Code
B2118
HUMMER
B — Body
Front Vertical Sensor Failed
Views:
UK: 9
EN: 13
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the sensor
- Poor or corroded connector/ground
- Failed front vertical sensor
- Water intrusion or physical damage to the sensor
- Faulty or misconfigured control module or software
- Blown fuse or power supply interruption
Symptoms
- DTC B2118 stored or MIL/warning lamp illuminated
- System-dependent messages (e.g., suspension/ride height or service message)
- Reduced functionality of the subsystem that uses the vertical sensor
- Visible abnormal ride height or uneven stance (if sensor used for suspension)
- Intermittent or permanent fault condition after driving or after exposure to moisture
What to check
- Use a compatible scan tool to read codes, freeze frame, and live data for the front vertical sensor
- Verify whether the code is current (active) or stored/pending
- Visually inspect sensor and connector for damage, corrosion, or water intrusion
- Check fuses and related power/ground circuits
- Backprobe the sensor connector and check reference voltage, signal voltage, and ground
- Wiggle test harness/connectors while observing live data to reproduce fault
Signal parameters
- Reference voltage: typically 5 V (verify with factory data)
- Signal voltage: typically 0–5 V analog or a CAN/serial data message depending on sensor type
- Quiescent reading often near mid-scale (~2.5 V) for position sensors — value should change with vertical movement
- Ground: low-resistance chassis ground; expected
Diagnostic algorithm
- Record freeze frame and live data with a scan tool. Note whether sensor value is present, steady, erratic, or absent.
- Clear the code and perform a short road/test cycle to see if B2118 returns.
- Visually inspect the sensor, mounting, and harness for damage, contamination, or loose connections.
- With ignition on, backprobe the sensor connector and confirm: reference voltage present, good ground, and a signal that responds to movement or operation of the related component.
- Perform continuity and resistance checks between the sensor connector and the control module to rule out harness opens/shorts.
- If the sensor is analog: monitor the signal while moving the suspension or applying force to reproduce travel and confirm voltage change. If digital: monitor CAN/serial messages for proper reporting.
- If harness and power/ground are good but the signal is out of spec or absent, replace the sensor and retest.
- After replacement, clear codes and verify proper operation. If the fault persists, inspect the control module and consider module programming or repair per factory procedure.
Likely causes
- Connector corrosion or bent pins at the sensor
- Damaged harness (chafe, rodent bite, broken wire)
- Failed sensor due to internal electronics or mechanical wear
- Intermittent ground connection causing erratic signal
Fault status
Status
Stored when the body/control module detects an absent, out-of-range, or implausible signal from the front vertical sensor. The fault may be flagged as active (present now) or stored/pending depending on recurrence and self-test results.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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