P1870 :(

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Oct 23, 2013 | 03:27 PM

#11

bryanbc

Starting Member

Joined: Jan 2013

Posts: 121

From: Georgia

Quote:

Originally Posted by Captain Hook

The longer you wait, the more it's costing you in fuel!

How so. Ive had the same MPG since it started to happen

Oct 23, 2013 | 03:38 PM

#12

Captain Hook

Moderator

Joined: Mar 2009

Posts: 8,453

From: Belleville, Michigan

The purpose of overdrive is to decrease engine RPM at cruising speeds to save fuel. Depending on engine load, it usually shifts into OD around 40 MPH. When the trans is in OD, the final drive ratio is nearly 1:1 unless the torque converter is not fully locked up. P1870 is telling you that it's not fully locked up when it should be.