P2064 Fault Code

Reductant Supply Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2064 fault code indicates an issue with the reductant supply control circuit. This fault typically involves an excessively high voltage or current detected within the reductant system, which is responsible for managing the flow of diesel exhaust fluid (DEF) in vehicles equipped with selective catalytic reduction (SCR) systems. Proper reductant management is crucial for reducing nitrogen oxide (NOx) emissions in diesel engines.

What are the symptoms of the P2064 code?

When a P2064 code is present, drivers may experience:

• Check Engine Light (CEL) illumination on the dashboard.
• Possible reduced engine power or performance issues due to the vehicle entering limp mode.
• Increased emissions output or a failure to pass emissions inspections.
• Unusual noises from the reductant system, primarily during operation.

What causes the P2064 code?

Several factors can lead to a P2064 fault code, including:

• A defective reductant pump or a failure in the electric connections to the pump.
• Short circuits or worn-out wiring in the reductant supply circuit.
• Faulty reductant injector or sensor malfunctions.
• Contaminated or poor-quality diesel exhaust fluid that affects pump performance.

How to fix P2064?

To resolve the P2064 fault code, consider the following steps:

• Inspect and test the reductant supply circuit, checking wiring and connectors for damage or short circuits.
• Examine the reductant pump and replace it if it's found to be faulty.
• Test and potentially replace the reductant injector and its associated sensors.
• Ensure that only high-quality diesel exhaust fluid is used to prevent contamination.