OBD Guide
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P1018

Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage

P1018 is an OBD-II diagnostic trouble code meaning: Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage. Common causes: open or short circuit in the sensor power supply circuit, faulty reducer module. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption
  • Possible emergency operation of the engine
  • Increased emissions of nitrogen oxides

Causes

  • Open or short circuit in the sensor power supply circuit
  • Faulty reducer module
  • Fuse problems
  • Wiring harness damage
  • Engine ECU malfunction

How to Fix

  1. Check power supply fuses
  2. Inspect the wiring harness for damage
  3. Check the voltage at the reducer module sensor
  4. Test the reductant module
  5. If necessary, replace the module or repair the wiring

Related codes

P1017P1019P1020

FAQ

What does the P1018 code mean?

P1018 is an OBD-II diagnostic trouble code that indicates: Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage

What causes a P1018 error code?

The most common causes of P1018 include: Open or short circuit in the sensor power supply circuit; Faulty reducer module; Fuse problems; Wiring harness damage.

How do I fix a P1018 diagnostic trouble code?

To fix P1018: Check power supply fuses. Inspect the wiring harness for damage. Check the voltage at the reducer module sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1018?

Yes, but get it checked soon

How much does it cost to fix P1018?

The estimated repair cost for P1018 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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