OBD Guide
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P1040

Reductant Pump Control Circuit Shorted

P1040 is an OBD-II diagnostic trouble code meaning: Reductant Pump Control Circuit Shorted. Common causes: short circuit in the reagent pump wiring harness, reagent pump malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced engine power
  • SCR system fault message
  • Increased fuel consumption
  • Unpleasant exhaust smell

Causes

  • Short circuit in the reagent pump wiring harness
  • Reagent pump malfunction
  • Pump control relay problems
  • Short circuit in circuit connectors
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the reagent pump wiring harness
  2. Check the resistance and operation of the reagent pump
  3. Check pump control relay
  4. Inspect connectors for corrosion or damage
  5. Replace the reagent pump or wiring harness if necessary.

Related codes

P1039P1041P204F

FAQ

What does the P1040 code mean?

P1040 is an OBD-II diagnostic trouble code that indicates: Reductant Pump Control Circuit Shorted

What causes a P1040 error code?

The most common causes of P1040 include: Short circuit in the reagent pump wiring harness; Reagent pump malfunction; Pump control relay problems; Short circuit in circuit connectors.

How do I fix a P1040 diagnostic trouble code?

To fix P1040: Check the integrity of the reagent pump wiring harness. Check the resistance and operation of the reagent pump. Check pump control relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1040?

Yes, but get it checked soon

How much does it cost to fix P1040?

The estimated repair cost for P1040 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat