P2ADA

Code

Generic P — Powertrain

Reductant Tank Temperature Sensor B Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 47 EN: 67 RU: 37

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Read freeze frame and live data with a diagnostic scan tool; record sensor B temperature value and compare to ambient/other sensors
Visually inspect sensor connector and harness for corrosion, damage, pulled pins, or DEF crystals
Check for continuity and shorts between sensor signal, power/reference, and ground
Backprobe sensor connector and measure signal voltage with ignition on and engine running as instructed by service manual
Measure sensor resistance at ambient temperature and compare to manufacturer specification (see service data)
If vehicle has a second (A) sensor, compare behavior and signals between A and B for consistency

Typical sensor type: NTC thermistor (resistance decreases as temperature rises) — exact resistance vs. temperature varies by manufacturer
Common ECU signal range: 0–5.0 V (sensor or voltage divider output) — normal operating signal commonly between ~0.5–4.5 V depending on temperature
Typical resistance examples (manufacturer-specific): expect measurable change with temperature (avoid absolute values without service manual); e.g., several kΩ at ambient, increasing at cold temperatures, decreasing as temperature rises
Reference voltage (if used): commonly ~5 V from ECU; ground should be near 0 V — verify with service data

Connect a scan tool. Confirm P2ADA is current or pending, record freeze-frame and live reductant tank temperature B values and compare to ambient temperature and sensor A if present.
Visually inspect sensor B connector and wiring for corrosion, DEF crystallization, broken wires, or damaged insulation. Repair or clean as needed.
With ignition ON (engine off), backprobe connector: verify reference voltage (if applicable) and ground integrity. Confirm signal wire is within expected idle voltage range per service data.
Measure sensor resistance by disconnecting sensor harness and using a multimeter. Compare resistance at ambient to manufacturer specification. To confirm behavior, gently warm or cool the sensor and verify resistance changes smoothly.
Check continuity from sensor connector to ECU connector for opens and shorts to ground or battery using an ohmmeter. Repair any wiring faults found.
If wiring and connector are good but sensor readings remain out of range, replace the temperature sensor B with a known good part and clear codes. Retest to confirm the code does not return.
If code returns after sensor replacement, suspect ECU input circuit fault. Verify ECU grounds and reference circuits. Consult manufacturer wiring diagrams and perform ECU bench-level tests or consider ECU reprogram/replace per service manual.
After repair, perform a drive cycle or required relearn procedure and verify no recurrence of the DTC.