Check engine light code

Question

1999-2006 Volkswagen Jetta

The fourth generation Volkswagen Jetta, also called the MK4 or the Bora, is Volkswagen's family sedan.

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My 2002 Jettas check engine light is on and when I scanned it it reads

''Internal module checksum error"

What does this mean and how do I fix it?

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S W @avanteguarde Rep: 48.3k 7 66 97 · Answer 1 · 2018-01-07T01:24:34-07:00

Most Helpful Answer

Rep: 48.3k

7

66

97

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Possible causes

• Faulty Powertrain Control Module (PCM)

• Powertrain Control Module (PCM) harness is open or shorted

•Powertrain Control Module (PCM) circuit poor electrical connection

•Low battery voltage

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