P024B
Charge Air Cooler Bypass Control A Stuck
Turbo / charge air
Generic OBD-II
Low
What it means
P024B means the charge-air-cooler (intercooler) bypass valve isn't responding to the ECM's commands — the "A" control appears stuck. This valve routes intake air around or through the cooler to manage charge temperature on turbo and supercharged engines. Stuck, it can leave intake temperatures and boost efficiency off-target, showing up as mild power or economy loss rather than a no-start.
Low
Can I keep driving? Generally drivable — expect some loss of performance or efficiency, but it doesn't cause a no-start. Get it looked at to protect intake temperatures.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or sluggish acceleration
- Higher-than-normal intake air temperatures
- Slightly reduced fuel economy
Common causes
Most likely first
- Charge-air-cooler bypass valve/actuator seized or stuck (carbon or debris)Likely
- Binding linkage or mechanical obstruction at the bypass valveCommon
- Loose or corroded connector at the bypass control actuatorCommon
- Damaged wiring in the bypass control circuitLess often
- Faulty bypass control actuator or ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the actuator is commanded but not moving.
- Inspect the bypass valve and linkage for carbon buildup, debris, or binding; free or clean it.
- Check the actuator connector and wiring for looseness, corrosion, or damage.
- Command the actuator with a scan tool and watch for movement.
- Replace the bypass actuator if it won't move with good wiring and a free valve.
FAQ
Quick answers
Is it safe to drive with P024B?+
Yes, short-term — it mainly affects charge-air cooling and performance, not starting. Fix it to keep intake temperatures and efficiency in check.
Can I just clear P024B?+
It will return while the bypass valve is stuck. The mechanical or wiring fault has to be corrected for the code to stay off.
Related codes
Often seen with P024B
Read & clear P024B 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