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Diagnostic Aids

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

DTC P1811 can be caused by a faulty turbocharger or wastegate assembly. If no other symptoms are present, check the turbocharger system for proper operation.

Ask the customer about overloading the vehicle, exceeding the trailer towing limit, or towing in Overdrive.

If, after several unsuccessful attempts to gain accurate shift times, and an adapt can be made, reset adapts and operate the vehicle to assure proper shifting.

While driving the vehicle, inspect for loss of power, misfire, or other engine-related driving conditions.

DTC P1811 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.

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