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P2041 is a diagnostic trouble code (DTC) for "Reductant Injector Air Press Sensor Circuit Intermittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Found in both diesel and gasoline engines, the reductant injector helps reduce the noxious fumes expelled through the particulate filter in a diesel engine and the catalytic converter in gasoline fueled engines. When a malfunction is detected in the reductant injector air pressure sensor circuit by the Powertrain Control Module (PCM), a P2041 trouble code is stored.
Related trouble codes:
A P2041 trouble code means that the PCM has received a variation in the system voltage from the reductant injector air pressure sensor that exceeds manufacturer's limitations. For some vehicle models, multiple drive cycles are needed before the Check Engine light illuminates.
Causes of a P2041 trouble code include:
Loose, broken, corroded, or other damage to wiring connectors and other components
Faulty reductant injector air pressure sensor
Severe exhaust leak upstream in the system from the exhaust temperature sensor
Decrease in back pressure caused by the installation of an aftermarket off road exhaust system
The only symptom of a P2041 trouble code is excessive black smoke upon acceleration. Other than this, the only other signs of a P2041 trouble code is the lit Check Engine light and the stored trouble code.
To successfully diagnose a P2041 trouble code, the mechanic needs an advanced scanner or code reader, a digital volt/ohmmeter, a heat gun, and an infrared thermometer with a laser pointer. In addition to the proper equipment, a mechanic needs to perform the following:
Mechanics most often mistake the oxygen sensor for the exhaust gas temperature sensor. Replacing the oxygen sensor does not fix the problem with the trouble code soon returning.
Other than excessive black smoke from the exhaust pipe, a vehicle owner does not have to worry about any serious issues from the storage of a P2041 trouble code.
Repairing a P2041 trouble code can include:
If the vehicle owner has installed a high-performance exhaust system on the vehicle, the lack of back pressure, due to no catalytic converter, can cause the storage of a P2041 trouble code. To fix this problem, the mechanic can install an inline resistor, of at least 2.5 ohms, between the signal and ground wires. In addition, the mechanic should leave the exhaust gas temperature sensor disconnected. This causes the PCM to read the sensor resistance and pass it without storing a trouble code. Before removing any emission related components, the mechanic should check any local, state, or federal laws concerning this type of modification.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.