P0611 code meaning
Fuel Injector Control Module Performance
Powertrain system Generic code P06xx codes Check engine light
What P0611 means
P0611 concerns systems with a separate injector control module or injector driver stage. On GM's 6.6 L Duramax LB7/LLY the injector driver unit reports a microcontroller, monitoring or converter fault or a timeout to the engine module over CAN; the code sets after 30 of 50 checks at 125 ms with battery voltage of 10–18 V, and the lamp follows after two trips. On Ford's 6.0 L Power Stroke the injector module steps battery voltage up to about 48 V; Ford's bulletin requires it to stay above 45 V during the last 10 s of the injector prime, with the battery at 11.5 V or more – weak batteries strain and damage the converter. Newer Ford diesels check an internal reference measurement (0–3300 mV, 5 s). Results are hard or no starting, rough running and low power.
P0611 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0611
- Hard or no start, especially when cold
- Rough running, misfires
- Lack of power
- Check engine light (GM after two trips)
Common causes of P0611
- Most likelyFaulty voltage converter or driver stage in the injector module (Ford 6.0 L)
- Most likelyLow battery voltage, weak batteries or poor ground
- PossibleCAN or supply line between engine and injector module disturbed
- Less likelyFaulty module software (update available)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injector control moduleBatteryEngine control module
What each part of P0611 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 11 | The exact fault in that area. |
What to do next
- Note P0611 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0611
What does P0611 mean?
P0611 means "Fuel Injector Control Module Performance". P0611 concerns systems with a separate injector control module or injector driver stage. It is a generic code, so it means the same on every make.
Is it safe to drive with P0611?
Drive gently and only to a workshop. With P0611 the car can go into limp mode (reduced power) to protect itself.
Will P0611 fail an emissions test?
Yes, it can. P0611 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0611 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0611 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.