Code
P1545
MITSUBISHI
P — Powertrain
DOR tampering monitor (C)
Views:
UK: 24
EN: 28
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in DOR sensor/tamper-monitor wiring (connector damage, corrosion, chafing)
- Failed DOR (door/tamper) sensor or switch
- Poor ground or supply voltage to the sensor circuit
- Faulty body/BCM or engine control module that monitors the DOR circuit
- Aftermarket alarm, remote start or immobilizer device interfering with circuit
- Water intrusion or physical damage to door/lock/handle components
Symptoms
- Malfunction Indicator Lamp (MIL) or warning light illuminated
- Door/lock/unlock functions unpredictable or inoperative
- Vehicle may fail immobilizer check or have starting problems
- Interior/door ajar warning behaves intermittently
- Alarm triggers unexpectedly or fails to arm/disarm correctly
What to check
- Read freeze-frame and full DTC list with a capable scanner; note related body or immobilizer codes
- Visually inspect door harnesses, connectors and sensor/switch for corrosion, damage or water ingress
- Check battery voltage and ground integrity before detailed tests
- Verify whether any aftermarket alarm/remote start devices are connected to door circuits
- Wiggle-test harness while monitoring live data or DTC status for intermittent faults
- Backprobe sensor connector and check reference, signal and ground voltages with key on/doors operated
Signal parameters
- Reference/supply voltage: typically near vehicle battery voltage (12V) or 5V reference depending on sensor type
- Signal voltage: expected to change between defined states (e.g., ~0V to ~5V or open/closed switch to ground/battery)
- Continuity: closed switch ~0–2 ohms, open switch = infinite; harness should have low resistance to ground where applicable
- CAN/communication: check for loss of messages on body network when tamper event logged
Diagnostic algorithm
- Verify battery voltage and good chassis/engine grounds. Low voltage can cause spurious faults.
- Scan with manufacturer-capable tool. Record P1545 plus any related codes and live data for the DOR input channel.
- Inspect the door(s), door lock actuators, door handle, and associated wiring for visible damage or water ingress.
- Locate the DOR sensor/switch connector (door or BCM area). Disconnect, inspect pins for corrosion/heat damage and re-seat.
- With connector disconnected, measure continuity and resistance of the sensor/switch according to its expected open/closed state. Check reference and ground presence with connector connected and key ON.
- Backprobe the sensor harness while operating the door to confirm signal changes. Wiggle wiring to reproduce intermittent faults and monitor for code set.
- If signal/wiring tests pass, check for aftermarket modules tied into door circuits. Temporarily disable or remove them and retest.
- If wiring and sensors are good but fault persists, consult vehicle wiring diagrams and test continuity back to BCM/ECU. Substitute known-good BCM or sensor only when supported by diagnostic procedure.
- Clear codes and perform functional/drive cycle to confirm repair. Monitor for recurrence and record conditions that set the code.
Likely causes
- Corroded or loose connector at the DOR sensor or BCM
- Short to ground or short to battery in the sensor harness
- Failed DOR sensor/switch (stuck or intermittent)
- Recent installation of aftermarket alarm/remote start tapping into door circuits
- Faulty BCM/ECU input circuit (less common)
Fault status
Status
Control module detected an abnormal condition or tampering event on the DOR monitor channel C. Service required to inspect DOR sensor circuit, wiring and related control unit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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