Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that a sensor that checks the temperature of the exhaust gases in your car is not working properly. It's like a thermometer for the car's exhaust, and it's saying the temperature is too low.
The EGR (Exhaust Gas Recirculation) Temperature Sensor C is reporting a lower than expected voltage, indicating a potential issue with the sensor or its circuit.
The P04D0 code is triggered when the Engine Control Module (ECM) detects a low voltage signal from the EGR Temperature Sensor C. This sensor monitors the temperature of the exhaust gases being recirculated back into the engine. A low voltage signal can indicate a fault in the sensor itself, the wiring, or the connection to the ECM.
• Check Engine Light is on
• Poor engine performance
• Increased emissions
• Faulty EGR Temperature Sensor C
• Wiring issues or poor connection in the sensor circuit
• ECM malfunction
EGR: Exhaust Gas Recirculation
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the EGR Temperature Sensor C and its wiring for damage or disconnections.
• Test the sensor with a multimeter to check for proper voltage and resistance.
• Replace the faulty EGR Temperature Sensor C.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regular maintenance checks
• Ensure proper EGR system function
• Inspect wiring for wear and tear
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid prolonged driving with the Check Engine Light on.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with EGR system issues in a variety of vehicles, often due to sensor failures or wiring problems.
Moderate – It should be addressed soon to prevent potential engine performance issues.
Driving with a malfunctioning EGR system can increase emissions and may not comply with emissions regulations.
• Engine at operating temperature
• Vehicle in idle or low-load conditions
The EGR Temperature Sensor C is typically located near the EGR valve or in the exhaust manifold.
Q: Can I drive with a P04D0 code?
A: While you can drive with this code, it's best to have it checked soon to avoid potential engine performance issues.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can reset the light with an OBD-II scanner, or it may turn off automatically after a few drive cycles if the issue is resolved.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.