Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC 33, EGR Control Pressure/BARO Sensor CKT High (Low Vac): Notes
Exhaust Gas Recirculation (EGR) control pressure/BARO sensor monitors amount of vacuum in EGR circuit and sends a signal back to PCM. Signal is compared to EGR duty cycle calculated by PCM.
DTC 33 will set when:
- EGR vent is off.
- Desired EGR is less than 60 kPa from EGR pressure.
- EGR pressure is greater than 101 kPa.
PCM will default to shutting down EGR system.
- This step determines if DTC 33 is result of a hard failure or an intermittent condition.
- This step simulates conditions for a DTC 31. If PCM recognizes change, PCM, EGR control pressure/BARO signal circuit and 5-volt reference circuit are okay.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.