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.
Code P0106, Map Sensor Range Problem - "S" & "T" Series 4.3L (VIN W): Notes
Manifold Absolute Pressure (MAP) sensor responds to changes in manifold pressure (vacuum). Control module receives this information as a signal voltage that varies from 1-1.5 volts at idle to 4-4.6 volts at full throttle. Scan tool displays manifold pressure in volts. Low pressure (high vacuum) reads a low voltage, while high pressure (low vacuum) reads a high voltage. If MAP sensor fails, control module will substitute a fixed MAP value and use throttle position sensor to control fuel delivery.
- Checks MAP sensor output voltage to control module. This voltage represents a barometric reading to control module.
- Applying 10 inches of vacuum to sensor should cause voltage to change. The value obtained by subtracting second reading from first reading should be greater than 1.5 volts. Change should be instantaneous.
- Remove sensor from bracket and gently twist sensor to check for intermittents. Voltage changes of greater than 0.1 volt indicate a bad connector or connection.
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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.