B2960 on Chevrolet

Passlock / theft-deterrent security sensor fault (GM)

Severity: Inspect soon

GM's bulletins tie B2960 to a security lamp, no-crank or no-start, and in some trucks and vans an engine stall.

It gets more serious if:

This page covers only what differs on Chevrolet. For what B2960 means, the ranked causes and the test order, see the B2960 guide.

1999–2001 · Silverado
Supported by vehicle data
GM's bulletin covers the security lamp, stall and no start with B2960. Whether it is still current is not verified.
2000–2005 · Impala
Supported by vehicle data
GM's bulletin covers B2958/B2960 with a no-crank; owners quote the fix as repairing BCM terminal connections. Whether it is still current is not verified.

01-08-56-002AStatus unverified
Security lamp, engine stall, no start, B2960
1999–2001silverado, tahoe, suburban · issued June 1, 2001 · NHTSA 623100
Some trucks may show the security lamp, stall and not start with B2960. Also covers GMC Sierra and Yukon.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
01-08-56-006Status unverified
Security lamp, engine stalls, no start, B2960
1998–2001g-van · issued October 1, 2001 · NHTSA 627816
Full-size G vans with the security lamp, stall and no start with B2960.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
04-08-47-003Status unverified
Security light on, engine will not crank, B2958 and/or B2960
2000–2005impala, monte-carlo · issued September 1, 2004 · NHTSA 10011075
Security light and no crank with B2958 and/or B2960.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

GM 01-08-56-002A: security lamp on, engine stall, no start, DTC B2960 — General Motors , June 1, 2001
GM 04-08-47-003: security light on, engine will not crank, DTCs B2958 and/or B2960 — General Motors , September 1, 2004
NHTSA complaint ODI 10503695 (2003 Chevrolet Impala) — NHTSA Office of Defects Investigation
Saturn 04-08-45-005: no crank, no start in cold weather, DTCs B2960 and/or B3033 — General Motors (Saturn) , March 1, 2006

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