Code
B2948
HUMMER
B — Body
Security System Sensor Power Circuit High
Views:
UK: 12
EN: 17
RU: 10
AI status
Completed
Completed
100%
Causes
- Short to battery/constant power on the sensor power feed
- Faulty or stuck sensor pulling the circuit high
- Damaged or corroded connector causing incorrect voltage reading
- Aftermarket alarm or accessory wired into the sensor power circuit
- Faulty BCM/security module internal regulator or sensor input
- Blown or incorrect fuse/repair creating abnormal feed
Symptoms
- Security/anti-theft warning lamp illuminated or flashing
- Alarm may trigger unexpectedly or not arm/disarm correctly
- Possible no-start condition if immobilizer behavior is affected
- Intermittent loss of sensor input or false sensor activations
- Possible battery drain if circuit is being held at an abnormal voltage
What to check
- Read DTC with a capable scan tool; record freeze-frame and current data
- Visually inspect wiring and connectors at the BCM and affected sensors for damage, corrosion, or aftermarket splices
- Check for and identify any aftermarket alarm or device connected to the vehicle wiring
- Verify appropriate fuses and fusible links for the security circuit
- Measure battery voltage and note charging system voltage before/while testing
- Back-probe sensor power feed and BCM sensor input to observe voltage with ignition OFF/ON/engine running
Signal parameters
- Sensor power reference typically 5.0 V (nominal) for logic-level sensor circuits; high fault commonly triggered above ~5.5 V
- Some security sensors or feeds are ignition/battery-switched 12 V; expected ~12 V (nominal 12–14.5 V); high fault if substantially above charging system voltage
- Expected sensor input should be stable and within ±0.25 V of the specified reference for 5 V circuits
- Compare measured values to vehicle-specific wiring diagram and manufacturer specifications
Diagnostic algorithm
- Connect a scan tool, retrieve freeze-frame data and live sensor power circuit values. Note when the fault first set and any accompanying codes.
- Visually inspect harnesses, connectors, and grounds for the security sensors and BCM. Look for aftermarket splices or alarm modules.
- With ignition ON (do not start unless specified), back-probe the sensor power feed at the sensor connector and at the BCM input. Record voltages and compare to expected values.
- If voltage is higher than expected, disconnect the suspect sensor(s) or aftermarket device(s). Re-test voltage; if voltage returns to normal, the disconnected component is likely causing the high.
- If disconnecting devices does not change the high voltage, trace the wiring back toward the BCM looking for a short to a constant power source (pinched/chafed wire contacting battery feed). Repair any damaged wiring.
- Check related fuses and fusible links; replace if faulty and re-test. Confirm wiring repairs restore normal voltage range.
- If wiring and external components are verified good but the circuit still reports high, suspect BCM/module internal fault. Verify with a secondary BCM or follow manufacturer procedure before replacing (reprogramming may be required).
- Clear codes and perform function test/road test to confirm repair. Re-scan to ensure code does not return.
Likely causes
- Short to battery or accessory power on the sensor power feed (most common)
- Faulty security sensor or stuck component applying higher voltage to the circuit
- Aftermarket alarm or incorrect installation tied into the circuit
- Corroded/poor connector at sensor or BCM resulting in false high reading
- Internal BCM/module fault (less common, after wiring/items ruled out)
Fault status
Status
Security System Sensor Power Circuit High — over-voltage detected on sensor power/monitor circuit; inspect wiring, connectors, sensors and BCM.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
B2948
MITSUBISHI
B — Body
Down latch RH open:close timeout
Views:
UK: 13
EN: 17
RU: 12
AI status
Completed
Completed
100%
Causes
- Short to battery/constant power on the sensor power feed
- Faulty or stuck sensor pulling the circuit high
- Damaged or corroded connector causing incorrect voltage reading
- Aftermarket alarm or accessory wired into the sensor power circuit
- Faulty BCM/security module internal regulator or sensor input
- Blown or incorrect fuse/repair creating abnormal feed
Symptoms
- Security/anti-theft warning lamp illuminated or flashing
- Alarm may trigger unexpectedly or not arm/disarm correctly
- Possible no-start condition if immobilizer behavior is affected
- Intermittent loss of sensor input or false sensor activations
- Possible battery drain if circuit is being held at an abnormal voltage
What to check
- Read DTC with a capable scan tool; record freeze-frame and current data
- Visually inspect wiring and connectors at the BCM and affected sensors for damage, corrosion, or aftermarket splices
- Check for and identify any aftermarket alarm or device connected to the vehicle wiring
- Verify appropriate fuses and fusible links for the security circuit
- Measure battery voltage and note charging system voltage before/while testing
- Back-probe sensor power feed and BCM sensor input to observe voltage with ignition OFF/ON/engine running
Signal parameters
- Sensor power reference typically 5.0 V (nominal) for logic-level sensor circuits; high fault commonly triggered above ~5.5 V
- Some security sensors or feeds are ignition/battery-switched 12 V; expected ~12 V (nominal 12–14.5 V); high fault if substantially above charging system voltage
- Expected sensor input should be stable and within ±0.25 V of the specified reference for 5 V circuits
- Compare measured values to vehicle-specific wiring diagram and manufacturer specifications
Diagnostic algorithm
- Connect a scan tool, retrieve freeze-frame data and live sensor power circuit values. Note when the fault first set and any accompanying codes.
- Visually inspect harnesses, connectors, and grounds for the security sensors and BCM. Look for aftermarket splices or alarm modules.
- With ignition ON (do not start unless specified), back-probe the sensor power feed at the sensor connector and at the BCM input. Record voltages and compare to expected values.
- If voltage is higher than expected, disconnect the suspect sensor(s) or aftermarket device(s). Re-test voltage; if voltage returns to normal, the disconnected component is likely causing the high.
- If disconnecting devices does not change the high voltage, trace the wiring back toward the BCM looking for a short to a constant power source (pinched/chafed wire contacting battery feed). Repair any damaged wiring.
- Check related fuses and fusible links; replace if faulty and re-test. Confirm wiring repairs restore normal voltage range.
- If wiring and external components are verified good but the circuit still reports high, suspect BCM/module internal fault. Verify with a secondary BCM or follow manufacturer procedure before replacing (reprogramming may be required).
- Clear codes and perform function test/road test to confirm repair. Re-scan to ensure code does not return.
Likely causes
- Short to battery or accessory power on the sensor power feed (most common)
- Faulty security sensor or stuck component applying higher voltage to the circuit
- Aftermarket alarm or incorrect installation tied into the circuit
- Corroded/poor connector at sensor or BCM resulting in false high reading
- Internal BCM/module fault (less common, after wiring/items ruled out)
Fault status
Status
Security System Sensor Power Circuit High — over-voltage detected on sensor power/monitor circuit; inspect wiring, connectors, sensors and BCM.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email