08/27/2026
Recent diagnostic job. Customer complaint of intermittent check engine light on his diesel pickup truck. Scanned for codes, it had a code for def pump circuit. After reading the troubleshooting information I decided to check the pumps resistance with a graphing meter, resistance was out of the specififed range and it would spike as I tapped on it. It needs a new pump, to avoid the client from potentially coming back after replacing the pump, I checked all the wiring related to the pump. It all checked out. Ordered and installed a new oem pump and the engine light hasnt come back on.