Engine-Codes - Cadillac - P1056 CADILLAC

P1056 CADILLAC Code - Reductant Pump Low Speed

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P1056 CADILLAC code possible causes

  • Faulty Reductant Pump and Sensor Assembly
  • Reductant Pump and Sensor Assembly harness is open or shorted
  • Reductant Pump and Sensor Assembly circuit poor electrical connection
  • Faulty Reductant Control Module

|How is the P1056 CADILLAC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P1056 CADILLAC code

Labor: 1.0

The cost to diagnose the P1056 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P1056 CADILLAC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What is P1056 CADILLAC code meaning?

The reductant pump motor is controlled by the reductant control module. The Engine Control Module (ECM) sends a command to the reductant control module via a direct wire connection. This command is converted by the reductant control module into the desired pump speed The ECM checks the state of the wire to the reductant control module for circuit continuity. The signal sent by the ECM to the reductant control module is diagnosed for open circuit, short circuit to ground, and short circuit to voltage. The Diagnostic Trouble Code (DTC) will be set when the reductant control module detects that the reductant pump rotor is stalled for greater than 5 s.

|Need more information with the P1056 CADILLAC code?

Need more information on how to fix the P1056 CADILLAC code?
Get Access to Factory Service Manuals

|Need help with a P1056 CADILLAC code?

Get the P1056 Cadillac code diagnosed by a professional: Find a repair shop in your area