Code
B1324
HUMMER
B — Body
A/C Refrigerant Overpressure
Views:
UK: 5
EN: 13
RU: 7
AI status
Completed
Completed
100%
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
- Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
- 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.
- Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
- 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.
- If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
- If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
- Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
- Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
- 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
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Code
B1324
MITSUBISHI
B — Body
Driver side -ÅP/W ECU
Views:
UK: 7
EN: 18
RU: 7
AI status
Completed
Completed
100%
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
- Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
- 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.
- Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
- 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.
- If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
- If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
- Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
- Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
- 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
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0
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Code
B1324
Other
B — Body
Door Ajar Lamp Circuit Open
Views:
UK: 14
EN: 25
RU: 22
AI status
Completed
Completed
100%
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
- Safety first: wear eye protection and gloves; work in well‑ventilated area; use approved refrigerant recovery equipment before opening system
- 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.
- Visually inspect condenser, cooling fans, and surrounding airflow paths. Repair/clean as needed. Verify fans run when A/C is commanded.
- 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.
- If high side is elevated, verify refrigerant charge by recovering and weighing system. Remove excess refrigerant if overcharged and retest.
- If charge is correct, inspect/replace expansion valve/orifice tube and receiver/drier/accumulator as contaminated/restricted components often cause high head pressure.
- Test high‑pressure sensor/switch: verify wiring for opens/shorts, check sensor output with scan tool or multimeter, and replace if out of specification.
- Inspect compressor operation: check clutch engagement, listen for mechanical noise, and verify no internal restriction. Replace compressor if internally failed.
- 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
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