QSM11 Fault Code
Free · no signupCode 221 / 222
Black Smoke/Low Power.
System
Baro/Boost
Symptom
Black Smoke/Low Power.
Diagnosis & fix steps
LOGIC: Turbo boost pressure sensor mismatch.
ACTION: Inspect the MAP sensor on the intake manifold; check for "Boost Leaks" in the charge air cooler.
Red Seal field insights
On the QSM11, the hose from the intake to the sensor often gets brittle and cracks. You’ll have a "Sensor Code" when it's actually just a $5 piece of rubber hose.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
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