What Does P2063 Mean?
The control module has detected an abnormally low voltage signal in the reductant or regeneration supply control circuit, below acceptable operating parameters. This indicates a short to ground or excessive current draw.
Common Causes
35%
Wiring harness chafed or pinched causing short to ground
30%
Failed reductant injector or valve with internal short to ground
20%
Damaged connector with terminal touching ground or moisture intrusion
10%
Reductant pump motor drawing excessive current due to mechanical binding
5%
Control module internal driver circuit fault pulling voltage low
Diagnostic Steps
1
Step 1: Disconnect reductant valve/injector and measure resistance to ground on control circuit; should read infinite resistance
2
Step 2: Inspect wiring harness routing for areas of chafing, heat damage, or contact with sharp edges
3
Step 3: Measure resistance of reductant valve/injector coil and compare to specifications
4
Step 4: Check for moisture or corrosion in all connectors that could create ground path
5
Step 5: Monitor voltage and current draw on control circuit with oscilloscope during operation to identify short
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
The control module has detected an abnormally low voltage signal in the reductant or regeneration supply control circuit, below acceptable operating parameters. This indicates a short to ground or excessive current draw.
The most common cause of P2063 (Reductant/Regeneration Supply Control Circuit Low) is: Wiring harness chafed or pinched causing short to ground
Typical repair costs for P2063 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances but emission system is inoperative. May trigger engine derate or shutdown after grace period expires.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2063 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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