel as permitted, yet that bank still runs rich. Because air mass, fuel pressure and canister purge feed both banks, a rich error caused by them usually brings P2192 along. When P2194 stands alone, look at bank 2 itself: a leaking or over-delivering injector, an injector of the wrong flow class after a repair, or a bank 2 front sensor that reads lean so the controller keeps adding fuel. Comparing the trims of both banks while holding a high load on the road or a dynamometer separates the two cases. No manufacturer publishes P2194 criteria; GM uses P2180 with a factor limit of 0.78 for the corresponding range. The driver mainly sees higher consumption.

Likely causes

Leaking or over-delivering injector on bank 2
Bank 2 front sensor reading lean
Air mass sensor reading high or fuel pressure too high (usually with P2192)

Symptoms

  • Check engine light on
  • Increased fuel consumption
  • Bank 2 long-term trim strongly negative at high load

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–900
Time0.5–4 h

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

Parts involved

fuel pressure regulatormass air flow sensorfuel injector

Related codes

P2192P2193P2180P2190P0175

References: law.cornell.edu, gsi.ext.gm.com.