Code
B2440
HUMMER
B — Body
Seat Back Heater Sensor
Views:
UK: 16
EN: 30
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or high-resistance sensor element (broken heater/thermistor)
- Short to ground or to battery voltage in sensor harness
- Corroded, loose or damaged connector or terminal at the seat sensor
- Water/moisture intrusion inside the seat causing short or loss of continuity
- Damaged wiring harness (chafing, pinched, broken conductor)
- Faulty seat heater assembly (sensor integrated into cushion/back)
Symptoms
- Seat back heater does not heat or heats unpredictably
- Seat heater indicator lamp may not illuminate or may flash/fail
- Stored B2440 DTC (and possibly related seat heater codes) visible with scan tool
- Inconsistent or no temperature feedback in seat heating controls
- Possible intermittent operation that changes with seat movement or moisture exposure
What to check
- Scan for additional related DTCs and record freeze frame/live data
- Visually inspect seat back, connectors under seat, and wiring harness for damage, corrosion or moisture
- Backprobe sensor connector with scan tool to view live sensor values while operating seat heater
- Perform wiggle test of harness/connectors while monitoring live data for intermittent changes
- Measure resistance of the sensor element at the connector with the seat removed and at ambient temperature
- Check for short to ground and short to battery voltage on sensor circuit with multimeter
Signal parameters
- Sensor type: temperature sensing element (thermistor) — resistance varies with temperature
- Typical interface: low-voltage sensing circuit to seat control module (voltage signal usually 0–5 V or resistance measurement)
- Expected behavior: resistance decreases/increases predictably with temperature; open-circuit or near-infinite resistance indicates a break; very low resistance may indicate a short
- Exact resistance/voltage specifications vary by model — consult the vehicle service manual for manufacturer values
Diagnostic algorithm
- Use a scan tool to read B2440 and any related codes; note freeze frame and live data for seat back sensor.
- Visually inspect seat back, heater cover, and connector(s) under the seat for physical damage, corrosion, or moisture. Repair any visible issues.
- With ignition on, backprobe the sensor connector and observe live sensor values on the scan tool while changing seat heating settings; check for response and stability.
- With ignition off, disconnect the sensor connector and measure sensor resistance across the sensor terminals at ambient temperature. Compare to manufacturer spec. (If out of range, replace sensor/heater assembly.)
- Check continuity between the sensor connector and the seat control module connector; inspect for shorts to ground and battery with an ohmmeter/voltmeter.
- Repair or replace damaged wiring, terminals, or connectors. If corrosion or water ingress is present, dry and replace affected components.
- If wiring and sensor bench tests are within spec, inspect and test the seat/comfort control module and its connectors; reprogram or replace module only after verifying wiring/sensor integrity.
- Clear codes, perform functional test of seat heating, and verify the DTC does not return during operation and after road test.
Likely causes
- Connector corrosion or poor terminal contact at the seat back sensor
- Broken/strained wiring or pinched harness between seat and module
- Sensor element open or resistance out of specified range due to damage or moisture
- Seat heater assembly failure (integrated sensor)
Fault status
Status
Seat back heater sensor circuit fault detected — sensor signal out of range (open/short/incorrect resistance).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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Code
B2440
Other
B — Body
Passenger Sid, Side crash sensor mount fault
Views:
UK: 31
EN: 36
RU: 34
AI status
Completed
Completed
100%
Causes
- Open or high-resistance sensor element (broken heater/thermistor)
- Short to ground or to battery voltage in sensor harness
- Corroded, loose or damaged connector or terminal at the seat sensor
- Water/moisture intrusion inside the seat causing short or loss of continuity
- Damaged wiring harness (chafing, pinched, broken conductor)
- Faulty seat heater assembly (sensor integrated into cushion/back)
Symptoms
- Seat back heater does not heat or heats unpredictably
- Seat heater indicator lamp may not illuminate or may flash/fail
- Stored B2440 DTC (and possibly related seat heater codes) visible with scan tool
- Inconsistent or no temperature feedback in seat heating controls
- Possible intermittent operation that changes with seat movement or moisture exposure
What to check
- Scan for additional related DTCs and record freeze frame/live data
- Visually inspect seat back, connectors under seat, and wiring harness for damage, corrosion or moisture
- Backprobe sensor connector with scan tool to view live sensor values while operating seat heater
- Perform wiggle test of harness/connectors while monitoring live data for intermittent changes
- Measure resistance of the sensor element at the connector with the seat removed and at ambient temperature
- Check for short to ground and short to battery voltage on sensor circuit with multimeter
Signal parameters
- Sensor type: temperature sensing element (thermistor) — resistance varies with temperature
- Typical interface: low-voltage sensing circuit to seat control module (voltage signal usually 0–5 V or resistance measurement)
- Expected behavior: resistance decreases/increases predictably with temperature; open-circuit or near-infinite resistance indicates a break; very low resistance may indicate a short
- Exact resistance/voltage specifications vary by model — consult the vehicle service manual for manufacturer values
Diagnostic algorithm
- Use a scan tool to read B2440 and any related codes; note freeze frame and live data for seat back sensor.
- Visually inspect seat back, heater cover, and connector(s) under the seat for physical damage, corrosion, or moisture. Repair any visible issues.
- With ignition on, backprobe the sensor connector and observe live sensor values on the scan tool while changing seat heating settings; check for response and stability.
- With ignition off, disconnect the sensor connector and measure sensor resistance across the sensor terminals at ambient temperature. Compare to manufacturer spec. (If out of range, replace sensor/heater assembly.)
- Check continuity between the sensor connector and the seat control module connector; inspect for shorts to ground and battery with an ohmmeter/voltmeter.
- Repair or replace damaged wiring, terminals, or connectors. If corrosion or water ingress is present, dry and replace affected components.
- If wiring and sensor bench tests are within spec, inspect and test the seat/comfort control module and its connectors; reprogram or replace module only after verifying wiring/sensor integrity.
- Clear codes, perform functional test of seat heating, and verify the DTC does not return during operation and after road test.
Likely causes
- Connector corrosion or poor terminal contact at the seat back sensor
- Broken/strained wiring or pinched harness between seat and module
- Sensor element open or resistance out of specified range due to damage or moisture
- Seat heater assembly failure (integrated sensor)
Fault status
Status
Seat back heater sensor circuit fault detected — sensor signal out of range (open/short/incorrect resistance).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Repair manuals
Brands with available manuals
6,117
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