What Does B2247 Mean?
This code indicates the Battery Control Module (BCM) or Powertrain Control Module (PCM) has detected an abnormal temperature reading from one or more sensors monitoring the high-voltage electric vehicle battery pack. The temperature may be reading too high, too low, or the sensor circuit may be experiencing an open, short, or intermittent connection. This affects the battery thermal management system which is critical for safe operation and battery longevity.
Safety Warning
Do not continue driving if battery temperature warning lights are active or if the vehicle displays reduced power messages. Overheating batteries pose fire and thermal runaway risks, while frozen batteries can be damaged by charging or discharging. Immediate diagnosis and repair is required.
Common Causes
45%
Faulty battery pack temperature sensor(s) or degraded sensor connections/wiring
30%
Battery thermal management system failure (coolant leak, failed cooling pump, or blocked passages)
15%
Actual battery pack overheating or thermal runaway condition due to cell degradation or fault
10%
Wiring harness damage, corrosion, or short circuit in temperature sensor circuits
Diagnostic Steps
1
Step 1: Using the scan tool, monitor live data for all battery pack temperature sensor readings and compare to ambient temperature. Look for sensors reading out of range (below -40°F or above 140°F), stuck values, or erratic fluctuations that indicate sensor or wiring faults.
2
Step 2: Perform a visual and physical inspection of the battery pack area (with HV system properly disabled per manufacturer procedure). Check all temperature sensor connectors for corrosion, moisture intrusion, loose pins, and damaged seals. Inspect wiring harnesses for chafing, heat damage, or rodent damage.
3
Step 3: Using a digital multimeter, measure resistance of each battery temperature sensor with connectors disconnected (typical NTC thermistors read 2-10k ohms at room temperature). Compare readings to manufacturer specifications and verify all sensors read similarly when at the same temperature.
4
Step 4: Check battery thermal management system operation: verify coolant level is correct, cooling pump activates when commanded via scan tool, coolant passages are not blocked, and coolant is circulating properly. Inspect for coolant leaks around battery cooling plates and hoses.
5
Step 5: If all sensors and cooling system components test normal, use thermal imaging camera (if available) to identify hot spots on battery pack that may indicate failing cells or internal faults requiring battery pack service or replacement.
6
Step 6: Clear codes, perform a test drive or charge cycle while monitoring live data for temperature trends. Verify all sensors respond appropriately and cooling system activates at proper thresholds before returning vehicle to service.
Estimated Repair Cost
$150 - $8,500
Parts + labor, varies by vehicle and location
This code indicates the Battery Control Module (BCM) or Powertrain Control Module (PCM) has detected an abnormal temperature reading from one or more sensors monitoring the high-voltage electric vehicle battery pack. The temperature may be reading too high, too low, or the sensor circuit may be expe...
The most common cause of B2247 (EV Battery Pack Temperature Fault) is: Faulty battery pack temperature sensor(s) or degraded sensor connections/wiring
Typical repair costs for B2247 range from $150 to $8,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Do not continue driving if battery temperature warning lights are active or if the vehicle displays reduced power messages. Overheating batteries pose fire and thermal runaway risks, while frozen batteries can be damaged by charging or discharging. Immediate diagnosis and repair is required.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2247 to identify the root cause.
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Quick Info
Category
Body
System
Electric Vehicle Battery Thermal Management System
Difficulty
Type
Generic (SAE)
Recommended Tools
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