P216CFuel Injector Group E Supply Voltage Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on immediately
- Cylinder 5 misfire and rough idle
- Likely causes
- LikelyInjector 5 feed chafed against a powered circuit
- PossibleHigh-side driver in the engine control module leaking voltage
- RareMoisture or corrosion bridging pins in the injector connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.