Cadillac P1800: Transmission Power Supply Relay Malfunction (4L30-E)

Is your scanner showing Cadillac P1800?
No worries. We'll show you what it means and how to deal with it.

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Cadillac P1800: Transmission Power Supply Relay Malfunction (4L30-E)

DIY Difficulty Level
Repair Cost
Can I Still Drive?

What Does The Cadillac P1800 Code Mean?

Key on or engine running and the TCM detected the power supply to TCM terminals 52 and 53 was interrupted. The Shift solenoids, the Band-apply solenoid, and TCC solenoid receive their power through the internal.

What Are The Potential Causes Of The Cadillac P1800 Code?

  • TCM flashes the Sports Lamp when this code is set
  • Transmission power supply relay is open, shorted to ground or shorted to power (B+)

Recommended Parts

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

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts 24276411 Transmission Control Module

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

Reference Sources

GM, 2013, Service Bullettin – Prior To Any Circuit Testing.

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