Cadillac P1641: MIL Control Circuit Malfunction

Is your scanner showing Cadillac P1641?
No worries. We'll show you what it means and how to deal with it.

Presented by
Randy Worner

Cadillac P1641: MIL Control Circuit Malfunction

OVERVIEW
Severity
:
Medium
DIY Difficulty Level
:
Intermediate
Repair Cost
:
$100-$250
Can I Still Drive?
:
Yes

What Does The Cadillac P1641 Code Mean?

Engine started, engine runtime 10 seconds, and the PCM detected the MIL fault line was low for 2.5 seconds.

What Are The Potential Causes Of The Cadillac P1641 Code?

  • MIL control circuit is open, shorted to ground or to power (B+)
  • MIL (lamp) is damaged or failed (located in Instrument Cluster)
  • MIL power circuit is in the Instrument cluster
  • PCM has failed
  • TSB 71-65-26 contains a repair procedure for this code

Recommended Parts

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

>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> GM Genuine Parts 12633238 Engine 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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