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Warning Lamp Circuit
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Overview
CODE | REASON | EFFECT |
Fault Code: 198 PID: 122 SPN: 1661 FMI: 4 LAMP: Maintenance SRT: |
Error detected in warning lamp circuit. Error could be an open circuit or a short circuit to the battery or ground on any lamp circuit. |
Warning lamp will not operate correctly. |
![]() Warning Lamp Circuit
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Circuit Description
The electronic control module (ECM) performs warning tests on most of its circuits and will activate a fault code if a problem is detected in one of the circuits. Certain fault codes will cause a warning lamp (yellow) to activate to signal the driver.
Component Location
The warning lamp is typically located in the truck cab on the dashboard panel.
Shop Talk
This fault typically indicates a short circuit to battery voltage. This fault can not be flashed out on the warning lamp. It can be read using INSITE™ or flashing the diagnostic code on the red lamp.
Refer to Troubleshooting Fault Code t05-198