OBD Guide
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P1048

Reductant Injector High Control Circuit Low Voltage

P1048 is an OBD-II diagnostic trouble code meaning: Reductant Injector High Control Circuit Low Voltage. Common causes: reductant injector malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Check engine light is on
  • Reduced engine power
  • Increased fuel consumption
  • Unusual odors from the exhaust system
  • Activating emergency engine operation

Causes

  • Reductant injector malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • SCR control module malfunction
  • Control circuit power problems

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check control circuit voltage
  3. Test the resistance of the reductant injector
  4. Check the operation of the SCR control module
  5. Replace faulty reductant injector if necessary

Related codes

P1047P1049P1050

FAQ

What does the P1048 code mean?

P1048 is an OBD-II diagnostic trouble code that indicates: Reductant Injector High Control Circuit Low Voltage

What causes a P1048 error code?

The most common causes of P1048 include: Reductant injector malfunction; Open or short circuit in wiring harness; Poor contact in connectors; SCR control module malfunction.

How do I fix a P1048 diagnostic trouble code?

To fix P1048: Check the integrity of the wiring harness and connectors. Check control circuit voltage. Test the resistance of the reductant injector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1048?

Yes, but get it checked soon

How much does it cost to fix P1048?

The estimated repair cost for P1048 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat