Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
2Original wording in English
CHEVROLET, GMC
SUBJECT REGARDING DIAGNOSTIC TROUBLE CODE P1871 ON VEHICLES EQUIPPED WITH A 8.1-LITER GAS ENGINES AND THE ALLISON LCT1000 TRANSMISSION. IT HAS BEEN FOUND THAT THIS CODE EXISTS ON UNITS WITH LOW BATTERY VOLTAGE DURING ENGINE CRANKING DUE TO A LOW STATE OF CHARGE IN THE BATTERY. *TT
AM GENERAL
SOME VIN Z VEHICLES WITH VIN 185138 AND BELOW AND WITH TRANSFER CASES BUILT BEFORE MAY 7, 1999 MAY EXHIBIT A TRANSMISSION DEFAULT TO SECOND GEAR, ERRATIC SHIFTING, FAILURE OF THE SPEEDOMETER AND DIAGNOSTIC TROUBLE CODE P1871. *TT
Check vehicle applicability
6A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Transmission Mechanical Transfer Case 4×4 Switch Circuit Short To Battery
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.