Multiple codes on 2004 Grand Cherokee Limited 6 cyl -
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post #1 of 3 Old 07-12-2020, 11:25 PM Thread Starter
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Multiple codes on 2004 Grand Cherokee Limited 6 cyl

Hello - engine light on 2004 - dealer ran diagnostics
Fan not turning

Codes P0601. ( pcm )
P1489 P1490. ( low and high speed relays )

Is this really a PCM issue and need to replace, or is it a fan relay that needs to be replaced

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post #2 of 3 Old 07-13-2020, 06:13 AM
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2004 WJ 
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Location: South Bend, IN
Posts: 397
Anytime your seeing a P0601 that module is telling you there are shorts on the main board that cannot be repaired.

If you happen to be local to me drop by I have loaner pcm's available to forum members you can use for troubleshooting to see if you have an additional relay issue as well.

Send me a PM if you need some help.
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post #3 of 3 Old 07-14-2020, 07:45 PM
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2004 WJ 
Join Date: Dec 2014
Location: Butler, PA
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If you correct the first issue with the P0601, the other two codes, and any other future issues, should disappear.

2004 Special Edition WJ. LOADED!
2004 Rocky Mountain Edition. Froggy Bandit. Wife's Daily Driver. PRISTINE! Stock height and may stay that way.....
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