P246E is a code that pops up when there’s a problem with the exhaust gas temperature sensor circuit-specifically, Bank 1, Sensor 4. This sensor is usually found in diesel vehicles, like Chevrolet, Ford, and GMC trucks, and it sits right before the diesel oxidation catalyst (DOC) or the diesel particulate filter (DPF). Its job is to keep tabs on the temperature of the exhaust gases and send that info to the engine’s computer. The computer uses this data to manage emissions and make sure everything’s running clean and efficient. If the sensor’s readings go out of the expected range or the circuit isn’t working right, the system throws the P246E code. While the general meaning is the same across these brands, the exact sensor location and wiring might vary a bit depending on the make and model.
DTC P246E
5879
6 minutes of readingCauses of P246E code
From what I see most often in the shop, the P246E code is usually triggered by a handful of common issues. Here’s what tends to go wrong, based on real-world cases and official repair info:
- A faulty exhaust gas temperature sensor (EGTS) in Bank 1, Sensor 4 position. This is the most frequent culprit.
- Broken, shorted, or open wiring in the sensor’s harness. Sometimes the wires get brittle or damaged from heat and vibration.
- Poor electrical connections-think corroded, bent, or loose pins at the sensor connector.
- Exhaust leaks near the sensor, which can mess with its readings.
- Excessive soot or particulate buildup on the sensor itself, especially in high-mileage diesels.
In my experience, it’s usually the sensor or the wiring, but it’s always smart to check for all these possibilities before replacing anything.
Symptoms of P246E trouble code
When this code is active, the most obvious thing you’ll notice is the check engine light coming on. Sometimes, depending on the vehicle, you might also see a warning about the emissions system or a message telling you service is needed. In most cases, you won’t feel any immediate difference in how the truck drives, but if the problem goes unchecked, the engine might eventually go into a reduced power or ‘limp’ mode to protect the emissions system. If that happens, you’ll definitely notice a drop in performance. But usually, it starts with just that warning light staring you down.
Diagnosis and testing for obd2 code P246E
Here’s how I tackle a P246E code in the shop, and you can do some of these checks yourself if you’re comfortable under the hood. First, I always start with a visual inspection. Pop the hood and find the exhaust gas temperature sensor-Bank 1, Sensor 4. Check the wiring harness for any signs of damage, like melted insulation, frayed wires, or loose connectors. Don’t forget to look for corrosion or bent pins at the connector; these little things can cause big headaches. If everything looks good, I’ll use a scan tool to read the live data from the sensor. If the readings are way off or not changing at all, that’s a big clue the sensor is bad. Next, I’ll unplug the sensor and check the resistance with a multimeter, comparing it to the specs in the service manual. If the resistance is out of range, the sensor needs replacing. If the sensor checks out, I’ll move on to checking the wiring for continuity and shorts. Sometimes, it’s worth having a helper wiggle the harness while you watch the scan tool to see if the readings jump around. And always inspect for exhaust leaks near the sensor-those can throw off the readings, too. If you see a lot of soot buildup on the sensor, that’s another thing to address.
Common mistakes when fixing dtc P246E
I’ve seen folks jump straight to replacing the sensor without checking the wiring or the connectors first. That’s a surefire way to waste money if the real problem is just a loose pin or a broken wire. Another common mistake is ignoring possible exhaust leaks or soot buildup, which can both cause false readings. Skipping the live data check with a scan tool is another big one-sometimes the sensor is working, but the computer isn’t seeing the right signal because of a wiring issue. Always work through the basics before buying parts.
How serious is a P246E
This isn’t something you want to ignore. While the truck might run fine at first, driving around with a faulty exhaust gas temperature sensor can lead to bigger problems. If the computer can’t trust the sensor, it might stop regenerating the DPF properly, which can cause the filter to clog up. That’s a serious hazard-DPF failure can lead to expensive repairs and even engine damage if things get bad enough. Plus, you risk failing emissions tests and getting stuck in limp mode at the worst possible time. My advice: don’t put this off for later. Things can go south quickly if overlooked.
Repair solutions for obd code P246E
Most of the time, the fix is pretty straightforward. Here’s what usually gets the job done:
- Replace the faulty exhaust gas temperature sensor with a new OEM part.
- Repair or replace any damaged wiring or connectors in the sensor circuit.
- Clean off any excessive soot or particulate buildup from the sensor, if it’s not too far gone.
- Fix any exhaust leaks near the sensor location.
- Clear the code with a scan tool and take the vehicle for a test drive to make sure everything’s working as it should.
It’s best to use genuine parts and follow the service manual procedures for your specific make and model.
Conclusion
To sum it up, P246E means your exhaust gas temperature sensor (Bank 1, Sensor 4) isn’t sending the right signal to the computer, usually because of a bad sensor, wiring issue, or sometimes soot buildup or an exhaust leak. This code is a warning that your emissions system isn’t being monitored properly, and ignoring it can lead to much bigger headaches down the road. I recommend starting with a careful inspection of the sensor, wiring, and connectors, and only replacing parts once you’re sure what’s wrong. Acting quickly is the best way to avoid expensive repairs and keep your truck running safely and cleanly.
