Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3871 FMI 2 (CPC) Transmission Speed Failure
NOTE: Please see the step by step troubleshooting procedures for this specific code.
NOTE: If the engine has been programmed recently, ensure the parameters for the transmission are correct.
PROBABLE CAUSES:
1. ITransmission Speed Sensor connector/harness all the way to the ECM.
2. Transmission speed sensor failure.
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