P1298 Code: IDM Failure
⚠️ Severe · not recommended to drive
A failed injector driver module can cause a no-start or heavy misfire, so the vehicle should not be driven.
What P1298 means
The injector driver module (IDM) is the electronic box that fires the fuel injectors on diesel engines. This code means the IDM has failed or reports a fault, so one or more injectors may not fire. The engine may not start at all or may run with serious misfires.
Symptoms
- Engine cranks but will not start
- Heavy misfire or rough running
- Loss of power
- Excessive smoke from the exhaust
- Engine suddenly shuts off
Common causes
- most common: Failed injector driver module
- common: Damaged wiring harness to the injectors
- common: Low battery or weak charging system
- less common: Faulty powertrain control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Test the battery and charging system | Yes | $0–100 |
| Inspect and repair the injector wiring harness | Mechanic | $150–400 |
| Replace the injector driver module | Mechanic | $300–700 |
Frequently asked questions
Can I drive with a P1298 code?
No. A failed IDM can stop the engine from starting or cause heavy misfires, so have the truck towed for repair.
What does the IDM do?
The injector driver module sends the electrical pulses that fire each fuel injector at exactly the right moment on a diesel engine.
How much does it cost to fix P1298?
A new IDM runs about $300–$700 with labor. Wiring harness repairs add $150–$400.
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.