Powertrain, generic (extended)

P2146 Fuel Injector Group A Supply Voltage Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Direct-injection and common-rail injectors are fed by a high-side driver in the engine module, often shared by several injectors. P2146 is the open or general fault of the first such supply. GM's 2009 Duramax diesel pairs injectors 1 and 4 in group 1 and sets P2146 when the driver sees an open, short or missing load for 6 ms, type A. VW's 2014 TSI and VR6 engines check the high-side current: below 2.6 A or above 14.9 A. GM petrol direct injection assigns the code to a single cylinder, the high-side control line of cylinder 1; in the Saab 9-5 2.0T a supply fault shared by cylinders 1 and 4 sets P2146 and P2155 together, after 1 s, type B, and the injector is shut off. GM bulletin PIP4924D links it to chafed V6 injector harnesses. Expect misfire and rough running.

Likely causes

Injector harness chafed through or wire open inside insulation
Loose, wet or corroded injector connector
Open coil or piezo stack in an injector of the group
Faulty high-side driver in the engine control module

Symptoms

  • Misfire on one or more cylinders
  • Rough running and loss of power
  • Check engine lamp on

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time1–5 h

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

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P2147P2148P2149P2155P0201P062D

References: gsi.ext.gm.com, saabwisonline.com, static.nhtsa.gov, static.nhtsa.gov.