B1238

Code

FIAT B — Body

Overheating

Brand: FIAT

Type: B — Body

Views: UK: 19 EN: 35 RU: 27

AI status

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Page language: EN

Read and record all stored and pending DTCs and freeze-frame data with a scan tool
Visually inspect coolant level and condition in reservoir and radiator (when cool)
Inspect radiator, hoses, clamps, water pump and connections for leaks or damage
Check for external radiator or condenser blockage (dirt, debris)
Verify cooling fan operation: command fan ON with scan tool and observe operation; check fuses/relays/wiring
Monitor live engine coolant temperature (ECT) sensor values vs ambient and expected warm-up curve

Engine coolant temperature (ECT) — cold ambient ~ambient°C; normal operating range typically 80–105°C; overheating events often >110–120°C
ECT sensor voltage/resistance — compare to FIAT specification (voltage low/high or out-of-range indicates sensor fault)
Fan command status — PCM requests fan ON (active) or OFF
Fan actual state — fan motor current or RPM when commanded ON
Thermostat opening temperature — verify opens near specified temp (e.g., ~88–95°C depending on model)
Cooling system pressure — should hold specified cap pressure (e.g., 1.0–1.5 bar) without leak

Connect scan tool, record all codes and freeze-frame data; note engine speed, load, coolant temp at fault occurrence and pending codes.
Inspect coolant level/condition and visually check for leaks; top-up coolant if low and re-test (do not open hot system).
With engine cold, start and monitor ECT sensor values during warm-up; confirm temperature rises progressively and stabilizes in normal range.
Command cooling fan(s) ON via scan tool at various temps or with ignition engine off (if supported) and verify fans run; check fuses, relays and wiring if fans do not operate.
Test thermostat by observing coolant flow at upper radiator hose as engine warms — lack of flow may indicate stuck thermostat.
Perform pressure test on cooling system to locate leaks and verify radiator cap function.
If leaks or contamination suspected, perform combustion leak test (block tester) to check for blown head gasket.
Inspect radiator for blockage; flush system or replace radiator if flow restricted. Replace faulty water pump/thermostat/fans as required.
Repair identified faults, bleed cooling system correctly, clear codes and perform road test to confirm issue is resolved and that B1238 does not return.
If no mechanical cause found and all sensors/wiring verify good, consider control module or intermittent sensor faults and follow manufacturer module test procedures.

⚠️ Status

Overtemperature condition detected — possible coolant system malfunction or sensor/electrical fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1–4 hours

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