What Does P2064 Mean?
The control module has detected an abnormally high voltage signal in the reductant or regeneration supply control circuit, exceeding acceptable operating parameters. This indicates a short to power or open load condition.
Common Causes
35%
Wiring harness damaged with short to battery voltage or other power source
25%
Open circuit in reductant valve/injector creating high voltage feedback
20%
Failed control relay stuck closed providing constant power
15%
Corroded or backed-out connector pins causing intermittent high resistance
5%
Control module internal driver circuit failure creating false high signal
Diagnostic Steps
1
Step 1: Disconnect reductant valve/injector and measure voltage at control circuit with key on; should read near 0V
2
Step 2: Inspect wiring harness for damage, especially near heat sources or moving components
3
Step 3: Test reductant supply relay for proper operation and check for stuck contacts
4
Step 4: Measure resistance of reductant valve/injector coil for open circuit condition
5
Step 5: Check connector terminal fit and inspect for corrosion or poor contact causing high resistance
Estimated Repair Cost
$150 - $1,100
Parts + labor, varies by vehicle and location
The control module has detected an abnormally high voltage signal in the reductant or regeneration supply control circuit, exceeding acceptable operating parameters. This indicates a short to power or open load condition.
The most common cause of P2064 (Reductant/Regeneration Supply Control Circuit High) is: Wiring harness damaged with short to battery voltage or other power source
Typical repair costs for P2064 range from $150 to $1,100, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to operate but emission control system is not functioning. Engine derate may occur after programmed grace period.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2064 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (Diesel Aftertreatment)
Difficulty
Type
Generic (SAE)
Recommended Tools
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