I have a 1996 gmc 6.5 turbo diesel and the code p0238 keeps coming up on my code reader what is this problem and how do i fix it

SOURCE: gmc 2500 gmc turbo diesel 4x4

Check all electric connections going to transmission as (od) is electrically activated. check the conections and entire wire path for damage. OD can be disengaged by slowing speed or slight tap of brake pedal so check disengage switch and wires on brake pedal. I hope this is helpful, please rate me

SOURCE: 1998 GMC 4.3 TWO WHEEL DRIVE I KEEP GRTTING THIS CODE

evap emission is a problem with your chacoal canister in fender well or hoses goin to it or maybe purge solenoid,look at your under hood schematic to see these items

SOURCE: I have a 1996 GMC truck with a 6.5 turbo diesel

check connections at starter,alternator and battery if good have battery tested may not be holding charge,alt may not operating correctly,and starter solenoid may be going

SOURCE: 2001 gmc 6.6 diesel 2500hd,the problem wont rev

safety[ limp] mode truck wont go over 2000 rmp but it will get u safely off road or to a service station or home ur getting some kind of code thats effecting ur truck --use a different reader urs might not be able to retrieve the problem code but can reset the computer-some auto stores such as auto zone / advanced auto scan for free check shops in ur local area

SOURCE: how much do i have to pay for an engine rebuild on a gmc diesel

lookin at around 3000 to 5000