P2DB1

Code

Generic P — Powertrain

Drive Motor A Temperature Sensor C Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 34 RU: 20

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Causes

Open or shorted sensor wiring (broken conductor, chafing, pinched harness)
Poor/ corroded/loose connector at the sensor or controller
Failed temperature sensor (thermistor)
Short to battery voltage or ground in the sensor circuit
Faulty motor controller input or internal wiring/PCB fault
Intermittent connection due to vibration or moisture intrusion

Symptoms

DTC P2DB1 present and may be stored with freeze frame data
Possible reduced power or limp mode behavior from drive system (depending on vehicle logic)
Drive motor temperature readout erratic, out-of-range, or unavailable on dash/telemetry
Intermittent fault lamp or multiple motor-related codes if circuit condition varies

What to check

Read stored/active DTCs and freeze-frame data with a capable scan tool
Inspect sensor connector and wiring harness for damage, corrosion, or water ingress
Verify proper high-voltage safety procedures before working near traction components
Check for related drive motor codes that could indicate controller faults
Monitor live temperature sensor data while wiggling harness to reproduce intermittent faults
Measure voltage at the sensor connector with ignition in ON (do not start) using insulated meter if near high-voltage components

Signal parameters

Expected sensor type: thermistor (NTC or PTC) — resistance changes with temperature (decreases with increasing temp for NTC)
Typical signal circuit: pulse/return or voltage divider — expected voltage range roughly 0.1–4.9 V depending on temperature and vehicle design
Typical cold/hot resistance varies by sensor design (commonly ~2–20 kΩ at 25 °C); consult vehicle-specific data before replacing
Signal behavior to expect: smooth monotonic change with temperature, no sudden jumps or fixed open/short voltages

Diagnostic algorithm

Safety first — follow vehicle manufacturer high-voltage and workshop safety procedures for traction components.
Retrieve freeze-frame and all related DTCs; record symptoms and conditions when code set (temp, battery voltage, driving state).
Visually inspect Sensor C connector, wiring, harness routing from motor to controller for damage, abrasion, pin corrosion, or water entry; repair as needed.
With ignition ON (no start) or per service manual, backprobe sensor connector and record voltage/signal while monitoring live data on scan tool; compare to expected behavior.
Measure sensor resistance with connector disconnected (motor at ambient temperature). Compare measured resistance to expected value from service data or known thermistor curves. Heat or cool sensor to verify resistance changes smoothly.
Check for shorts: measure continuity to ground and to battery voltage from the sensor signal pin (should not be direct short).
Perform wiggle test on harness while monitoring live data to identify intermittent connector or wiring issues.
If wiring and connector are good but signal is incorrect or no change with temperature, replace the temperature sensor. Retest after replacement.
If replaced sensor still does not produce valid signal, test/inspect controller input circuits and associated fuses/relays; consider controller bench diagnostics or replacement per manufacturer guidance.
Clear codes and perform drive/operate verification to confirm repair; recheck for recurrence and any related codes.