Powertrain, generic (extended)

P2C2F Turbocharger/Supercharger Bypass Valve B Driver Current/Temperature Too High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C2F is stored when the output stage driving compressor bypass valve B signals excessive current or overheating. The motor driver protects itself by limiting current and finally switching off, and reports this to the engine module. No manufacturer documents P2C2F; GM documents the A-side code P2BC0 for the supercharged 2019 LT5: a raised driver flag in 80 of 100 checks at 12.5 ms, with relay voltage of 11 V or more and no cranking, gives a Type A fault. NXP's MC33926 bridge, a typical part for such loads, regulates overcurrent and shuts down on overtemperature. Excess current mostly stems from a jammed valve working against its stop, a shorted motor winding or touching motor leads. Valve B overheating itself is P00D8; low supply to the same driver is P2C2E.

Likely causes

Jammed valve forcing the motor to stall against its stop
Shorted winding in the valve actuator motor
Motor leads shorted to each other or to ground
Overheated or faulty driver inside the engine module

Symptoms

  • Check engine light
  • Valve stops responding, boost reduced

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–1,200
Time0.5–3 h

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

Parts involved

turbo bypass valve bwiring harnessecm

Related codes

P2BC0P2C2EP00D8P2C29P00C4

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