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Fuel Fired Booster Heater Module (AHCM)

WARNING: This page is about a different car, the 2012 Land Rover Range Rover Sport and 2011 Land Rover Range Rover Sport. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Diagnosis by substitution from a donor vehicle is NOT  acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.
NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
NOTE: Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).
NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
NOTE: Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.
NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

The table below lists all Diagnostic Trouble Codes (DTCs) that could be logged in the Fuel Fired Booster Heater Module, for additional Diagnosis and Testing information refer to the relevant Diagnosis and Testing information. Refer to Fuel Fired Booster Heater .

NOTE: Where an 'on demand self-test' is referred to, this can be accessed via the 'DTC Monitor' tab on the manufacturers approved diagnostic system.
DTC Description Possible Causes Action
B1206-53 Crash Occurred - deactivated
  • Crash signal received over CAN network
NOTE: Event information - the restraints control module has recorded a crash event
  • Using the manufacturer approved diagnostic system, check other modules for related diagnostic trouble codes
B1D22-11 Coolant Temperature Sensor - circuit short to ground
  • Fuel fired booster heater coolant temperature sensor internal fault
  • Check and install a new fuel fired booster heater coolant temperature sensor 
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D22-15 Coolant Temperature Sensor - circuit short to battery or open
  • Fuel fired booster heater coolant temperature sensor internal fault
  • Check and install a new fuel fired booster heater coolant temperature sensor 
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D23-13 Overheat Sensor - circuit open
  • Fuel fired booster heater coolant temperature sensor internal fault
  • Check and install a new fuel fired booster heater coolant temperature sensor 
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D24-11 Glow Plug - circuit short to ground
  • Fuel fired booster heater glow plug internal fault
B1D24-15 Glow Plug - circuit short to battery or open
  • Fuel fired booster heater glow plug internal fault
B1D25-11 Heater Fuel Pump - circuit short to ground
  • Heater fuel pump circuit short to ground
  • Heater fuel pump failure
  • Refer to the electrical circuit diagrams and check the fuel fired booster heater fuel pump and circuit for short to ground
  • Repair the circuit or check and install a new fuel fired booster heater fuel pump  as required
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D25-15 Heater Fuel Pump - circuit short to battery or open
  • Heater fuel pump circuit short to power, open circuit
  • Heater fuel pump failure
  • Refer to the electrical circuit diagrams and check the fuel fired booster heater fuel pump and circuit for short to power, open circuit
  • Repair the circuit or check and install a new fuel fired booster heater fuel pump  as required
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D26-11 Combustion Air Blower - circuit short to ground
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • If the diagnostic trouble code reoccurs check and install a new fuel fired booster heater module
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
B1D26-15 Combustion Air Blower - circuit short to battery or open
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • If the diagnostic trouble code reoccurs check and install a new fuel fired booster heater module
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
B1D26-92 Combustion Air Blower - performance or incorrect operation
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for reoccurrence of the diagnostic trouble code
  • If the diagnostic trouble code reoccurs check and install a new fuel fired booster heater module
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
B1D26-93 Combustion Air Blower - no operation
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for reoccurrence of the diagnostic trouble code
  • If the diagnostic trouble code reoccurs check and install a new fuel fired booster heater module
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
B1D27-11 Heater Coolant Pump - circuit short to ground
  • Heater coolant pump circuit short to ground
  • Heater coolant pump failure
  • Refer to the electrical circuit diagrams and check the fuel fired booster heater water pump and circuit for short to ground
  • Repair the circuit or check and install a new fuel fired booster heater water pump  as required
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D27-15 Heater Coolant Pump - circuit short to battery or open
  • Heater coolant pump circuit short to power, open circuit
  • Heater coolant pump failure
  • Refer to the electrical circuit diagrams and check the fuel fired booster heater water pump and circuit for short to power, open circuit
  • Repair the circuit or check and install a new fuel fired booster heater water pump  as required
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D28-11 Fuel Pre-heater - circuit short to ground
NOTE: The pre heat is performed by the ignition glow plug
  • Fuel fired booster heater glow plug internal fault
B1D28-15 Fuel Pre-heater - circuit short to battery or open
NOTE: The pre heat is performed by the ignition glow plug
  • Fuel fired booster heater glow plug internal fault
B1D29-93 No Start, Even After Restart Attempt - no operation
  • No fuel present at fuel fired booster heater module
  • Exhaust system blocked
  • Air intake blocked
  • Check vehicle fuel level
  • Check fuel lines to fuel fired booster heater module for blockage, kinking or damage
  • Check exhaust system and air intake for blockage, kinking or damage
  • Check fuel for aeration and correct fuel delivery
  • Check vehicle is not parked on an incline when parking heater is operated
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D30-93 No Start In Test Mode - no operation
  • No fuel present at fuel fired booster heater module
  • Exhaust system blocked
  • Air intake blocked
  • Check vehicle fuel level
  • Check fuel lines to Fuel fired booster heater module for blockage, kinking or damage
  • Check exhaust system and air intake for blockage, kinking or damage
  • Check fuel for aeration and correct fuel delivery
  • Check vehicle is not parked on an incline when parking heater is operated
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D31-94 Flame Detected Prior to Normal Operation - unexpected operation
NOTE: The glow plug and flame sensor are a combined unit
  • Glow plug circuit fault
B1D32-92 Multiple Flame Interruption During Heating Cycle - performance or incorrect operation
  • No fuel present at fuel fired booster heater module
  • Exhaust system blocked
  • Air intake blocked
  • Check vehicle fuel level
  • Check fuel lines to Fuel fired booster heater module for blockage, kinking or damage
  • Check exhaust system and air intake for blockage, kinking or damage
  • Check fuel for aeration and correct fuel delivery
  • Check vehicle is not parked on an incline when parking heater is operated
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D33-92 Flame Interruption During Normal Operation - performance or incorrect operation
  • No fuel present at fuel fired booster heater module
  • Exhaust system blocked
  • Air intake blocked
  • Check vehicle fuel level
  • Check fuel lines to Fuel fired booster heater module for blockage, kinking or damage
  • Check exhaust system and air intake for blockage, kinking or damage
  • Check fuel for aeration and correct fuel delivery
  • Check vehicle is not parked on an incline when parking heater is operated
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D34-68 Heater In Lock Out Mode - event information
  • Fuel fired booster heater system fault
NOTE: For information only, rectify other stored fuel fired booster heater diagnostic trouble codes prior to this diagnostic trouble code
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for stored diagnostic trouble codes
  • Check for correct operation
B1D63-11 External Control Relay - circuit short to ground
  • Fuel fired booster heater module failure
  • Check and install a new fuel fired booster heater module as required
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
B1D63-15 External Control Relay - circuit short to battery or open
  • Fuel fired booster heater module failure
  • Check and install a new fuel fired booster heater module as required
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
U0010-00 Medium Speed CAN Communication Bus - no sub type information
  • Medium speed CAN communication bus off
  • Using the manufacturer approved diagnostic system, complete a CAN network integrity test
U0028-08 Vehicle Communication Bus A - Bus Signal / Message Failures
  • Medium speed CAN communication bus off
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, complete a CAN network integrity test
U0300-00 Internal Control Module Software Incompatibility - no sub type information
  • Fuel fired booster heater module not configured or incorrectly configured
  • Re-configure the fuel fired booster heater module using the manufacturer approved diagnostic system (Module programming/Configure existing module/Auxiliary heater control module)
U2101-00 Control Module Configuration Incompatible - no sub type information
  • Fuel fired booster heater module not configured or incorrectly configured
  • Central junction box not configured correctly
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for reoccurrence of the diagnostic trouble code
  • If the diagnostic trouble code returns
  • Using the manufacturer approved diagnostic system check and up-date the car configuration file as required
  • Re-configure the Fuel fired booster heater module using the manufacturer approved diagnostic system
  • Check for stored diagnostic trouble codes
  • Check for correct operation
U3000-16 Control Module - circuit voltage below threshold
  • Fuel fired booster heater module power circuit fault
  • Battery/charging system fault
  • Check other modules for related diagnostic trouble codes
  • If other modules contain low voltage related diagnostic trouble codes, suspect a common cause (battery/charging system fault)
  • If not, refer to the electrical circuit diagrams and check the power and ground circuits to the fuel fired booster heater module
  • Check for stored diagnostic trouble codes
  • Check for correct operation
U3000-17 Control Module - circuit voltage above threshold
  • Charging system fault
  • Fuel fired booster heater module failure
  • Check other modules for related diagnostic trouble codes
  • If other modules contain high voltage related diagnostic trouble codes, suspect a common cause (battery/charging system fault)
  • If not, refer to the electrical circuit diagrams and check the power and ground circuits to the fuel fired booster heater module
  • Check for stored diagnostic trouble codes
  • Check for correct operation
U3000-43 Control Module - special memory failure
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for reoccurrence of the diagnostic trouble code
  • If the diagnostic trouble code returns
  • Install a new fuel fired booster heater module as required
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
U3000-49 Control Module - internal electronic failure
  • Fuel fired booster heater module failure
  • Using the manufacturer approved diagnostic system, record then clear any stored diagnostic trouble codes then conduct the fuel fired booster heater operation check  (Setup and configuration/auxiliary heater/operation check)
  • Check for reoccurrence of the diagnostic trouble code
  • If the diagnostic trouble code returns
  • Install a new fuel fired booster heater module as required
  • Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
U3003-62 Battery Voltage - signal compare failure
  • There is a difference of more than 2 volts between the power supply to the fuel fired booster heater and the battery voltage value broadcast via the CAN bus
  • Check other modules for related diagnostic trouble codes
  • If other modules contain voltage related diagnostic trouble codes, suspect a common cause (battery/charging system fault)
  • If not, refer to the electrical circuit diagrams and check the power and ground circuits to the fuel fired booster heater module
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