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Showing results for tags 'p0121'.
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Had all 5 of these codes pop up at once after changing all of my better connections while trying to figure out my electrical issues. I’ve been dealing with a p0121 off and on for 3-4 months, replaced my APPS, dead pedal came back 3 wks later. Coincidentally my trans (auto) started not going into gear in drive or reverse until I rev up to about 1k rpm’s. I did the BD diesel noise isolator and for a few days it drove perfectly with zero shifting issues or dead pedal. Then started having overboost codes and then the truck randomly died twice. Replaced batteries and redid connections and triple checked the connections, and now I have those 5 codes. Thinking ECM going out due to alternator? Thoughts? And how would I test my ecm to find out? -
My truck (2000 2500 automatic w/103K) has a bad case of dead pedal.I went by Autozone and had them read the codes and the only one was overboost.I cleared it and none have returned.It also has a fairly new fass ddrp lift pump on it.Once in a while it wil take off like normal for 2 or 3 presses of the accelerator; then just return to the same old dead pedal.Can the APPS be checked with a digital volt meter?Any other ideas? probably VP44?thanks in advance.joek
