P2B2C

Code

Generic P — Powertrain

Engine Coolant Temperature Sensor 5 Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 38 EN: 36 RU: 22

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Open or short in ECT Sensor 5 wiring (signal, reference, or ground)
Corroded, loose or damaged connector at the sensor or ECM
Failed or out-of-spec ECT Sensor 5 (internal short, open, or degraded NTC element)
Poor or missing sensor ground or reference voltage
Air pocket, low coolant level, blocked coolant flow, or thermostat stuck open/closed
Short to battery voltage or chassis ground on the signal circuit

Read freeze frame and freeze data for ambient and engine conditions when the code set
Monitor live data stream for ECT Sensor 5 and compare to other temperature inputs (ambient, ECT sensors 1–4 if present)
Inspect sensor connector and wiring for corrosion, damage, pin push-out or water intrusion
Verify reference voltage (usually ~5 V) and good ground at the sensor connector with key ON, engine OFF
Measure signal voltage at the sensor connector while the engine warms; watch for sensible change as temperature rises
Perform resistance check of the sensor (with sensor removed and cold/warm) and compare to manufacturer spec or verify expected NTC behavior (resistance decreases as temp rises)

Sensor type: typically NTC (Negative Temperature Coefficient) thermistor — resistance falls as temperature rises
Reference voltage: commonly ~5.0 V (verify vehicle-specific value)
Signal voltage range: typically ~0.1–4.9 V depending on temperature (verify spec for vehicle)
Expected operating coolant temperature: roughly 70–110 °C (160–230 °F) for a warm engine — sensor signal should move smoothly during warm-up
Fault conditions: very low or very high steady signal voltage, signal stuck at one value, or rapid erratic changes indicate sensor/harness/ECM issues

Verify the code and note freeze frame conditions. Check for additional related codes (other ECT codes, PIDs, or cooling system faults).
Using a scan tool, monitor live ECT Sensor 5 PID while cold start and during warm-up. Compare its behavior to ECT sensors 1–4 (if present) and to ambient conditions.
Visually inspect the sensor and harness for damage, pin corrosion, water intrusion, bent pins or loose terminal.
With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage at the reference pin and good ground at the ground pin. Record signal voltage.
Wiggle the wiring while monitoring the live signal to reveal intermittent opens or shorts.
If wiring and connector appear OK, remove the sensor and measure its resistance at a known temperature; confirm NTC characteristic (resistance decreases with rising temp). If available, heat the sensor in water and compare resistance change to spec.
Check continuity from the sensor signal pin back to the ECM pin; check for short to battery voltage or chassis ground.
Repair any wiring/connector damage, replace the sensor if out of spec, and correct coolant level or thermostat issues if they affect sensor reading.
After repair, clear codes and perform a full warm-up and road test while monitoring the sensor reading to confirm correct operation and that the code does not return.