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DTC codes / P02xx · Fuel and air metering (injector circuits) / P022C

P022CCharge Air Cooler Bypass Control A Circuit High

P022C indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the charge air cooler (CAC) bypass valve, often referred to as the intercooler bypass actuator. This high voltage condition typically means the circuit is open, shorted to power, or the actuator itself has failed, preventing the PCM from properly commanding the bypass valve to open or close.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illumination of the check engine light (malfunction indicator lamp) with no other noticeable symptoms
  • Reduced engine performance or power, especially during acceleration
  • Poor fuel economy or increased turbo lag
  • Rough idle or hesitation under light throttle
  • In rare cases, the engine may enter limp mode to protect the turbocharger and intake system

Common causes, most likely first

  1. Open or damaged wire in the bypass control circuit (e.g., broken conductor, corroded connector)
  2. Short to voltage on the control circuit, often due to chafed insulation or moisture intrusion
  3. Failed charge air cooler bypass actuator (stuck, seized, or electrically faulty)
  4. Poor electrical connection at the actuator or PCM connector (loose pins, corrosion)
  5. Faulty powertrain control module (PCM) driver circuit, though this is less common
  6. Aftermarket or modified wiring that bypasses or alters the original circuit

How to diagnose and fix it

  1. Perform a visual inspection of the bypass actuator, its connector, and the wiring harness for obvious damage, corrosion, or loose connections
  2. Use a scan tool to command the bypass actuator on and off while monitoring the control circuit voltage to confirm the fault
  3. Disconnect the actuator and measure resistance across its control terminals; compare to manufacturer specifications to rule out a failed actuator
  4. Check for continuity and short to voltage on the control wire between the PCM and actuator, repairing any opens or shorts as needed
  5. Inspect and clean the PCM connector pins, and verify that the PCM is properly grounded
  6. If the circuit and actuator test good, substitute a known-good actuator to see if the code clears
  7. As a last resort, diagnose the PCM driver circuit or replace the PCM if all other components are verified good

Bypass circuit checks that prevent misdiagnosis

  • A high voltage code on the bypass control circuit often results from a simple open circuit, such as a broken wire near the actuator connector, rather than a failed actuator itself.
  • The charge air cooler bypass valve is used to improve throttle response and reduce turbo lag; a fault here may not always trigger noticeable performance issues, leading some drivers to ignore the warning light.
  • Technicians sometimes replace the bypass actuator prematurely when the real problem is a corroded connector or chafed wire hidden under the loom, so always perform a thorough circuit test first.
  • On some vehicles, the bypass actuator shares a ground with other sensors; a bad ground can cause a high voltage code on the control circuit even though the actuator is fine.
  • This code can be set intermittently by water intrusion into the connector after driving through deep puddles or in heavy rain, so check for signs of moisture.

Can I keep driving with P022C?

You can generally continue driving with this code, but avoid heavy acceleration or towing until it is repaired, as the bypass valve may not function correctly and could reduce engine performance or, in rare cases, lead to turbocharger damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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