What Does B2467 Mean?
This code indicates that the auxiliary heater (typically a fuel-fired or electric supplemental heating system) has exceeded its programmed cool-down time period after operation. The Body Control Module (BCM) or climate control module has detected that the auxiliary heater did not properly cool down within the expected time frame, which may indicate a stuck circulation pump, coolant flow restriction, faulty temperature sensor, or malfunctioning heater control unit. This system is commonly found in diesel vehicles or vehicles with supplemental cabin heating systems.
Common Causes
35%
Faulty auxiliary heater coolant circulation pump stuck running or failed
30%
Defective auxiliary heater temperature sensor providing incorrect readings
20%
Malfunctioning auxiliary heater control unit or module
10%
Coolant system restriction or air pocket preventing proper heat dissipation
5%
Wiring harness or connector issues between BCM and auxiliary heater components
Diagnostic Steps
1
Step 1: Perform visual inspection of the auxiliary heater assembly, coolant circulation pump, and all associated wiring/connectors for physical damage, corrosion, or disconnected components. Check coolant level and verify proper system fill.
2
Step 2: Monitor live data for auxiliary heater temperature sensor readings using existing scan tool connection during and after heater operation. Compare actual temperature readings to expected cool-down profile (should decrease steadily after shutdown). Temperature should drop below operating threshold within manufacturer specified time (typically 5-15 minutes).
3
Step 3: Test auxiliary heater coolant circulation pump operation using multimeter to verify voltage supply (typically 12V) at pump connector during cool-down cycle. Listen for pump operation and check for proper coolant flow through heater circuit. Measure pump current draw to identify seized or weak pump motor.
4
Step 4: Test auxiliary heater temperature sensor resistance using multimeter at various temperatures and compare to manufacturer specifications (typically NTC thermistor with higher resistance when cold). Check sensor circuit wiring for shorts, opens, or high resistance (should be less than 5 ohms to ground).
5
Step 5: If all sensors and pump test within specifications, perform auxiliary heater control module self-diagnostic routines through scan tool and check for software updates. Verify BCM communication with heater module on vehicle network.
6
Step 6: Clear codes, perform auxiliary heater operation and cool-down cycle, and monitor for code recurrence while observing all parameters in real-time to confirm repair effectiveness.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code indicates that the auxiliary heater (typically a fuel-fired or electric supplemental heating system) has exceeded its programmed cool-down time period after operation. The Body Control Module (BCM) or climate control module has detected that the auxiliary heater did not properly cool down ...
The most common cause of B2467 (Aux Heater Cool Down Time Exceeded (may be con to a453-5 )) is: Faulty auxiliary heater coolant circulation pump stuck running or failed
Typical repair costs for B2467 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive as this affects only the supplemental heating system and does not impact primary vehicle operation. Repair should be completed within a reasonable timeframe to prevent potential auxiliary heater component damage from prolonged excessive heat exposure and to restore supplemental heating functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2467 to identify the root cause.
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Quick Info
Category
Body
System
Auxiliary Climate Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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