Chevrolet P1634: Improper Ignition 1 Signal Voltage

Is your scanner showing Chevrolet P1634?
No worries. We'll show you what it means and how to deal with it.

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OBDCodex, Editor

Chevrolet P1634: Improper Ignition 1 Signal Voltage

DIY Difficulty Level
Repair Cost
Can I Still Drive?
Yes (Short-term only)

What Does The Chevrolet P1634 Code Mean?

There is no Class II serial data circuit condition.

What Are The Potential Causes Of The Chevrolet P1634 Code?

  • Faulty Ignition Control Module (ICM)
  • Faulty Ignition 1 Power
  • Ignition 1 Power harness is open or shorted
  • Ignition 1 Power circuit poor electrical connection

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

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

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