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Home / DTC / B2452 — fuel pump heater auxiliary - Open circuit

B2452 — fuel pump heater auxiliary - Open circuit

Detailed page for trouble code B2452.

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22,491specific
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Code

B2452

LAND ROVER B — Body

fuel pump heater auxiliary - Open circuit

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in auxiliary heater circuit
  • Disconnected or corroded connector at pump/heater module
  • Blown fuse or faulty relay feeding the heater circuit
  • Failed auxiliary heater element inside the fuel pump module
  • Poor ground connection
  • Faulty body control module / ECU or incorrect driver output

Symptoms

  • Malfunction indicator light or warning message related to fuel system/heater
  • No auxiliary fuel pump heater operation (may affect cold-start emissions or pump performance in cold conditions)
  • Possible drivability issues in specific conditions (rare)

What to check

  • Visual inspection of wiring and connectors at rear of vehicle and fuel tank area for damage, corrosion, or disconnection
  • Check related fuses and relays for continuity and correct operation
  • Scan for freeze frame data and vehicle conditions when the code set (ambient temp, voltage, command state)
  • Measure voltage at heater connector while heater is commanded on (observe safety and fuel system precautions)
  • Measure continuity/resistance of heater circuit between connector and module/ground with battery disconnected

Signal parameters

  • Typical system supply voltage: ~12 V when heater is commanded ON (vehicle battery voltage range)
  • Expected continuity: low resistance (heater element usually low ohms); open circuit = infinite/OL on ohmmeter
  • Expected current draw: several amps when heater active (verify with clamp meter if safe)
  • Command signal: body/ECU provides switched supply or ground drive when heater enabled (verify with scan tool/oscilloscope)

Diagnostic algorithm

  1. Review manufacturer service manual for specific wiring diagrams, connector pinouts, fuse/relay locations and heater resistance specifications
  2. Retrieve freeze frame and live data to confirm heater was commanded and code conditions when set
  3. Perform a visual inspection: check for obvious damage, corrosion, loose or pushed-out pins at the pump module connector and harness routing near the tank and chassis
  4. Check fuses and relays supplying the heater circuit; replace if faulty and re-check for code return
  5. With battery disconnected, measure resistance between heater terminals at the pump module and at the ECU/driver connector. An open (OL) indicates broken wiring or failed heater element
  6. If resistance is open at module connector but present at ECU connector, perform continuity check along harness to locate break (backprobe connectors, wiggle test while monitoring)
  7. If wiring and connectors are good but heater remains open, remove fuel pump module per service procedure and bench-test the heater element directly to verify condition
  8. If heater element tests good and wiring is intact, check ECU/body control driver output for proper switching (voltage or ground) when commanded; replace ECU only after confirming component fault
  9. After repairs, clear codes and perform drive or command cycle to confirm no reoccurrence

Likely causes

  • Open/disconnected connector at fuel pump module
  • Damaged wiring harness near fuel tank (chafing, pinched, broken)
  • Failed heater element in pump module

Fault status

⚠️ Status
Fuel pump heater auxiliary — Open circuit detected (no continuity/current in auxiliary heater circuit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B2451 B2450 B2453 P0230 P0231 P0232
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B2452

MITSUBISHI B — Body

Display error

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in auxiliary heater circuit
  • Disconnected or corroded connector at pump/heater module
  • Blown fuse or faulty relay feeding the heater circuit
  • Failed auxiliary heater element inside the fuel pump module
  • Poor ground connection
  • Faulty body control module / ECU or incorrect driver output

Symptoms

  • Malfunction indicator light or warning message related to fuel system/heater
  • No auxiliary fuel pump heater operation (may affect cold-start emissions or pump performance in cold conditions)
  • Possible drivability issues in specific conditions (rare)

What to check

  • Visual inspection of wiring and connectors at rear of vehicle and fuel tank area for damage, corrosion, or disconnection
  • Check related fuses and relays for continuity and correct operation
  • Scan for freeze frame data and vehicle conditions when the code set (ambient temp, voltage, command state)
  • Measure voltage at heater connector while heater is commanded on (observe safety and fuel system precautions)
  • Measure continuity/resistance of heater circuit between connector and module/ground with battery disconnected

Signal parameters

  • Typical system supply voltage: ~12 V when heater is commanded ON (vehicle battery voltage range)
  • Expected continuity: low resistance (heater element usually low ohms); open circuit = infinite/OL on ohmmeter
  • Expected current draw: several amps when heater active (verify with clamp meter if safe)
  • Command signal: body/ECU provides switched supply or ground drive when heater enabled (verify with scan tool/oscilloscope)

Diagnostic algorithm

  1. Review manufacturer service manual for specific wiring diagrams, connector pinouts, fuse/relay locations and heater resistance specifications
  2. Retrieve freeze frame and live data to confirm heater was commanded and code conditions when set
  3. Perform a visual inspection: check for obvious damage, corrosion, loose or pushed-out pins at the pump module connector and harness routing near the tank and chassis
  4. Check fuses and relays supplying the heater circuit; replace if faulty and re-check for code return
  5. With battery disconnected, measure resistance between heater terminals at the pump module and at the ECU/driver connector. An open (OL) indicates broken wiring or failed heater element
  6. If resistance is open at module connector but present at ECU connector, perform continuity check along harness to locate break (backprobe connectors, wiggle test while monitoring)
  7. If wiring and connectors are good but heater remains open, remove fuel pump module per service procedure and bench-test the heater element directly to verify condition
  8. If heater element tests good and wiring is intact, check ECU/body control driver output for proper switching (voltage or ground) when commanded; replace ECU only after confirming component fault
  9. After repairs, clear codes and perform drive or command cycle to confirm no reoccurrence

Likely causes

  • Open/disconnected connector at fuel pump module
  • Damaged wiring harness near fuel tank (chafing, pinched, broken)
  • Failed heater element in pump module

Fault status

⚠️ Status
Fuel pump heater auxiliary — Open circuit detected (no continuity/current in auxiliary heater circuit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B2451 B2450 B2453 P0230 P0231 P0232
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

B2452

Other B — Body

Aux Heater Fuel Pump Circuit Open

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in auxiliary heater circuit
  • Disconnected or corroded connector at pump/heater module
  • Blown fuse or faulty relay feeding the heater circuit
  • Failed auxiliary heater element inside the fuel pump module
  • Poor ground connection
  • Faulty body control module / ECU or incorrect driver output

Symptoms

  • Malfunction indicator light or warning message related to fuel system/heater
  • No auxiliary fuel pump heater operation (may affect cold-start emissions or pump performance in cold conditions)
  • Possible drivability issues in specific conditions (rare)

What to check

  • Visual inspection of wiring and connectors at rear of vehicle and fuel tank area for damage, corrosion, or disconnection
  • Check related fuses and relays for continuity and correct operation
  • Scan for freeze frame data and vehicle conditions when the code set (ambient temp, voltage, command state)
  • Measure voltage at heater connector while heater is commanded on (observe safety and fuel system precautions)
  • Measure continuity/resistance of heater circuit between connector and module/ground with battery disconnected

Signal parameters

  • Typical system supply voltage: ~12 V when heater is commanded ON (vehicle battery voltage range)
  • Expected continuity: low resistance (heater element usually low ohms); open circuit = infinite/OL on ohmmeter
  • Expected current draw: several amps when heater active (verify with clamp meter if safe)
  • Command signal: body/ECU provides switched supply or ground drive when heater enabled (verify with scan tool/oscilloscope)

Diagnostic algorithm

  1. Review manufacturer service manual for specific wiring diagrams, connector pinouts, fuse/relay locations and heater resistance specifications
  2. Retrieve freeze frame and live data to confirm heater was commanded and code conditions when set
  3. Perform a visual inspection: check for obvious damage, corrosion, loose or pushed-out pins at the pump module connector and harness routing near the tank and chassis
  4. Check fuses and relays supplying the heater circuit; replace if faulty and re-check for code return
  5. With battery disconnected, measure resistance between heater terminals at the pump module and at the ECU/driver connector. An open (OL) indicates broken wiring or failed heater element
  6. If resistance is open at module connector but present at ECU connector, perform continuity check along harness to locate break (backprobe connectors, wiggle test while monitoring)
  7. If wiring and connectors are good but heater remains open, remove fuel pump module per service procedure and bench-test the heater element directly to verify condition
  8. If heater element tests good and wiring is intact, check ECU/body control driver output for proper switching (voltage or ground) when commanded; replace ECU only after confirming component fault
  9. After repairs, clear codes and perform drive or command cycle to confirm no reoccurrence

Likely causes

  • Open/disconnected connector at fuel pump module
  • Damaged wiring harness near fuel tank (chafing, pinched, broken)
  • Failed heater element in pump module

Fault status

⚠️ Status
Fuel pump heater auxiliary — Open circuit detected (no continuity/current in auxiliary heater circuit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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