P2061 A high rate of reducing agent injection air pump control circuit

P2061 A high rate of reducing agent injection air pump control circuit

OBD-II DTC Datasheet

Reductant Injection Air Pump Control Circuit High Signal

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code and applies to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, Dodge, Ram, Sprinter, Mercedes Benz, Ford, Audi, Volkswagen, etc. Despite the general nature, the exact repair steps may vary depending on the year of manufacture, make, model and configuration. transmissions.

A stored code P2061 means the powertrain control module (PCM) has detected an excessive voltage in the reductant injection air pump control circuit. The word "open" can be replaced by the word "disabled".

Today's larger, more powerful (environmentally friendly) diesel engines cannot meet stringent federal (US) emission standards with only EGR, a particulate filter / catalytic converter, and a NOx trap. For this reason, selective catalytic reduction (SCR) systems have been invented.

The SCR system injects a reductant formulation or Diesel Exhaust Fluid (DEF) into the exhaust gases along with a defined amount of air upstream of the particulate filter, NOx trap and / or catalytic converter through a reductant injection valve (solenoid). The precisely calculated DEF / air injection raises the temperature of the filter element and allows it to work more efficiently. It extends the service life of the filter elements and helps reduce emissions of harmful exhaust gases into the atmosphere. The entire SCR system is monitored and controlled by either the PCM or a stand-alone controller (which interacts with the PCM). In any case, the controller monitors the O2, NOx and exhaust gas temperature sensors (as well as other inputs) to determine the appropriate timing for DEF (reductant) and air injection. Precision DEF injection is required to keep the exhaust gas temperature within acceptable parameters and to optimize the filtration of pollutants.

The reductant / regeneration pump is used to pressurize the DEF in the reductant liquid system for use when needed. The PCM monitors the supply pump voltage for continuous fluctuations and load percentage. The PCM also monitors one or more pressure sensors in the reductant supply system to determine if there is a leak in the system.

If the PCM detects excessive voltage on the reductant injection air pump control circuit, code P2061 will be stored and a malfunction indicator lamp (MIL) may come on. MIL illumination may require multiple ignition cycles - in case of failure.

What is the severity of this DTC?

A stored P2061 code should be treated as serious and should be dealt with as soon as possible. The SCR system could be disabled because of this. Catalyst damage can occur if the conditions that contributed to the code persistence are not corrected in a timely manner.

What are some of the symptoms of the code?

Symptoms of a P2061 trouble code may include:

• Decreased fuel efficiency
• Excessive black smoke from vehicle exhaust
• Reduced engine performance
• Other codes related to SCR

What are some of the common causes for the code?

Reasons for this code may include:

• Reducing agent air pressure sensor defective
• Reducing agent injection air pump defective
• Open or short circuit in a chain in the system of the air pressure sensor for injection of a reductant
• Bad SCR / PCM controller or programming error

What are some steps to troubleshoot the P2061?

Make sure the reductant / regeneration system does not lose pressure (internal or external). Turn on the pump to build up pressure and check the system for external leaks. Use a fuel pressure tester to manually monitor the pressure in the reductant system. Check the feed pump and nozzle for leaks. If leaks (internal or external) are found, they must be repaired before continuing with the diagnosis.

To diagnose the P2061 code, you will need a diagnostic scanner, a digital volt / ohmmeter (DVOM), and a source of vehicle-specific diagnostic information.

You can use your vehicle information source to find a Technical Service Bulletin (TSB) that matches your vehicle's year, make and model; as well as engine displacement, stored codes and symptoms detected. If you find it, it can provide useful diagnostic information.

Use a scanner (connected to the vehicle's diagnostic socket) to retrieve all stored codes and associated freeze frame data. It is recommended that you write down this information before clearing the codes and then test drive the vehicle until the PCM enters ready mode or the code is cleared.

If the PCM enters ready mode at this time, the code is intermittent and can be much more difficult to diagnose. In this case, the conditions that contributed to the retention of the code may need to worsen before an accurate diagnosis can be made.

If the code is reset immediately, the next diagnostic step will require you to search your vehicle information source for diagnostic block diagrams, pinouts, connector faceplates, and component test procedures / specifications.

Step 1

Use the DVOM to test the reductant injection pump control circuits, components and sensors according to the manufacturer's specifications. Circuit DTCs can be caused by faulty components or sensors. Sensors and components that do not pass the test within the maximum allowable parameters shall be considered defective.

Step 2

If the air pressure of the reductant is within specifications, the P0259 code is stored and all preliminary circuits, components and sensors are operational, use the DVOM to test the input and output circuits between the sensors and the PCM / SCR controller. Disconnect all controllers before using the DVOM for testing.

• Reductant injector air pump control circuit codes are often associated with feed pumps that have an internal leak.

Related DTC discussions

• There are currently no related topics in our forums. Post a new topic on the forum now.

Need more help with the P2061 code?

If you still need help with DTC P2061, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.