What Does P2470 Mean?
The exhaust gas temperature (EGT) sensor 4 on bank 1 is reporting a voltage signal lower than the minimum threshold expected by the PCM. This typically indicates a short to ground in the sensor circuit or a failed sensor reading artificially low temperatures.
Common Causes
35%
Damaged or shorted EGT sensor 4 internal element
30%
Wiring harness short to ground or damaged insulation
20%
Corroded or damaged connector terminals causing short circuit
10%
PCM internal fault in EGT sensor circuit driver
5%
Water intrusion or contamination in sensor connector
Diagnostic Steps
1
Step 1: Visually inspect EGT sensor 4 wiring and connector for damage, corrosion, or melted insulation near exhaust components
2
Step 2: Disconnect EGT sensor 4 and measure resistance; compare to specifications (typically 20-200 ohms at room temperature)
3
Step 3: Check continuity between sensor signal wire and ground with sensor disconnected; should show infinite resistance
4
Step 4: Backprobe sensor connector with ignition on and measure voltage supply (typically 5V reference)
5
Step 5: If all circuits test normal, replace EGT sensor 4 and retest; if problem persists, test PCM
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The exhaust gas temperature (EGT) sensor 4 on bank 1 is reporting a voltage signal lower than the minimum threshold expected by the PCM. This typically indicates a short to ground in the sensor circuit or a failed sensor reading artificially low temperatures.
The most common cause of P2470 (Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 4) is: Damaged or shorted EGT sensor 4 internal element
Typical repair costs for P2470 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may enter reduced power mode. Diesel particulate filter regeneration may be affected, potentially causing long-term engine damage if ignored.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2470 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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