P1871
Undefined Gear Ratio.
- GMC
- Powertrain
- Manufacturer code
How this code is built
- P
- SystemPowertrain
- 1
- Defined byThe manufacturer
- 8
- AreaTransmission
- 71
- FaultThe specific fault in that area
Guide
Writing the guide for P1871. The first open of a code takes up to a minute.