P2472 — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic #

Note: The code label and description can vary depending on the vehicle manufacturer (OEM). Below are some known label variations by OEM:

• Ford: Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic
• GM (Chevrolet/GMC): Exhaust Gas Temperature Sensor Circuit Intermittent
• Dodge/RAM: Exhaust Gas Temperature Sensor Signal Erratic
• Volkswagen/Audi: Exhaust Gas Temp Sensor Circuit Range/Performance
• Mercedes-Benz: Exhaust Gas Temperature Sensor Circuit Implausible Signal

Summary of the P2472 Code #

P2472 is a generic OBD-II diagnostic trouble code (DTC) that signals an issue with the exhaust gas temperature (EGT) sensor circuit—specifically, the signal from the sensor is intermittent or erratic. The EGT sensor measures the temperature of exhaust gases to help the engine control module (ECM) manage emissions, especially for systems with diesel particulate filters (DPF) or selective catalytic reduction (SCR). An erratic or intermittent circuit means the sensor’s electrical signal is inconsistent, which can cause the ECM to misinterpret exhaust temps. This code can lead to poor emissions control, potential engine derating, and even DPF regeneration issues. While not always critical, it’s important to address to avoid further emissions system or drivability problems.

Common Symptoms for Code P2472 #

When P2472 is present, you might notice one or more of the following symptoms. In some cases, the issue is only detected by the check engine light, but often there are performance or emissions-related effects:

• Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) illuminated
• Reduced engine performance or “limp” mode, especially on diesel vehicles
• Failed or incomplete DPF regeneration (for vehicles equipped with DPF)
• Increased visible exhaust smoke (soot)
• Poor fuel economy
• Noticeable hesitation or rough running, especially during acceleration

Probable Causes of P2472 (Ranked by Frequency) #

P2472 is most often triggered by issues with the EGT sensor or its wiring, but several other factors can be involved. Here are the most common causes, ranked from most frequent to less common:

1. Faulty exhaust gas temperature (EGT) sensor—sensor element or internal circuitry failure
2. Damaged or corroded wiring/connectors between the EGT sensor and the ECM
3. Exhaust system leaks near the sensor causing abnormal readings
4. Shorts or open circuits in the sensor harness
5. Water intrusion at connectors or in the sensor body
6. ECM (Engine Control Module) malfunction (rare, but possible)

Step-by-Step Diagnosis for Code P2472 #

Diagnosing P2472 requires a logical approach to confirm the root cause. Here’s a systematic checklist to guide you or your technician:

• 1. Confirm code and clear: Use a scan tool to verify P2472 is present. Clear the code and see if it returns after a short drive cycle.
• 2. Visual inspection: Examine the EGT sensor and wiring for damage, corrosion, or signs of exhaust leaks nearby.
• 3. Check sensor connectors: Unplug and inspect the sensor’s electrical connector for bent pins, moisture, or corrosion.
• 4. Wiggle test: With the engine running, gently move the wiring harness to see if the code or erratic readings reappear—this can reveal intermittent faults.
• 5. Measure sensor resistance: Using a multimeter, check the resistance of the EGT sensor and compare it to OEM specs (available in the repair manual).
• 6. Check for reference voltage: With key on, measure voltage at the connector to ensure the ECM is sending a proper signal.
• 7. Test with scan tool: Monitor live data readings from the EGT sensor—look for sudden jumps, dropouts, or implausible values.
• 8. Substitute known-good sensor: If available, swap in a working EGT sensor to see if the code resolves.
• 9. Inspect ECM connections: If all else checks out, inspect ECM connections or consult OEM technical bulletins for software updates.

Possible Repairs for P2472 #

Repairs for P2472 depend on which cause you find during diagnosis. Here are the most common fixes, targeted to each likely root cause:

• Replace faulty EGT sensor if it fails resistance or live data tests
• Repair or replace damaged wiring or connectors (broken, frayed, burnt, or corroded wires)
• Seal or repair exhaust leaks close to the sensor to prevent incorrect readings
• Clean or dry connectors if water or corrosion is present
• Replace or reprogram ECM only if all other possibilities are ruled out (rare)

Is It Safe to Drive with Code P2472? #

Limited—use caution. While P2472 usually won’t cause immediate breakdown, driving with this code can result in poor emissions performance and, on some diesel vehicles, can eventually trigger limp mode or prevent the DPF from regenerating. If you notice drivability issues, excessive smoke, or warning lights related to emissions, it’s best to address the issue as soon as possible to avoid further complications or potential fines for emissions non-compliance.

Vehicles Most Commonly Affected by P2472 #

This code appears most frequently on modern diesel engines, especially those with advanced emissions control systems. Vehicles with known occurrences include:

• Ford Super Duty (F-250, F-350, F-450) with Power Stroke diesel
• Chevrolet Silverado/GMC Sierra Duramax diesel
• Dodge/RAM 2500/3500 Cummins diesel
• Volkswagen/Audi TDI (diesel) models
• Mercedes-Benz Sprinter and Bluetec diesels
• Other trucks and SUVs equipped with diesel particulate filters (DPF)

Common Mistakes and Best Practices for P2472 #

Avoiding misdiagnosis or unnecessary repairs can save both time and money. Here are common pitfalls and expert tips:

• Mistaking sensor location: Some vehicles have multiple EGT sensors—always verify the correct sensor by consulting a wiring diagram or repair manual.
• Overlooking wiring/connectors: Intermittent faults are often due to wiring, not the sensor itself.
• Ignoring exhaust leaks: Even small leaks near the EGT sensor can trigger false readings.
• Skipping live data analysis: Always use a scan tool to observe real-time sensor output for erratic or implausible values.
• Parts swapping without testing: Only replace parts after confirming the root cause with proper diagnostics.

Quick FAQ for P2472 #

Got more questions? Here are rapid answers to the most common concerns:

• Q: Can a dirty or clogged DPF cause P2472?
  A: Not directly. P2472 is triggered by a circuit issue, but a malfunctioning EGT sensor can prevent the DPF from regenerating properly over time.
• Q: How much does it cost to fix P2472?
  A: Replacing an EGT sensor generally costs between $100–$350 including labor, but wiring repairs may vary depending on complexity.
• Q: Will my vehicle pass emissions with P2472?
  A: In most regions, an active check engine light or stored code like P2472 will result in an emissions test failure.