P2473 — Exhaust Gas Temperature Sensor Circuit #

Note: The code label may vary depending on the vehicle manufacturer.

• Exhaust Gas Temperature Sensor Circuit (Generic/OEM)
• EGT Sensor Circuit (Ford, GM, Toyota, Volkswagen)
• Exhaust Gas Temp Sensor Circuit Bank 1 Sensor 4 (Mercedes-Benz)
• EGT Sensor 4 Circuit Malfunction (BMW)

Summary of DTC P2473 #

The P2473 trouble code is triggered when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an issue with the exhaust gas temperature (EGT) sensor circuit. The EGT sensor is responsible for measuring the temperature of the exhaust gases, providing critical data used for emissions control and turbocharger protection. This sensor’s data helps regulate the diesel particulate filter (DPF) and protect engine components against excessive heat. When the circuit is interrupted, shorted, or reads outside the expected range, the ECM logs P2473. Depending on the OEM, the sensor referenced may vary in position along the exhaust path.

Common Symptoms for Code P2473 #

If your vehicle has set a P2473 code, you may notice changes in drivability or performance. Often, the symptoms are subtle at first but can worsen if the issue is ignored. Here’s what you might experience:

• Illuminated Check Engine Light or Malfunction Indicator Lamp (MIL)
• Reduced engine power or “limp” mode activation
• Poor acceleration or sluggishness
• Increased fuel consumption
• Excessive exhaust smoke (especially on diesel vehicles)
• DPF regeneration problems or warning messages

Probable Causes for Code P2473 #

The root causes for a P2473 code typically involve electrical or sensor faults. Based on frequency, here are the most common culprits:

1. Faulty EGT sensor (damaged, worn, or internally shorted)
2. Open or shorted wiring in the EGT sensor circuit
3. Corroded or loose connectors at the sensor or harness
4. Sensor contamination (soot, oil, or debris buildup)
5. Failed PCM/ECM (rare, usually after all other causes are ruled out)

Step-by-Step Diagnosis for Code P2473 #

A systematic approach is vital for accurate diagnosis. Here’s how an experienced technician would tackle P2473:

1. Scan for codes and freeze frame data. Note any related DTCs.
2. Visually inspect the EGT sensor and wiring for obvious damage or disconnection.
3. Check connectors for corrosion, bent pins, or poor contact.
4. Test EGT sensor resistance with a digital multimeter (refer to OEM specs).
5. Back-probe the harness to check for open or short circuits.
6. Monitor live data from the EGT sensor using a scan tool—look for abnormal readings.
7. Check sensor reference voltage and ground integrity.
8. Replace the EGT sensor if all wiring/power/ground tests pass and the sensor is out of spec.
9. Clear codes and perform a test drive to confirm repair.

Possible Repairs for Code P2473 #

Repairs for a P2473 code are usually straightforward, yet precision is key. The following remedies align with the most common causes:

• Replace the faulty EGT sensor
• Repair or replace damaged wiring in the EGT circuit
• Clean and secure sensor connectors
• Remove debris or soot from sensor tip (if accessible and recommended by OEM)
• Replace PCM/ECM (only if all other repairs fail and module failure is confirmed)

Is It Safe to Drive with Code P2473? #

Driving with a P2473 code is not recommended for extended periods. While the vehicle may operate seemingly normal at first, incorrect exhaust temperature readings can lead to DPF regeneration issues and risk of turbo/engine damage due to overheating. If the vehicle enters limp mode, power will be limited to protect components. Address the issue promptly to avoid costly repairs.

Vehicles Most Commonly Affected by Code P2473 #

P2473 is most frequently found on modern diesel vehicles, though some gasoline engines use EGT sensors as well. The following makes and models are commonly affected:

• Ford F-Series (especially Super Duty diesels)
• Chevrolet Silverado/GMC Sierra Duramax diesels
• Dodge Ram Cummins diesels
• Mercedes-Benz Sprinter vans
• Volkswagen TDI models
• BMW diesels (X5, 3 Series, etc.)
• Toyota Land Cruiser diesels (in certain markets)

Common Mistakes & Best Practices for P2473 #

Overlooking simple issues or misdiagnosing complex ones can lead to unnecessary repairs. Stay sharp with these tips:

• Don’t replace the EGT sensor until you’ve checked wiring and connectors.
• Always use OEM-quality sensors for replacement—cheap aftermarket sensors may not perform correctly.
• Reset the code and verify repair with a test drive; don’t assume the problem is fixed until confirmed.
• Refer to OEM service information for sensor specifications and wiring diagrams.
• Avoid cleaning sensitive EGT sensors unless specifically advised by manufacturer procedures.

Quick FAQ: P2473 #

Here are answers to the most common questions about P2473:

• Q: Can a faulty EGT sensor cause my car to go into limp mode?
  A: Yes, many vehicles will limit engine power to prevent overheating or DPF damage when accurate exhaust temperature data is missing.
• Q: Is it okay to install a used EGT sensor?
  A: Used sensors are not recommended. EGT sensors degrade with heat cycles; always install a new, OEM-quality part for reliability.