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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 623 (Transfer Case - NVG 246-NP8 (2-Speed Automatic)) >> Diagnostic Information & Procedures >> DTC C0376: Greater Than 20% Difference In The Speed Sensor Inputs >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Front and Rear Propshaft Speed Sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The module converts the pulsating AC voltage to a propshaft RPM which is used for calculations. The module only looks at these inputs together when the vehicle is in 4H, 4L, and AUTO 4WD range only. The propshaft RPM can be displayed with a scan tool.

This DTC detects greater than 20% difference in the speed sensor inputs.

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