The Ford P1393 code has a different meaning than at Chevrolet/GM. At Ford, this code generally corresponds to:
Definition
P1393 – Camshaft Position (CMP) Sensor Circuit Range/Performance
This code indicates that the Powertrain Control Module (PCM) has detected an abnormal signal from the Camshaft Position (CMP) sensor.
Possible Causes
- Faulty CMP Sensor – The sensor is not providing a correct signal to the PCM.
- Wiring or Connector Issues – Damaged wires, short circuits, poor contact.
- Timing Problem – Incorrect synchronization between the camshaft and the crankshaft.
- Reluctor (Toothed Wheel) Defect – Damaged or worn teeth on the CMP sensor wheel.
- PCM Problem – Internal failure of the control module (rare).
Common Symptoms
- Hard Starting Engine (especially when cold)
- Misfires or unstable idle
- Loss of Power and reduced performance
- Malfunction Indicator Lamp (MIL) illuminated
Diagnosis and Repair
1. Check the CMP Sensor
- Resistance Test (if applicable, depending on the model).
- Visual Inspection (cracks, physical damage).
- Signal Check with an oscilloscope or diagnostic tool.
2. Inspect Wiring and Connectors
- Check the wires between the CMP sensor and the PCM.
- Look for short circuits, breaks, or corrosion.
3. Check Engine Timing
- If the timing belt has jumped or is misaligned, it can affect the CMP signal.
4. Replace the CMP Sensor if Necessary
- Some Ford models use magnetic or Hall effect CMP sensors.
5. Reset the PCM After Repair
- Clear the code and check if it returns.
Important Note
On some Ford models (such as the Focus, F-150, Escape), a faulty CMP sensor can also trigger P0340 or P0345 codes.
If the problem persists after replacing the sensor, check:
✅ The sensor’s supply voltage (usually 5V or 12V depending on the model).
✅ The condition of the camshaft’s reluctor (toothed wheel).