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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC U1301: CLASS 2 DATA LINK SHORTED TO POWERDIAGNOSTIC AIDS
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Diagnostic Aids

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

DTC U1301 indicates a short to ground or power in class 2 serial data line to a particular module. DTC U1301 will only be read as a history DTC. Check for intermittent connections and circuits by wiggling wires and connectors to suspect modules. See TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS to isolate intermittent condition.

RENDER: 1.0x

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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.