P1316 — Injector Circuit / IDM Codes Detected — 6.0 Power Stroke

The PCM reports that the FICM has stored its own injector-circuit faults. On the 6.0L Power Stroke the FICM drives the HEUI injectors at ~48 V and flags those…

Updated October 15, 2026

What it means

Ford enhanced code. The PCM is reporting that the injector driver module (IDM; on the 6.0L this is the FICM) has stored injector circuit faults of its own. On a 6.0L this means the FICM has its own injector-circuit codes stored; read the FICM codes to find which cylinder or circuit.¹

Most likely causes

1. FICM has stored injector-circuit codes for one or more cylinders (P0261–P0284 family). The PCM flags this condition as P1316. Typical on this platform: P1316 on a 6.0L means the FICM has its own injector-circuit codes stored; read the FICM codes to find which cylinder or circuit. — The FICM monitors each injector coil and reports circuit faults to the PCM. P1316 is the flag, not the specific cylinder. Retrieve FICM codes to identify the affected cylinder(s).¹
2. Under-valve-cover harness or connector fault. Common causes are under-valve-cover harness or connector faults, an injector coil, or low FICM voltage. — The 6.0L uses under-valve-cover harnesses to reach the HEUI injectors. Chafing, oil intrusion, or loose connectors cause intermittent or hard injector-circuit faults flagged by the FICM.¹
3. Injector coil electrical fault. Common causes are under-valve-cover harness or connector faults, an injector coil, or low FICM voltage. — Per-cylinder circuit faults P0261…P0284 are detected and stored by the FICM (flagged in the PCM by P1316).¹
4. Low FICM output voltage. Common causes are under-valve-cover harness or connector faults, an injector coil, or low FICM voltage. — The FICM boosts system voltage to ~48 V to fire the injector coils. Weak batteries, a failing FICM power supply or bad grounds give low FICM voltage = hard start, rough cold idle, misfire, no start. PCM code P0611 (FICM performance); the FICM also stores its own injector-circuit codes, flagged in the PCM by P1316. A healthy FICM holds ~48 V key-on and cranking.¹
5. FICM performance degradation. On the 6.0L the FICM boosts system voltage to about 48 V to fire the HEUI injectors. P0611 usually points to low FICM output voltage — weak batteries, poor grounds, or a failing FICM power supply — check FICM voltage key-on and while cranking before replacing injectors. — A failing FICM power supply or internal fault can cause multiple injector-circuit codes to set and be reported as P1316.²

How to diagnose

1. Verify the code and retrieve FICM-specific injector codes. P1316 on a 6.0L means the FICM has its own injector-circuit codes stored; read the FICM codes to find which cylinder or circuit.
2. Check FICM supply voltage. On the 6.0L the FICM boosts system voltage to about 48 V to fire the HEUI injectors. P0611 usually points to low FICM output voltage — weak batteries, poor grounds, or a failing FICM power supply — check FICM voltage key-on and while cranking before replacing injectors.
3. Inspect battery condition, charging system, and FICM power/ground connections.
4. Inspect under-valve-cover harness and connectors for oil intrusion, chafing, or loose pins. Common causes are under-valve-cover harness or connector faults, an injector coil, or low FICM voltage.
5. If a specific cylinder code is present (e.g., P0261), check that injector circuit per FICM data. On the 6.0L injector circuits are driven and monitored by the 48 V FICM, so this code is usually stored in the FICM and flagged in the PCM by P1316. Check the under-valve-cover harness and connector, injector coil resistance and FICM voltage.

Specs and test values

Common mistake to avoid

Condemning the FICM or injectors before checking the batteries. The FICM needs good battery voltage to hold its output; weak batteries or a poor charging system can drag it below spec and look like a module failure. Source: DieselHub — 6.0 Power Stroke FICM troubleshooting.

Parts and tools you may need

• Digital multimeter
• Scan tool capable of reading FICM codes
• Basic hand tools for valve cover access

Tools you’ll need

• OBD-II scan tool — Retrieves PCM code P1316 and accesses FICM-specific injector circuit codes to identify the affected cylinder.
• digital multimeter — Measures FICM supply and 48 V output voltage key-on and while cranking to detect low voltage or power/ground issues.
• fuel injection control module tester — Reads FICM stored injector circuit faults directly to pinpoint which injector circuit is flagged by P1316.
• inspection mirror — Allows visual inspection of under-valve-cover harness and connectors for oil intrusion, chafing, or loose pins without full disassembly.

Rough cost and difficulty

Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.

When to see a pro

If multiple injector-circuit codes persist after verifying FICM voltage and harness integrity, have the FICM tested on a bench and the injectors evaluated by a diesel specialist. Do not replace injectors until FICM voltage and harness faults are ruled out.

Check for recalls

Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.

Sources