Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the power supply to a sensor that checks how much ammonia (NH3) is in the exhaust. It's like when a toy doesn't work because the batteries are too low.
The P24EB code indicates that the voltage in the circuit supplying power to the NH3 sensor is lower than expected, which can affect the sensor's ability to function properly.
The NH3 sensor is part of the vehicle's emissions control system, specifically in vehicles equipped with Selective Catalytic Reduction (SCR) systems. This sensor measures the amount of ammonia in the exhaust gases. The power supply to this sensor must be within a specific voltage range for accurate readings. A low voltage condition can lead to incorrect sensor readings and potentially affect the vehicle's emissions control performance.
• Check Engine Light illuminated
• Possible reduction in engine performance
• Increased emissions
• Faulty NH3 sensor
• Wiring issues such as damaged wires or poor connections
• Faulty power supply or control module
NH3: Ammonia, a compound used in emissions control systems
SCR: Selective Catalytic Reduction, a system used to reduce emissions in diesel engines
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors to the NH3 sensor
• Test the voltage supply to the NH3 sensor
• Repair or replace damaged wiring
• Replace the NH3 sensor if faulty
• Check and repair the power supply or control module
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regularly inspect and maintain the vehicle's wiring
• Ensure proper maintenance of the emissions control system
• Use high-quality replacement parts
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on
• Do not ignore the issue as it may affect emissions
• Consider regular maintenance checks to prevent similar issues
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
The P24EB code has become more common with the introduction of stricter emissions standards and the use of SCR systems in diesel vehicles.
Moderate – While the vehicle may still be drivable, it is important to address the issue to ensure proper emissions control.
Ignoring emissions-related issues can lead to failing emissions tests and potential fines in regions with strict emissions regulations.
• Engine at operating temperature
• Vehicle in closed-loop operation
The NH3 sensor is typically located in the exhaust system, downstream of the SCR catalyst.
Q: Can I drive my car with a P24EB code?
A: While the car may still be drivable, it is recommended to fix the issue to avoid increased emissions and potential damage to the emissions system.
Q: How does the NH3 sensor affect my vehicle?
A: The NH3 sensor helps monitor and control the amount of ammonia in the exhaust, which is crucial for reducing emissions in vehicles with SCR systems.
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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.
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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.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.