P2BC0Turbocharger/Supercharger Bypass Valve A Driver Current/Temperature Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BC0 sets when the output stage that drives bypass valve A reports too much current or overheating. GM applies it to the electric recirculation valve of the LT5-powered 2019 Corvette ZR1: when the H-bridge raises its flag in 80 out of 100 checks spaced 12.5 ms apart, with relay voltage of 11 V or more and no cranking, a Type A fault with immediate MIL results. Integrated H-bridges protect themselves by regulating current, folding it back as the chip warms and finally shutting off – NXP gives a thermal limit of about 175–200 °C junction temperature for its MC33926. Excess current usually comes from a sticking or jammed valve, a shorted motor winding or a short between the motor leads. P2BBF is the low-supply case of the same driver, P00D7 an overheated valve itself. The valve stops responding and boost is reduced.
- What you may notice
- Check engine light on immediately
- Reduced boost and less power
- Compressor surge noise when lifting off
- Likely causes
- LikelySticking or jammed valve making the motor draw high current
- PossibleShorted winding in the valve actuator motor
- PossibleMotor leads shorted to each other or to ground in the harness
- RareOverheated or damaged H-bridge driver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.