Powertrain, generic (extended)

P216C Fuel Injector Group E Supply Voltage Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P216C is the opposite fault of group E: the feed of the cylinder 5 injector carries voltage when it should not. GM tests it while the high-side driver is switched off; if 1 V or less remains between the signal and the controller supply, the line is treated as shorted to power. Its 2016 3.6 LGX V6 and 2018 6.2 LT4 V8 tables need at least 11 V and count 10 failures out of 20 samples at 100 ms, type A with the MIL on the first trip. Typical sources are a chafed wire touching another powered circuit or an injector winding contacting a live conductor; GM's PI0631H lists this code with dozens of others for the Impala harness that wears on the transmission. Because the injector may stay energised, the module cuts it off and cylinder 5 drops out. P216B is the short to ground.

Likely causes

Injector 5 feed chafed against a powered circuit
High-side driver in the engine control module leaking voltage
Moisture or corrosion bridging pins in the injector connector

Symptoms

  • Check engine lamp on immediately
  • Cylinder 5 misfire and rough idle

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,000
Time0.8–5 h

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

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P216AP216BP216FP0274P0305P2148

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