ASD and code 42. -
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post #1 of 3 Old 09-17-2002, 09:36 AM Thread Starter
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ASD and code 42.

What is the cause of the computer code of 42 on a 97 ZJ?
Any clues? Thanks.

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post #2 of 3 Old 09-17-2002, 04:33 PM
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According to my Haynes manual this is a problem with the Fuel gauge sending unit. Is your gas guage working right? The 42 Check Engine Light Flash Code is covered by three Generic Scan Tool Codes. They are:
P0462 - Fuel Level Sending Unit Volts Too Low (Open Circuit between PCM and fuel gauge sending unit.)
P0463 - Fuel Level Sending Unit Volts Too High (Circuit shorted to voltage between PCM and fuel fauge sending unit.)
P0460 - Fuel Level Unit No Change Over Miles ( No movement of fuel level sender detected.)

I think you can get the scan codes read at Auto Zone for free.


2000 Jeep Grand Cherokee V8 Stock
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RE 4.5" Extreme Duty Lift, Advanced Adapters SYE, Tom Woods CV Drive Shaft, EA589 10" rims with 33" x 12.5" MT/Rs
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post #3 of 3 Old 10-05-2002, 07:44 AM Thread Starter
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Got the Fuel Sending Unit replaced by the dealership.
Mobster -- thank you for the tip.
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