Injector Circuit / IDM Codes Detected
P1316 indicates that the powertrain control module (PCM) has detected a fault in the injector driver module (IDM) or injector circuit. This code is common in Ford diesel engines (e.g., Power Stroke 7.3L). The IDM controls the high-voltage pulses needed to fire the fuel injectors. A failure can cause misfires, rough running, and reduced power. The code may be set due to a faulty IDM, damaged wiring, or a failed injector.
01. Most Common Causes
- Faulty injector driver module (IDM)
- Damaged or corroded wiring/connectors to injectors
- Failed fuel injector (open or short circuit)
- Low battery voltage or charging system issue
02. 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
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect IDM and injector harness for damage or corrosion.
Step 3: Test IDM power and ground circuits with a multimeter.
Step 4: Perform injector buzz test using a diagnostic tool to identify faulty injectors.
Step 5: Check battery voltage and charging system; repair if low.
04. Commonly Affected Makes
05. 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?▼
Diagnosis typically costs $50-$150. Repair costs vary: IDM replacement $200-$600, injector replacement $300-$800 per injector, wiring repair $100-$300.