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.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1D98Incorrect Gear Ratio Clutch B or D DefectiveP1D98Incorrect Gear Ratio Clutch B or D DefectiveP1D98Incorrect Gear Ratio Clutch B or D Defective (2015 BU only)P1D98Incorrect Gear Ratio Clutch B or D Defective(2015 BU Only)View all · Manufacturer wording →
Manufacturer communications
19Original wording in English
FIAT, JEEP
Reported code forms P1D98
Flash: Transmission Diagnostic and Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp…
FIAT, JEEP
Reported code forms P1D98
Flash: Transmission Diagnostic And Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a…
JEEP
Reported code forms P1D98
Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a…
JEEP
Reported code forms P1D98
Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a…
FIAT
Reported code forms P1D98
Flash: Diagnostic And System Improvements This bulletin involves updating the Body Control Module (BCM), Powertrain Control Module (PCM), Transmission Control Module (TCM) with the latest available software. All three…
FIAT
Reported code forms P1D98
Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a…
Check vehicle applicability
6A 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.
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.