Powertrain, generic (extended)

P226C Turbocharger Boost Control A Slow Response

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P226C means the boost control actuator of turbocharger A does move, but too slowly, so boost lags behind changes in demand. Ford's 2023 diesel summary runs an intrusive check on the 3.0 L and 1.5 L at idle, once in each drive cycle: the variable vanes travel from closed to open, and within 7 s manifold pressure must change by at least 6.5 kPa at sea level (3.5 kPa at 8,000 ft). Mitsubishi's 2022 Eclipse Cross 1.5 turbo sets it when the wastegate angle stays more than 20 % off target for 5 s and then limits torque. FCA changed P226C on the 2014 Ram 6.7 L Cummins so that the MIL needs two trips instead of one; FCA case S2018000009 (Jeep) blames varnish in the VGT housing, Nissan NTB20-071 (Titan XD 5.0 diesel) a binding turbine control valve. P226F is the B side.

Likely causes

Variable vanes or turbine control valve sluggish from soot, varnish or corrosion
Worn electric or pneumatic boost actuator, or a weak control solenoid
Damaged wiring or connector between actuator and control module
Control module software that needs an update (cold-weather false sets)

Symptoms

  • Hesitant pull from low engine speed, turbo lag
  • MIL on, sometimes with a torque limit
  • More smoke on acceleration with diesel engines

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
Time0.5–6 h

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

Parts involved

turbochargerboost control solenoid

Related codes

P226FP00AFP2563P0299P2263P0045

References: fordservicecontent.com, mitsubishitechinfo.com, static.nhtsa.gov, static.nhtsa.gov.