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Home >> GMC >> 2001 >> C3500 HD 8.1 G, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Description & Operation >> Limp-In Mode

Limp-In Mode

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If sensor input signals are missing or inadequate for transmission operation, PCM will output preset operating signals to transmission. This mode will keep vehicle operational and allow it to be driven with reduced transmission function and performance until a repair facility is reached. Malfunction Indicator Light (MIL) may illuminate if malfunction occurs. Vehicle should not be driven for extended periods in limp-in mode.

NOTE: Malfunction Indicator Light (MIL) located on instrument cluster is also referred to as SERVICE ENGINE SOON light.
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