Code
B2145
HUMMER
B — Body
Left Front Mirror Vertical Position Sensor Circuit High
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the left front mirror vertical position sensor circuit
- Short to battery voltage (power feed) on the sensor signal
- Poor connector contact or corrosion at the mirror connector or module
- Failed vertical position sensor (potentiometer/encoder) inside the mirror assembly
- Faulty mirror control module or body control module (less common)
- Water intrusion or physical damage to mirror housing or harness
Symptoms
- Left front mirror will not move vertically or moves erratically
- Mirror position not remembered by memory functions or incorrect memory position
- Possible diagnostic trouble code present without other drivability symptoms
- Intermittent mirror operation or loss of one axis (vertical) control
- Moisture visible in mirror housing or damaged mirror housing
What to check
- Confirm DTC B2145 stored and note freeze-frame/live data values
- Inspect mirror housing and harness for water damage, corrosion, or physical damage
- Visually inspect and reseat/check connector pins at left front mirror
- Check for related DTCs on other mirrors or body modules
- Backprobe harness and check reference voltage, sensor signal, and ground with ignition ON
- Wiggle harness and connector while monitoring live data for intermittent faults
Signal parameters
- Reference (excitation) voltage typically ~5 V (verify with service manual)
- Expected sensor output typically varies within ~0.5–4.5 V as mirror moves (manufacturer-specific)
- ‘High’ condition: sensor signal above normal top threshold (e.g., >4.5–4.8 V) or stuck near battery voltage
- Ground continuity: low resistance to vehicle ground (< a few ohms) at sensor ground circuit (vehicle-specific)
Diagnostic algorithm
- Connect a scan tool, confirm B2145 is present, and view live data for left front mirror vertical position while commanding mirror movement.
- Perform a visual inspection of the left front mirror, harness, and connector for damage, corrosion, or moisture. Repair any visible damage.
- With ignition ON (accessory) backprobe the mirror connector: verify reference/excitation voltage at the sensor connector (≈5 V) and check sensor signal voltage. If signal is high with mirror disconnected, suspect wiring short to battery or module output high.
- With mirror connected, command mirror up/down while observing sensor output. If output does not change or stays at high voltage, suspect internal sensor failure or short to voltage.
- Wiggle the harness and connector while monitoring signal for intermittent changes. Repair any intermittent wiring faults.
- Check continuity of the signal and ground circuits between the mirror connector and the mirror control module/BCM. Repair any opens or shorts.
- If wiring and connectors check good and signal remains high, replace the left front mirror assembly (or vertical position sensor if serviceable).
- If replacing mirror does not clear the fault, test/replace the mirror control module or inspect BCM as directed by manufacturer procedures.
- After repairs, clear DTCs and verify correct mirror operation and that B2145 does not return.
Likely causes
- Corroded/loose connector at left front mirror
- Open or broken signal/ground wire in harness (chafe or pinched)
- Internal sensor fault in mirror assembly (stuck high output)
- Short to constant battery voltage on the sensor signal
- Failed mirror control circuitry or BCM (after wiring and sensor ruled out)
Fault status
Status
B2145 — Left Front Mirror Vertical Position Sensor Circuit High: The vertical position sensor signal for the left front exterior mirror is above the expected voltage range (possible short to battery, open, or internal sensor failure).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
B2145
Other
B — Body
NVM RF HR Failure
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the left front mirror vertical position sensor circuit
- Short to battery voltage (power feed) on the sensor signal
- Poor connector contact or corrosion at the mirror connector or module
- Failed vertical position sensor (potentiometer/encoder) inside the mirror assembly
- Faulty mirror control module or body control module (less common)
- Water intrusion or physical damage to mirror housing or harness
Symptoms
- Left front mirror will not move vertically or moves erratically
- Mirror position not remembered by memory functions or incorrect memory position
- Possible diagnostic trouble code present without other drivability symptoms
- Intermittent mirror operation or loss of one axis (vertical) control
- Moisture visible in mirror housing or damaged mirror housing
What to check
- Confirm DTC B2145 stored and note freeze-frame/live data values
- Inspect mirror housing and harness for water damage, corrosion, or physical damage
- Visually inspect and reseat/check connector pins at left front mirror
- Check for related DTCs on other mirrors or body modules
- Backprobe harness and check reference voltage, sensor signal, and ground with ignition ON
- Wiggle harness and connector while monitoring live data for intermittent faults
Signal parameters
- Reference (excitation) voltage typically ~5 V (verify with service manual)
- Expected sensor output typically varies within ~0.5–4.5 V as mirror moves (manufacturer-specific)
- ‘High’ condition: sensor signal above normal top threshold (e.g., >4.5–4.8 V) or stuck near battery voltage
- Ground continuity: low resistance to vehicle ground (< a few ohms) at sensor ground circuit (vehicle-specific)
Diagnostic algorithm
- Connect a scan tool, confirm B2145 is present, and view live data for left front mirror vertical position while commanding mirror movement.
- Perform a visual inspection of the left front mirror, harness, and connector for damage, corrosion, or moisture. Repair any visible damage.
- With ignition ON (accessory) backprobe the mirror connector: verify reference/excitation voltage at the sensor connector (≈5 V) and check sensor signal voltage. If signal is high with mirror disconnected, suspect wiring short to battery or module output high.
- With mirror connected, command mirror up/down while observing sensor output. If output does not change or stays at high voltage, suspect internal sensor failure or short to voltage.
- Wiggle the harness and connector while monitoring signal for intermittent changes. Repair any intermittent wiring faults.
- Check continuity of the signal and ground circuits between the mirror connector and the mirror control module/BCM. Repair any opens or shorts.
- If wiring and connectors check good and signal remains high, replace the left front mirror assembly (or vertical position sensor if serviceable).
- If replacing mirror does not clear the fault, test/replace the mirror control module or inspect BCM as directed by manufacturer procedures.
- After repairs, clear DTCs and verify correct mirror operation and that B2145 does not return.
Likely causes
- Corroded/loose connector at left front mirror
- Open or broken signal/ground wire in harness (chafe or pinched)
- Internal sensor fault in mirror assembly (stuck high output)
- Short to constant battery voltage on the sensor signal
- Failed mirror control circuitry or BCM (after wiring and sensor ruled out)
Fault status
Status
B2145 — Left Front Mirror Vertical Position Sensor Circuit High: The vertical position sensor signal for the left front exterior mirror is above the expected voltage range (possible short to battery, open, or internal sensor failure).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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