Reductant Supply Control Circuit High Voltage
The P2064 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the reductant/regeneration supply control circuit. This circuit controls the supply of diesel exhaust fluid (DEF) or regeneration fuel to the aftertreatment system. A high voltage reading typically points to a short to power, a faulty sensor, or a malfunctioning control module. This issue can affect the vehicle's emissions system, potentially leading to reduced performance or limp mode.
01. Most Common Causes
- Short to power in the reductant supply control circuit
- Faulty reductant supply control module or sensor
- Damaged wiring or connectors in the circuit
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Possible increased emissions or failed emissions test
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and freeze frame data.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or shorts.
Step 3: Test the circuit voltage with a multimeter to confirm high voltage condition.
Step 4: Check the reductant supply control module and sensor for proper operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it may cause reduced performance or limp mode, and could lead to further emissions system damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but may vary depending on the specific cause and labor rates.