P022B
Charge Air Cooler Bypass Control A Circuit Low
Charge-air cooling (boost)
Generic OBD-II
Low
What it means
P022B means the ECM detected low voltage (a short-to-ground or open) in the control circuit for the charge-air-cooler (intercooler) bypass valve. This valve routes intake air around the cooler to manage charge-air temperature. The fault is electrical rather than mechanical, so the engine usually still runs normally while boost and charge-air cooling may not be optimally controlled.
Low
Can I keep driving? Usually drivable — this is an electrical fault in the intercooler bypass control, with little day-to-day effect, though boost/charge-air performance may suffer.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable driving symptoms
- Possible slight loss of power or throttle response under boost
Common causes
Most likely first
- Short-to-ground or low voltage in the charge-air-cooler bypass control circuitLikely
- Damaged, chafed, or corroded wiring/connector at the bypass actuator or solenoidCommon
- Failed charge-air-cooler bypass control valve or actuatorCommon
- Faulty engine control module (ECM) — least commonLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the bypass actuator/solenoid connector and wiring for shorts or corrosion.
- Measure the control-circuit voltage and check for a short to ground against the wiring diagram.
- Test the bypass actuator/solenoid resistance against spec; replace if faulty.
- If wiring and actuator are good, have the ECM checked. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P022B?+
Generally yes — it rarely affects normal driving. The charge-air-cooler bypass may not operate correctly, so fix it to keep boost and intake-air cooling working as designed.
Can I just clear P022B?+
It will clear, but a low-voltage circuit fault returns until the wiring or actuator is repaired.
Related codes
Often seen with P022B
Read & clear P022B yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX