Code
B220B
MITSUBISHI
B — Body
Buck up condenser
Views:
UK: 8
EN: 12
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in condenser/control circuit
- Faulty condenser fan motor or blower associated with condenser
- Failed condenser-related relay or fuse
- Bad pressure/temperature sensor or its connector for the condenser circuit
- Blocked or damaged condenser (physical obstruction, bent fins)
- Low or contaminated refrigerant charge causing abnormal pressures
Symptoms
- Reduced A/C cooling performance or warm cabin air
- Condenser fan(s) do not run when A/C is on or run intermittently
- Unusual fan noise or vibration from the condenser area
- Intermittent fault lamp or HVAC system warnings
- Poor engine cooling in some vehicles if condenser fan shared with engine radiator
What to check
- Read freeze frame and stored data with a capable scan tool; note conditions when code set
- Visual inspection of condenser, fans, wiring harnesses and connectors for damage or corrosion
- Check relevant fuses and relays for continuity and proper operation
- Verify condenser fan operation by commanding fan on with scan tool or applying 12V at connector
- Measure voltage and ground at fan motor and at sensor connectors with ignition and A/C on
- Check refrigerant system pressures with manifold gauges (observe high/low side pressures)
Signal parameters
- Fan motor supply: typical ~12 V when commanded on (varies by vehicle)
- Fan motor current draw: typical range 2–15 A depending on fan size; large dual fans draw more
- Pressure sensor output: typical analog range 0.5–4.5 V (model-dependent)
- Resistance at fan motor terminals: generally low (a few ohms); open/high resistance indicates motor fault
- Connector continuity: near 0 ohms for ground circuits, under 1 ohm preferred; supply circuit should show battery voltage
Diagnostic algorithm
- Record current freeze-frame data and clear the code, then re-run to confirm repeatability.
- Perform a visual inspection of the condenser, associated fans, sensors, wiring harnesses and connectors for damage, corrosion, or disconnection.
- With ignition ON and A/C requested, check for 12 V at the fan motor supply and a good ground at the motor connector. If voltage present but motor does not run, test motor by applying battery voltage directly (bench or at connector) to confirm motor condition.
- If fan does not receive command voltage, trace back to relay/fuse/module. Test relay and fuse; check control outputs from HVAC/BCM with scan tool or multimeter while commanding fan ON.
- Test the condenser pressure/temperature sensor signal (voltage or resistance) and compare to expected ranges for the model. Replace sensor if out of range or intermittent.
- Check refrigerant pressures with gauges. Low or very high pressures can cause pressure switch faults; remedy leaks or over/under charge as required.
- Inspect and clear any airflow obstructions in front of condenser and repair physical damage. Re-test system operation and monitor for code return.
- If electrical control circuitry (wiring, connectors, relays) checks good and components test OK, consider module-level diagnostics (BCM/HVAC control) per factory procedures or replace suspect module only after thorough verification.
Likely causes
- Defective condenser fan motor or fan not running
- Wiring connector corrosion or pin loss at condenser harness
- Blown fuse or sticking relay powering condenser fan or control circuit
- Faulty pressure switch/sensor reporting out-of-range values
- Physical blockage or debris reducing air flow through condenser
Fault status
Status
Condenser circuit fault detected (Buck up condenser). Possible electrical fault, sensor failure, fan motor issue, or condenser blockage affecting HVAC operation. Further diagnosis required.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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