Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

P0851

Ignition voltage is between 9-18 volts.
No TCM DTC P0601, P0602, P0603, or P0604.
No IMS DTC P1825 or P1915.
No Communication DTC U0073, U0100, U0121, or U0140.

P0852

Ignition voltage is between 9-18 volts.
No TCM DTC P0601, P0602, P0603, or P0604.
No IMS DTC P1825 or P1915.
No Communication DTC U0073, U0100, U0121, or U0140.
No TP DTC P0121, P0122, or P0123.
No OSS DTC P0722 or P0723.
No MAF DTC P0101, P0102, or P0103.
No MAP DTC P0106, P0107, or P0108.
Engine speed is greater than 400 RPM.