Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1870 Description

Transmission is in 4th gear with Torque Converter Clutch (TCC) engaged and the Engine Control Moduel (ECM) has detected excessive slippage when comparing the input shaft speed to the output shaft speed

P1870 Information for specific makes

P1870 BUICK
P1870 CADILLAC
P1870 HONDA
P1870 CHEVROLET
P1870 GMC
P1870 ISUZU