P022D
Charge Air Cooler Bypass Control B Circuit /Open
Turbo / boost control
Generic OBD-II
Low
What it means
P022D sets when the module detects an open in the control circuit for the "B" charge air cooler (intercooler) bypass actuator. That bypass routes intake air around the intercooler to manage air temperature, so a fault mainly affects boost efficiency rather than whether the car runs. It is an electrical circuit fault — check the actuator and its wiring, not the engine internals.
Low
Can I keep driving? Generally safe to drive — this is an intercooler bypass actuator circuit, so you may notice slightly reduced boost efficiency but no immediate risk.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable driving symptoms
- Possible slightly reduced performance under boost
- Higher intake air temperatures in some conditions
Common causes
Most likely first
- Open circuit in the charge air cooler bypass 'B' control wiringLikely
- Failed bypass control solenoid or actuatorCommon
- Corroded or disconnected actuator connectorCommon
- Damaged control-side ground or supply wireLess often
- Faulty control module (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and locate the charge air cooler bypass 'B' actuator.
- Inspect its connector and wiring for an open, break, or corrosion.
- Measure the actuator/solenoid resistance and compare to spec — an open coil confirms a failed unit.
- Check the control circuit for continuity back to the module.
- Replace the bypass actuator or repair the wiring, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P022D?+
Yes, in most cases. The intercooler bypass mainly affects intake-air temperature management, so short-term driving is low-risk, but get it checked to keep boost performance right.
Can I just clear P022D?+
It will come back on the next drive if the circuit is still open. The wiring or actuator needs repair first.
Related codes
Often seen with P022D
Read & clear P022D 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