P217B code meaning
Fuel Injector Group G Supply Voltage Circuit Low
Powertrain system Generic code P21xx codes Check engine light
What P217B means
P217B reports the feed of injector group G as grounded, which on GM's direct-injection V8 engines is the injector of cylinder 7, at the rear of bank 1. GM's 2016 table 16OBDG07A and the 2018 LT4 table of the supercharged 6.2 V8 measure it with the driver switched on: if 25 A or more flows through the high side, the line is grounded somewhere. The check runs every 100 ms as soon as the battery has 11 V; 10 failures in 20 samples set the code as type A, so the MIL comes on in the same trip. Check the harness routing at the rear of the engine and the injector connector before suspecting the module. The module stops firing the injector, which shows up as a cylinder 7 misfire. P217C is the high fault, P217A the general one.
P217B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P217B
- Check engine lamp on immediately
- Cylinder 7 misfire, reduced power
Common causes of P217B
- Most likelyCylinder 7 feed wire grounded at the rear of the engine
- PossibleCylinder 7 injector shorted to ground
- Less likelyEngine control module output stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorInjector wiringEngine control module
What each part of P217B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 7B | The exact fault in that area. |
What to do next
- Note P217B 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 P217B
What does P217B mean?
P217B means "Fuel Injector Group G Supply Voltage Circuit Low". P217B reports the feed of injector group G as grounded, which on GM's direct-injection V8 engines is the injector of cylinder 7, at the rear of bank 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P217B?
Drive gently and only to a workshop. With P217B the car can go into limp mode (reduced power) to protect itself.
Will P217B fail an emissions test?
Yes, it can. P217B 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 P217B to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P217B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.