Code
B2961
HUMMER
B — Body
Key In Ignition Circuit Malfunction
Views:
UK: 12
EN: 27
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between ignition/key‑in‑ignition switch and BCM/IPC
- Corroded, loose or damaged connector at the ignition switch or body control module
- Faulty key‑in‑ignition switch or sensor assembly
- Faulty body control module / instrument panel cluster or internal input fault
- Blown fuse or poor ground related to the circuit
- Aftermarket alarm, remote starter or wiring modification interfering with the circuit
Symptoms
- Key‑in‑ignition lamp/chime stays on or does not respond correctly
- Interior chime/door chime anomalies or constant chime
- Remote start, passive entry or anti‑theft features disabled or erratic
- Unexpected battery drain with vehicle off
- Vehicle shows related body/communication faults or erratic instrument cluster behavior
- Code B2961 stored; may be accompanied by communication or security codes
What to check
- Use a scan tool to read B2961 and any other stored codes and freeze frame data
- Verify current key position and observe key‑in‑ignition status data parameter while operating the key
- Visually inspect ignition switch connector and BCM/IPC connector for corrosion, bent pins or damage
- Check relevant fuses and power/ground circuits for the body control module and ignition switch
- Inspect for aftermarket alarm/remote start wiring and disconnect to test
- Wiggle test wiring harness while monitoring key‑in status for intermittent changes
Signal parameters
- Expected digital/switch behavior: signal should change state when key is inserted/removed (open/closed). Typical expected levels: Key out = ~0 V (0–0.5 V) or logic low; Key in = logic high ≈ 5 V (4.5–5.5 V) OR battery voltage if circuit is tied to B+ (≈ 9–16 V depending on system). Refer to vehicle wiring diagram for exact pin voltages and pull‑up type.
- At BCM/IPC connector: continuity to ignition switch pin with key inserted/removed; resistance should be near 0 Ω when closed, open/infinite when open.
- No short to battery or chassis ground when circuit expected open.
Diagnostic algorithm
- Retrieve DTCs and freeze frame with a capable scan tool; note any related security or communication codes.
- Confirm current sensor state: with ignition off, observe scan tool parameter for key‑in status; insert and remove key while watching the parameter and chime behavior.
- Visually inspect ignition switch/lock cylinder area and connectors for damage, corrosion, insect nests or debris. Inspect harness for pinch points or rodent damage.
- Check fuses and perform a ground check at module and ignition switch ground points. Repair any poor grounds.
- Backprobe the ignition/key‑in switch connector. Measure voltage to ground with key in and key out. Compare to expected values from wiring diagram.
- If expected voltage not present, disconnect connector at the BCM/IPC and check for continuity between the ignition switch and module pins; repair any opens or high resistance.
- Check for shorts to battery: with circuit open, measure for B+ on the signal wire; repair short if present.
- If wiring and connectors are good, swap or bench‑test the ignition lock switch assembly (if serviceable) or replace the ignition switch per manufacturer procedures.
- If circuit and switch test good, investigate BCM/IPC input pin for internal fault; check for related U‑codes (communication faults). If BCM suspected, perform manufacturer‑recommended module tests and programming before replacement.
- Clear codes, perform full system test and road test; monitor for return of B2961 and related symptoms.
Likely causes
- Damaged connector or wiring insulation at ignition switch (most common)
- Failed key‑in‑ignition microswitch inside the ignition lock cylinder
- Corroded or pushed‑out terminal at the BCM/IPC connector
- Aftermarket device tapping the circuit (remote start or alarm) causing contention
Fault status
Status
Key In Ignition Circuit Malfunction — signal missing, stuck or out of range; may affect chimes, security and remote start features.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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