IDM EN Circuit Failure
The P1662 code indicates a failure in the Injector Driver Module (IDM) Enable circuit. The IDM is responsible for controlling the fuel injectors in diesel engines, and the enable circuit provides power to the IDM. A failure in this circuit can prevent the IDM from operating, leading to no-start or poor engine performance. Common causes include a faulty IDM, damaged wiring or connectors, or a blown fuse.
01. Most Common Causes
- Faulty Injector Driver Module (IDM)
- Open or shorted IDM enable circuit wiring
- Corroded or damaged connectors
- Blown fuse or relay for IDM power
02. Symptoms You Will Notice
- Engine cranks but does not start
- Engine misfires or runs rough
- Check Engine Light illuminated
- Loss of power or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes to confirm P1662.
Step 2: Inspect IDM fuse and relay; replace if blown.
Step 3: Check wiring and connectors for damage or corrosion.
Step 4: Test IDM enable circuit voltage with a multimeter.
Step 5: If circuit is intact, replace IDM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or fail to start, leading to a breakdown.
How much does it cost to fix?▼
Repair costs range from $150 to $400 depending on whether the IDM needs replacement or just wiring repair.