Audi P1857: Load Signal Error Message From Engine Control

Is your scanner showing Audi P1857?
No worries. We'll show you what it means and how to deal with it.

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OBD Codex, Administrator

Audi P1857: Load Signal Error Message From Engine Control

DIY Difficulty Level
Repair Cost
Can I Still Drive?

What Does The Audi P1857 Code Mean?

The Engine Control Module (ECM) communicates with all databus-capable control modules via a CAN databus. These databus-capable control modules are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information.

What Are The Potential Causes Of The Audi P1857 Code?

  • Intake Manifold Runner Position Sensor is faulty
  • Intake system has leaks (false air)
  • Motor for intake flap is faulty
  • Mass Air Flow (MAF) sensor has failed
  • ECM has failed

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

Audi P1857, DTCDECODE.

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