P1316high severityPowertrain
Injector Circuit / IDM Codes Detected
on 2002 Ford Excursion 7.3L V8 Power Stroke Diesel · 4WD
What this code means
The PCM has detected fault codes from the Injector Driver Module (IDM). This is a common code on the Ford 7.3L Power Stroke diesel. The IDM operates injectors in two banks — a fault can shut down one bank, effectively making the engine run on only 4 cylinders.
Symptoms
- Check Engine Light
- Rough idle
- Engine misfires
- Loss of power
- Excessive smoke
- Engine may run on 4 cylinders only
- Stalling
Common causes
- Faulty Injector Driver Module relay
- Loose Under Valve Cover (UVC) wiring harness connector
- Failed IDM
- Faulty fuel injector
- Damaged wiring between PCM and IDM
- Low battery voltage
Diagnostic steps
- Check for companion injector-specific codes (P0261-P0296)
- Inspect UVC harness connectors for looseness (very common cause)
- Test IDM relay
- Check IDM power and ground circuits
- Test individual injector resistance
- Check battery voltage and charging system
Repair notes
Check UVC harness connectors first — most common fix on 7.3L. Test IDM relay. Replace IDM if confirmed faulty.
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Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1