Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that helps reduce pollution. It's like a valve that isn't working right, and it's not getting enough power to do its job.
The P2054 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the circuit controlling the reductant injection valve for Bank 1, Unit 2.
The reductant injection valve is part of the Selective Catalytic Reduction (SCR) system, which reduces nitrogen oxide emissions in diesel engines. This code suggests that the electrical circuit for the injection valve on Bank 1, Unit 2 is not receiving enough voltage, which could be due to wiring issues, a faulty valve, or a problem with the PCM.
• Check Engine Light illuminated
• Reduced engine performance
• Increased emissions
• Faulty reductant injection valve
• Wiring issues such as shorts or open circuits
• Faulty PCM (Powertrain Control Module)
PCM: Powertrain Control Module
SCR: Selective Catalytic Reduction
DEF: Diesel Exhaust Fluid
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the reductant injection valve for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the reductant injection valve if faulty.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regular maintenance of the SCR system
• Ensure quality DEF (Diesel Exhaust Fluid) is used
• Regular inspection of wiring and connectors
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regularly maintain the vehicle to prevent future issues.
Check with the vehicle manufacturer for specific warranty coverage related to emissions components.
This code has become more common with the increased use of SCR systems in diesel vehicles to meet emissions standards.
Moderate – While the vehicle may still operate, emissions are increased and performance may be affected.
Operating a vehicle with increased emissions may violate environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop operation
The reductant injection valve is typically located near the SCR catalyst, often under the vehicle or near the exhaust system.
Q: Can I drive with the P2054 code?
A: While you may be able to drive, it's not recommended as it can increase emissions and affect performance.
Q: Will the Check Engine Light turn off by itself?
A: The light may turn off if the issue resolves itself, but it's best to address the problem to prevent further issues.
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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.