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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 203 (CRUISE CONTROL SYSTEM)DIAGNOSTIC TESTSDTC P1566: POWERTRAIN CONTROL MODULE DETECTS HIGH ENGINE SPEEDTESTING
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

DTC P1566: Powertrain Control Module Detects High Engine Speed: Testing

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Testing
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform The CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK . Once test has been performed, go to next step.
  2. Since most occurrences of DTC P1566 are caused when the engine speed exceeds the maximum allowed RPM, verify the conditions under which the DTC was set with the customer. If an engine RPM condition caused this DTC to set, go to next step. If not, see Diagnostic Aids .
  3. Explain system operation to the customer and clear this DTC.
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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.