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.
Circuit/System Verification
2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
- If DTC P0641 or P0651 are set, refer to DTC P0641 or P0651 .
- Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
- Verify that the engine is in good mechanical condition. Refer to Symptoms - Engine Mechanical for the 4.8L, 5.3L, 6.0L and 6.2L engine.
- Ignition OFF for 90 seconds, determine the current vehicle testing altitude. Ignition ON, observe the scan tool BARO Sensor parameter. Compare the parameter to the Altitude Versus Barometric Pressure table. The BARO sensor pressure parameter should be within the specified range indicated in the table.
- A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle under various operating conditions. The readings should be within 3 kPa of the known good vehicle.
- Ignition ON, observe the scan tool MAP sensor parameter. Start the engine. The MAP Sensor parameter should change.
- If the vehicle passes the Circuit System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records list.
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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.