What does B3055 mean on a Chevy?

B3055. No Transponder Modulation. Applies to Silverado, Sierra, Tahoe, Impala, Equinox.

What causes B3055 on a Chevy?

Unprogrammed or damaged transponder key Failed exciter coil around the ignition lock cylinder Body control module (BCM) transponder fault RF interference from other transponder keys on the same ring Low battery voltage during key programming

How do I fix B3055 on a Chevy?

Try a known-good programmed key first Remove other transponder keys and RFID devices from the key ring Test the exciter coil signal with a scan tool during crank Program keys following GM service information exactly Replace the exciter coil before condemning the BCM

Code

B3055

No Transponder Modulation

Category: Body
Severity: Body Warning Light
Applies to: Silverado, Sierra, Tahoe, Impala, Equinox
Related: No single generic twin. See OBD Codes List

What it means

B3055. No Transponder Modulation. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Impala, Equinox.

Findings, check these first

Unprogrammed or damaged transponder key
Failed exciter coil around the ignition lock cylinder
Body control module (BCM) transponder fault
RF interference from other transponder keys on the same ring
Low battery voltage during key programming

Standard procedure

Try a known-good programmed key first
Remove other transponder keys and RFID devices from the key ring
Test the exciter coil signal with a scan tool during crank
Program keys following GM service information exactly
Replace the exciter coil before condemning the BCM

Look up another code

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Sources and review

Review: no source links are recorded for this entry.

Last updated 2026-09-25.

Report a correction for B3055. Include your vehicle, the issue and a source if you have one.

This fault sits in the GM theft deterrent system. The GM security codes and Passlock relearn guide covers the families and the relearn cycles.