Code
P1380
Other
P — Powertrain
Misfire Detected - Rough Road Data Not Available
Views:
UK: 38
EN: 41
RU: 43
AI status
Completed
Completed
100%
Causes
- Actual engine misfire (ignition, fuel, or mechanical problem)
- Faulty or missing rough-road sensor/accelerometer input
- Faulty wheel speed or suspension sensors used for rough-road detection
- Intermittent or open/shorted wiring or poor connector grounds to sensors or PCM
- Faulty crankshaft or camshaft position sensors (affects misfire detection)
- PCM software or hardware fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Engine runs rough, especially at idle or under load
- Stumble, hesitation, or noticeable misfire
- Degraded fuel economy and increased emissions
- Misfire code(s) (P03xx) may be present in addition to P1380
What to check
- Read and record all stored, pending and freeze-frame DTCs with a capable scan tool
- Confirm whether the DTC is current or historical and note conditions when it set
- Monitor live data: misfire counts, crank/cam sensor signals, vehicle speed, accelerometer/rough-road data (if available)
- Inspect wiring and connectors for the rough-road/accelerometer, wheel speed sensors, crank/cam sensors and PCM grounds
- Check battery voltage and charging system health during cranking and running
- Perform primary ignition and injector checks (coil resistance, spark presence, injector pulse)
Signal parameters
- Misfire counts (per-cylinder, if available) and misfire detection status
- Crankshaft position sensor waveform and RPM
- Camshaft position sensor signal (if used for misfire correlation)
- Accelerometer/rough-road sensor raw output or status flag (if equipped)
- Wheel speed sensor signals/vehicle speed
- Ignition coil primary/secondary waveform and injector pulse width
Diagnostic algorithm
- Connect a scan tool and read all codes and freeze-frame data. Note whether P1380 is confirmed or pending and any related P03xx or sensor faults.
- Check basic power/ground: test battery voltage, charging, and key PCM ground connections.
- With the scanner, observe live data while trying to reproduce the symptom: watch misfire counts, crank/cam signals and the rough-road/accelerometer data stream or flag. Record any missing or erratic signals.
- Visually inspect connectors and wiring for the rough-road/accelerometer and wheel speed sensors. Repair any damaged wiring or poor connections.
- If the vehicle uses an accelerometer or rough-road module, verify its presence and plug-in status. Replace or bench-test the sensor per manufacturer procedure if inoperative.
- Diagnose any accompanying misfire codes: check ignition components (swap coils or spark plugs between cylinders to see if misfire follows), test injectors, and check fuel pressure.
- Verify crankshaft and camshaft position sensors and their signal integrity with an oscilloscope or lab-grade scan tool. Repair or replace as needed.
- After repairs, clear all codes and perform drive cycles under the same conditions to confirm P1380 and any misfire codes do not return.
- If no wiring/sensor/component fault is found and symptoms persist, consider PCM reflash or replacement per manufacturer guidance.
Likely causes
- Loose, corroded or disconnected sensor connector for body/accelerometer or wheel speed sensors
- Failed accelerometer or rough-road module (if equipped)
- Failed ignition coil(s), spark plug(s) or fuel injector(s) causing real misfire
- Bad crankshaft position sensor signal causing misfire detection errors
- Low battery/charging system voltage or poor PCM ground affecting sensor signals
Fault status
Status
Misfire detected but rough-road or accelerometer data not available or invalid. Misfire monitor could not verify rough-road conditions.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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