What is OBD-II Code P2059 – Reductant Injection Air Pump Control Circuit/Open
As a mechanic, I understand how important it is to know what OBD-II codes mean for a car’s overall health. Today, I want to dive deep into OBD-II Code P2059, and explain what it means for your car’s Reductant Injection Air Pump Control Circuit/Open and how to repair it.
What is OBD-II Code P2059?
OBD-II Code P2059 indicates that there is a problem with the reductant injection air pump control circuit. The code usually appears on vehicles with diesel engines that have exhaust after-treatment systems. The reductant injection air pump is an important component that helps control the temperature of the exhaust, and by doing that, it reduces air pollution.
The P2059 code means that the powertrain control module has detected voltage from the reductant injection air pump control circuit, indicating that the circuit is open or disconnected. Alternatively, the error could be caused by a malfunctioning air pump relay.
Symptoms of OBD-II Code P2059
If your car’s onboard diagnostic (OBD-II) system detects the P2059 code, you might experience several symptoms. These could include:
1. The check engine light is on
2. Reduced engine power
3. The engine runs roughly
4. Decreased fuel efficiency
5. The engine may stall when idling
6. The engine may emit black or white smoke
It’s essential to pay attention to these symptoms and address them promptly, as they could lead to more significant problems if ignored.
Causes of OBD-II Code P2059
There are several reasons why the OBD-II system might detect the P2059 code. Here are the most common:
1. A damaged wiring harness that connects the air pump control circuit to the power control module. This damage can cause a short circuit or an open circuit in the circuit, which will cause the error code.
2. A defective air pump relay that prevents voltage from reaching the air pump motor.
3. A faulty air pump motor that prevents the air pump from working correctly.
How to Fix OBD-II Code P2059
If you think that your car’s onboard diagnostic system is detecting the P2059 code, you need to take immediate action. Here’s a general way to fix the issue:
1. Check the air pump relay: In most cases, the air pump relay is the culprit. So, if you find any issue with the relay, replace it.
2. Examine the wiring: Inspect the wiring and look for breaks, burns, or frayed wires. Make sure the connections are secure and tight, and replace any damaged wiring.
3. Check the air pump motor: You can check the air pump motor’s functionality with a multi-meter. If the multimeter indicates an open reading or shows no signal, the motor needs to replace.
Case Study
Recently, a customer visited me with a 2011 Chevrolet Silverado 2500HD, and the check engine light was on. The car showed the P2059 code, and the customer experienced rough idling and decreased engine performance.
After examining the car in detail, I found that the air pump motor had failed, and the relay was not providing any voltage to the motor. I replaced the air pump motor and relay and then tested the car again. The issue was resolved, and the customer was happy to have his vehicle back in excellent condition.
Conclusion
The P2059 error code is an important indicator of a problem with your car’s Reductant Injection Air Pump Control Circuit/Open. If you notice the code, don’t ignore it, address it immediately by examining the wiring, air pump relay, and the air pump motor. If you’re not comfortable fixing the issue yourself, take your car to a mechanic who can help you fix it right away.
FAQs
1. Can I still drive my car if the P2059 error code appears?
It’s best if you don’t try and drive the car with the P2059 code. The stalling of the engine or decreased engine performance could cause unanticipated issues leading to severe accidents. It would be best if you take your car to a mechanic immediately after detecting the error.
2. What are the common causes of the P2059 error code?
The most common causes of the P2059 code are a damaged wiring harness that connects the air pump control circuit to the power control module, a defective air pump relay, and a faulty air pump motor.
3. How long will it take to fix the P2059 error code?
The time it takes to fix the P2059 error code depends on the severity and cause of the problem. In some cases, it will take only a few hours, while others could take several days or weeks, depending on the complexity of the issue.
4. Will the P2059 error code reappear after I fix it?
If the mechanic can diagnose the exact issue and repair it by replacing the damaged parts, the error code will not reappear. So when addressed properly, the problem will go away.
5. Is it possible to detect the P2059 code without onboard diagnostic equipment?
No, it’s not possible to detect the P2059 code without OBD-II gear. It’s a good idea to ask a trusted mechanic to check your car if you’re experiencing the code.