Causes of dtc P2473
From experience, the most common reasons I see for a P2473 code are:
- A failed exhaust gas temperature sensor (EGTS) on bank 2, sensor 4. This is the part itself going bad.
- Wiring issues-like an open or shorted harness to the sensor. Sometimes wires get brittle, break, or rub through on something hot or sharp.
- Poor electrical connections at the sensor plug. Corrosion, bent pins, or loose terminals can all cause trouble.
- Exhaust leaks near the sensor. If hot gases escape before reaching the sensor, it can throw off the readings.
- Excessive soot or particulate buildup on the sensor tip. This can insulate the sensor and make it read incorrectly.
Most often, it’s a bad sensor or a wiring issue, but I’ve seen all of these pop up in the shop.
Symptoms of P2473 engine code
When this code is active, the main thing you’ll notice is the check engine light coming on. Sometimes, you might also see a warning for emissions or a service engine soon message. In most cases, you probably won’t feel a big change in how the truck drives right away, but if the problem goes on too long, it can lead to issues with the emissions system-like problems with the DPF regenerating or even reduced engine power if the computer decides things are getting risky. If you notice any odd smells, excessive smoke, or a drop in fuel economy, those could also be related.
Diagnosis steps for P2473 trouble code
Here’s how I usually tackle a P2473 code in the shop:
- First, I recommend starting with a visual inspection. Pop the hood and look at the wiring going to the exhaust gas temperature sensor (bank 2, sensor 4). Check for any obvious damage-melted wires, broken insulation, or loose connectors. Don’t forget to look for corrosion or bent pins inside the plug.
- Next, gently tug on the wires to see if any are loose or about to break. Sometimes, a wire can look fine but be broken inside the insulation.
- If everything looks good, I use a scan tool to check the live data from the sensor. If the temperature reading is way off compared to the other sensors, or stuck at a high or low value, that’s a big clue.
- After that, I’ll unplug the sensor and check the resistance with a multimeter. Compare it to the specs in the service manual. If it’s out of range, the sensor is likely bad.
- If the sensor checks out, I move on to the wiring. I’ll check for continuity from the sensor plug back to the engine computer, making sure there are no breaks or shorts.
- Finally, I inspect the exhaust near the sensor for leaks or heavy soot buildup. If there’s a leak, you’ll need to fix that first.
It’s better to have someone assist you if you’re not comfortable with electrical checks, but these steps cover the basics.
Common Mistakes when fixing P2473
I’ve seen a few common pitfalls with this code. One is replacing the sensor right away without checking the wiring or connector-sometimes the problem is just a loose or corroded plug. Another is ignoring possible exhaust leaks, which can mess with sensor readings. And don’t forget to check for soot buildup on the sensor tip; I’ve seen folks miss that and end up replacing a good sensor. Skipping the resistance check with a multimeter is another big one-always verify before buying parts.
How serious is obd2 code P2473
This isn’t something you want to ignore. While you might not notice immediate drivability issues, letting it go can cause bigger problems down the line. The emissions system relies on accurate temperature readings to keep things running clean and safe. If the sensor isn’t working, you risk damaging the DPF or DOC, which are expensive parts. In some cases, the engine computer might limit power to protect the system, leaving you stranded or in limp mode. Honestly, it’s dangerous to ignore this-things can go south quickly if overlooked.
Repair solutions for obd code P2473
The most reliable fixes I’ve seen for P2473 are:
- Replacing the faulty exhaust gas temperature sensor (bank 2, sensor 4) if it’s out of spec.
- Repairing or replacing damaged wiring or connectors going to the sensor.
- Cleaning the sensor tip if it’s covered in soot-sometimes that’s all it takes.
- Fixing any exhaust leaks near the sensor so it gets an accurate reading.
- Clearing the code and verifying the repair with a scan tool to make sure the sensor is reading correctly and the code doesn’t come back.
In cases like this, it’s usually the sensor or wiring, but don’t skip the basics.
Conclusion
To sum it up, P2473 means your vehicle’s exhaust gas temperature sensor circuit (bank 2, sensor 4) isn’t working right. This sensor is crucial for keeping your emissions system healthy and your engine running efficiently. Don’t put this off-if you ignore it, you could end up with costly damage to the DPF or DOC, or even stuck in limp mode. The best approach is to start with a careful inspection of the wiring and sensor, check for exhaust leaks or soot, and only replace parts after confirming what’s wrong. That’s the surefire way to get back on the road safely and avoid bigger headaches down the line.
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