What does U1301 mean on a Chevy?

U1301. Class 2 Short to Battery. Applies to Silverado, Sierra, Tahoe, Yukon, Suburban.

What causes U1301 on a Chevy?

Class 2 data wire shorted to a battery feed Pinched harness where power and data lines run together Failed module back-feeding voltage onto the bus Damaged trailer or aftermarket wiring crossed into the data line Corroded connector bridging power to the data pin

How do I fix U1301 on a Chevy?

Measure bus voltage; high voltage confirms a short to battery Disconnect modules one at a time until voltage normalizes Inspect harness sections shared with battery feeds Remove aftermarket and trailer wiring taps Repair the short before replacing any module

Code

U1301

Class 2 Short to Battery

Category: Network Communications
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Yukon, Suburban
Related: No single generic twin. See OBD Codes List

What it means

U1301. Class 2 Short to Battery. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban.

Findings, check these first

Class 2 data wire shorted to a battery feed
Pinched harness where power and data lines run together
Failed module back-feeding voltage onto the bus
Damaged trailer or aftermarket wiring crossed into the data line
Corroded connector bridging power to the data pin

Standard procedure

Measure bus voltage; high voltage confirms a short to battery
Disconnect modules one at a time until voltage normalizes
Inspect harness sections shared with battery feeds
Remove aftermarket and trailer wiring taps
Repair the short before replacing any module

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: no source links are recorded for this entry.

Last updated 2026-09-13.

Report a correction for U1301. Include your vehicle, the issue and a source if you have one.