What Does P1316 Mean?
P1316 indicates that the powertrain control module has detected injector circuit or Injector Driver Module (IDM) diagnostic trouble codes. This is commonly seen on Ford diesel engines where the IDM is a separate module that drives the high-pressure fuel injectors. The PCM is flagging that the IDM has logged its own internal faults.
Common Causes
30%
Failed fuel injector (open or shorted solenoid)
25%
Injector Driver Module (IDM) internal failure
25%
Damaged injector wiring harness (chafed under valve cover)
15%
Corroded IDM connector pins
5%
Poor IDM ground or power supply
Diagnostic Steps
1
Retrieve IDM-specific codes using a scanner that can communicate with the Injector Driver Module directly.
2
Perform an injector buzz test or contribution test to identify which injector(s) are not firing correctly.
3
Inspect the injector wiring harness under the valve cover(s) for chafing, oil contamination, or broken conductors.
4
Measure injector resistance on each cylinder — they should all be within specification and closely matched.
5
Check IDM power supply (battery voltage) and ground connections for voltage drop.
6
If a specific injector is identified, swap it with another cylinder's injector and verify the fault follows.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
P1316 indicates that the powertrain control module has detected injector circuit or Injector Driver Module (IDM) diagnostic trouble codes. This is commonly seen on Ford diesel engines where the IDM is a separate module that drives the high-pressure fuel injectors. The PCM is flagging that the IDM ha...
The most common cause of P1316 (Injector Circuit / IDM Codes Detected) is: Failed fuel injector (open or shorted solenoid)
Typical repair costs for P1316 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Injector circuit faults can cause rough running, loss of power, hard starting, and white/black smoke. On diesel engines, a stuck-open injector can cause hydro-lock or runaway conditions. Diagnose and repair before extended driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1316 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection / Injector Driver Module
Difficulty
Type
Manufacturer
Recommended Tools
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