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fault code P113712
fault code P113712 stands for Engine Oil Thermostat Valve Circuit Short to Battery. [1] This code points directly to an electrical issue with the oil thermostat control solenoid/valve. The suffix -12 indicates that the Engine Control Module (ECM) is detecting higher-than-expected voltage (a short circuit) on that control wire. [1, 2] When this solenoid short-circuits or loses connection, it drops the ECM into a protective fault mode. If it completely grounds out or draws too much power, it can even trip the engine circuit fuses, directly explaining your "Check Ign Fuse" message. ------------------------------ ## 📍 Where is it located? The oil thermostat control solenoid is mounted right next to or directly behind your oil filter housing assembly on the side of the engine block. There are actually two valves located in that area: [1, 2] 1. The Upper Valve: This is a longer solenoid plug located near the top of the housing area. 2. The Lower Valve: This is a shorter valve that is usually easier to see looking from underneath the truck. [1] Note: The code P113712 specifically flags the circuit for the Oil Thermostat Valve. [3, 4] ------------------------------ ## 🛠️ Troubleshooting & Fix Steps Since you are hunting an electrical issue that is affecting your dash warnings, use this progression to find the source: ## 1. Inspect the Wiring Harness (Most Likely Culprit) Because of where these valves are located, they are constantly exposed to high heat, engine vibrations, and oil. * * Unplug the connector to the oil thermostat valve. [1] * Carefully look at the wires leading into the plug. It is incredibly common on 2015–2016 models for the protective loom to rub through, causing the bare copper wires to rub against each other or short against the engine block. [5, 6] * Check for oil pooling inside the plastic connector plug itself. If oil has breached the solenoid body and filled the plug, it will bridge the pins and create a short circuit. [7] * ## 2. Test the Solenoid Resistance To confirm if the valve itself is shorted out internally: * * Grab a digital multimeter and set it to Ohms (Ω). * Probe the two pins directly on the solenoid/valve body (with the harness unplugged). * If your meter reads 0 Ohms or shows total continuity, the internal coil winding has melted together and short-circuited. The valve must be replaced. [1, 6] * ## 3. Re-Check the EMS / Engine Fuses Once a component shorts to the battery or ground, it will pop a fuse to protect the ECM. Check the engine-compartment fuses labeled EMS or Engine Management again. If you find a blown one, it will stay blown until you either fix the chafed wire or replace the shorted oil valve.