P2C2F

Code

Generic P — Powertrain

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

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 28 RU: 17

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Page language: EN

Causes

Short to battery (power) on bypass valve coil circuit
Short to ground on bypass valve coil circuit
Bypass/recirculation valve coil partially shorted or internally damaged
Stuck or mechanically binding bypass valve causing high current
Oil contamination or debris in valve increasing load
High resistance in connector or harness causing heat build-up

Symptoms

Malfunction Indicator Lamp (MIL)/Check Engine Light illuminated
Reduced engine power or turbo boost (limp or reduced performance)
Intermittent or constant turbo boost control fault
Hissing or unusual noise from bypass/recirculation valve
Stored additional boost or turbo-related DTCs
Possible fuel economy degradation

What to check

Read freeze frame and pending/related codes with scan tool
Inspect wiring and connectors at bypass valve for damage, corrosion, oil
Visually inspect valve and linkage for mechanical binding or contamination
Measure coil resistance of bypass valve (compare to spec/service data)
Backprobe valve connector and monitor commanded voltage (duty cycle) and actual voltage
Measure circuit current while commanding valve (use in-line current meter or clamp meter)

Signal parameters

Coil resistance (ohms) — compare to manufacturer spec
Driver output voltage to valve (V) when commanded
Command duty cycle (%) from PCM (if PWM controlled)
Measured current draw (A) during valve operation — typically < specified max
PCM driver temperature or internal over-temperature flag (if available)
Battery voltage (V) at time of event

Diagnostic algorithm

Retrieve and record freeze-frame data and all related codes. Clear the code and attempt to reproduce to confirm persistence.
Perform a careful visual inspection of the bypass valve, harness, and connectors for chafing, pin corrosion, oil contamination or heat damage. Repair any obvious damage.
With connector disconnected, measure valve coil resistance. Compare to spec. A very low resistance indicates a shorted coil; open circuit indicates broken coil.
Backprobe the valve connector and command the valve with a scan tool while monitoring voltage and current. Use a clamp or inline ammeter to measure current draw under commanded operation and compare to spec.
If current is higher than expected, inspect for mechanical binding: remove/inspect valve and actuating mechanism for seizure, buildup, or mechanical interference.
Check for shorts to battery or ground in the circuit: with key off, measure resistance from valve positive circuit to battery positive, and valve negative circuit to ground. Repair shorted wiring.
Wiggle test wiring while monitoring current/voltage to find intermittent shorts or breaks. Repair or replace damaged harness sections and connectors.
If wiring and valve check good, suspect PCM driver failure. Confirm by substituting a known-good bypass valve or using a bench test harness. If PCM driver is confirmed faulty, follow manufacturer procedures for module replacement or repair.
After repairs, clear codes and road-test to confirm the fault does not return. Re-scan for related codes and verify boost control operation.

Likely causes

Damaged wiring or chafed harness at or near turbocharger
Corroded/loose connector at bypass valve
Failed bypass valve coil (low resistance/short)
Mechanical seizure of valve linkage or actuator
PCM driver partially shorted from prior load/heat damage

Fault status

⚠️ Status

Turbocharger/Supercharger B bypass valve driver current or driver temperature exceeded allowed limits. PCM detected excessive driver current/over-temperature on bypass valve B circuit and set code P2C2F.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours