Injector Circuit / IDM Codes Detected
P1316 indicates that the powertrain control module (PCM) has detected a fault in the injector driver module (IDM) or the injector circuit. This code is common in Ford Power Stroke diesel engines. The IDM controls the high-voltage pulses to the fuel injectors. A fault can be caused by a failing IDM, wiring issues, or a defective injector. This can lead to misfires, rough running, and reduced power.
1. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Loss of power or hesitation under load
- Hard starting or no start
- Excessive smoke from exhaust
2. Most Common Causes
- Damaged injector harness (UVCH) or loose/burnt connectors (very common on 7.3L)
- Faulty Injector Driver Module (IDM) (internal driver failure)
- Injector(s) with internal short circuit or open circuit (coil)
- PCM-IDM communication wiring shorted to ground/battery or open
- Low battery voltage / charging issues affecting the IDM
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes to pinpoint the cylinder or circuit.
Step 2: Visually inspect IDM connectors and wiring for damage or corrosion.
Step 3: Measure injector resistance at the IDM connector (spec: 0.5-5 ohms).
Step 4: Check IDM power supply and ground circuits.
Step 5: Perform a buzz test using a scan tool to test IDM output.
Step 6: If all else fails, replace the IDM or injector as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with P1316 can cause poor performance, stalling, and potential damage to the IDM or injectors. Have it diagnosed promptly.
How much does it cost to fix?▼
Cost varies: IDM replacement $200-$600, injector replacement $300-$800 per injector, wiring repair $100-$300. Total can be $200-$800 or more depending on the root cause.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.