Powertrain, generic · Computer and auxiliary outputs

P0611 Fuel Injector Control Module Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Faulty voltage converter or driver stage in the injector module (Ford 6.0 L)
Low battery voltage, weak batteries or poor ground
CAN or supply line between engine and injector module disturbed
Faulty module software (update available)

Symptoms

  • Hard or no start, especially when cold
  • Rough running, misfires
  • Lack of power
  • Check engine light (GM after two trips)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€300–2,000
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector control modulebatteryengine control module

Related codes

P0612P062BP0201P0606P0562

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.