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Home / DTC / B1324 — A/C Refrigerant Overpressure

B1324 — A/C Refrigerant Overpressure

Detailed page for trouble code B1324.

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Code

B1324

HUMMER B — Body

A/C Refrigerant Overpressure

Brand: HUMMER
Type: B — Body
Views: UK: 15 EN: 24 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Excessive refrigerant charge (overcharge)
  • Restricted flow in condenser, orifice tube, thermal expansion valve, or receiver/drier
  • Failed expansion device stuck closed
  • Condenser blockage or damaged fins limiting airflow
  • Cooling fan failure or poor engine cooling causing high head pressure
  • Faulty high‑pressure sensor/pressure switch or wiring/connector issues

Symptoms

  • A/C compressor disabled or not engaging
  • Warm or reduced cooling from vents
  • Intermittent compressor cycling or rapid on/off
  • Visible oil or refrigerant residue near fittings (possible leak or relief event)
  • High under‑hood temperatures at condenser area
  • DTC present and may be accompanied by other HVAC codes

What to check

  • Retrieve all HVAC and freeze‑frame data with a scan tool; note ambient temperature and operating conditions
  • Visually inspect condenser, radiator area and cooling fans for debris, damage, and fan operation
  • Check wiring and connectors at high‑pressure sensor/switch and compressor clutch circuit for corrosion or damage
  • Connect manifold gauges to high and low service ports and record pressures at idle and during A/C operation
  • Weigh recovered refrigerant if system evacuation is required to confirm overcharge
  • Inspect expansion device/orifice tube and accumulator/receiver‑drier for contamination or restriction

Signal parameters

  • High‑side pressure (manifold): elevated above normal operating range for ambient temp — indicates overpressure
  • Low‑side pressure: may be higher than normal if flow is restricted
  • Pressure sensor voltage/current: out‑of‑range compared to manufacturer specification
  • Compressor control signal from PCM/BODY module: command present but clutch not engaging if protected
  • Cooling fan speed (RPM) or status: fan not running when commanded

Diagnostic algorithm

  1. Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
  2. Read and record DTCs, freeze frame and ambient conditions with scan tool. Clear codes and attempt to re‑create under controlled conditions to verify repeatability.
  3. Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
  4. With gauges connected and A/C operating, compare high/low pressures to expected ranges for the ambient temperature. Note any rapid rise in high side pressure.
  5. If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
  6. If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
  7. Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
  8. Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
  9. After repairs, evacuate, vacuum and charge to specification, clear codes, and perform a full functional test including road or idle testing under A/C load to confirm issue resolved.

Likely causes

  • Overcharged system or recent improper service
  • Condenser blocked with debris or bent fins reducing airflow
  • Cooling fan not operating under A/C load
  • Faulty high‑side pressure sensor or open/short in its circuit
  • Expansion valve or orifice tube partially/plugs restricting flow

Fault status

⚠️ Status
A/C refrigerant overpressure detected — high‑side pressure exceeded safe limit; compressor disabled to protect system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

B1320 B1323 B1325 B1330 B1234
Repair manuals

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Code

B1324

MITSUBISHI B — Body

Driver side -ÅP/W ECU

Brand: MITSUBISHI
Type: B — Body
Views: UK: 16 EN: 28 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Excessive refrigerant charge (overcharge)
  • Restricted flow in condenser, orifice tube, thermal expansion valve, or receiver/drier
  • Failed expansion device stuck closed
  • Condenser blockage or damaged fins limiting airflow
  • Cooling fan failure or poor engine cooling causing high head pressure
  • Faulty high‑pressure sensor/pressure switch or wiring/connector issues

Symptoms

  • A/C compressor disabled or not engaging
  • Warm or reduced cooling from vents
  • Intermittent compressor cycling or rapid on/off
  • Visible oil or refrigerant residue near fittings (possible leak or relief event)
  • High under‑hood temperatures at condenser area
  • DTC present and may be accompanied by other HVAC codes

What to check

  • Retrieve all HVAC and freeze‑frame data with a scan tool; note ambient temperature and operating conditions
  • Visually inspect condenser, radiator area and cooling fans for debris, damage, and fan operation
  • Check wiring and connectors at high‑pressure sensor/switch and compressor clutch circuit for corrosion or damage
  • Connect manifold gauges to high and low service ports and record pressures at idle and during A/C operation
  • Weigh recovered refrigerant if system evacuation is required to confirm overcharge
  • Inspect expansion device/orifice tube and accumulator/receiver‑drier for contamination or restriction

Signal parameters

  • High‑side pressure (manifold): elevated above normal operating range for ambient temp — indicates overpressure
  • Low‑side pressure: may be higher than normal if flow is restricted
  • Pressure sensor voltage/current: out‑of‑range compared to manufacturer specification
  • Compressor control signal from PCM/BODY module: command present but clutch not engaging if protected
  • Cooling fan speed (RPM) or status: fan not running when commanded

Diagnostic algorithm

  1. Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
  2. Read and record DTCs, freeze frame and ambient conditions with scan tool. Clear codes and attempt to re‑create under controlled conditions to verify repeatability.
  3. Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
  4. With gauges connected and A/C operating, compare high/low pressures to expected ranges for the ambient temperature. Note any rapid rise in high side pressure.
  5. If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
  6. If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
  7. Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
  8. Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
  9. After repairs, evacuate, vacuum and charge to specification, clear codes, and perform a full functional test including road or idle testing under A/C load to confirm issue resolved.

Likely causes

  • Overcharged system or recent improper service
  • Condenser blocked with debris or bent fins reducing airflow
  • Cooling fan not operating under A/C load
  • Faulty high‑side pressure sensor or open/short in its circuit
  • Expansion valve or orifice tube partially/plugs restricting flow

Fault status

⚠️ Status
A/C refrigerant overpressure detected — high‑side pressure exceeded safe limit; compressor disabled to protect system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

B1320 B1323 B1325 B1330 B1234
406

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

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Code

B1324

Other B — Body

Door Ajar Lamp Circuit Open

Brand: Other
Type: B — Body
Views: UK: 23 EN: 36 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Excessive refrigerant charge (overcharge)
  • Restricted flow in condenser, orifice tube, thermal expansion valve, or receiver/drier
  • Failed expansion device stuck closed
  • Condenser blockage or damaged fins limiting airflow
  • Cooling fan failure or poor engine cooling causing high head pressure
  • Faulty high‑pressure sensor/pressure switch or wiring/connector issues

Symptoms

  • A/C compressor disabled or not engaging
  • Warm or reduced cooling from vents
  • Intermittent compressor cycling or rapid on/off
  • Visible oil or refrigerant residue near fittings (possible leak or relief event)
  • High under‑hood temperatures at condenser area
  • DTC present and may be accompanied by other HVAC codes

What to check

  • Retrieve all HVAC and freeze‑frame data with a scan tool; note ambient temperature and operating conditions
  • Visually inspect condenser, radiator area and cooling fans for debris, damage, and fan operation
  • Check wiring and connectors at high‑pressure sensor/switch and compressor clutch circuit for corrosion or damage
  • Connect manifold gauges to high and low service ports and record pressures at idle and during A/C operation
  • Weigh recovered refrigerant if system evacuation is required to confirm overcharge
  • Inspect expansion device/orifice tube and accumulator/receiver‑drier for contamination or restriction

Signal parameters

  • High‑side pressure (manifold): elevated above normal operating range for ambient temp — indicates overpressure
  • Low‑side pressure: may be higher than normal if flow is restricted
  • Pressure sensor voltage/current: out‑of‑range compared to manufacturer specification
  • Compressor control signal from PCM/BODY module: command present but clutch not engaging if protected
  • Cooling fan speed (RPM) or status: fan not running when commanded

Diagnostic algorithm

  1. Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
  2. Read and record DTCs, freeze frame and ambient conditions with scan tool. Clear codes and attempt to re‑create under controlled conditions to verify repeatability.
  3. Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
  4. With gauges connected and A/C operating, compare high/low pressures to expected ranges for the ambient temperature. Note any rapid rise in high side pressure.
  5. If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
  6. If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
  7. Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
  8. Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
  9. After repairs, evacuate, vacuum and charge to specification, clear codes, and perform a full functional test including road or idle testing under A/C load to confirm issue resolved.

Likely causes

  • Overcharged system or recent improper service
  • Condenser blocked with debris or bent fins reducing airflow
  • Cooling fan not operating under A/C load
  • Faulty high‑side pressure sensor or open/short in its circuit
  • Expansion valve or orifice tube partially/plugs restricting flow

Fault status

⚠️ Status
A/C refrigerant overpressure detected — high‑side pressure exceeded safe limit; compressor disabled to protect system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

B1320 B1323 B1325 B1330 B1234
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