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1999 Pontiac Grand Prix GTP Question: What would cause the HUD to scramble when the car is shifting into overdrive.

 

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jw3013, Red Wing, MN, November 02, 2013, 20:46
 Rookie

We think we are having tranny issues, and noticed that the HUD scrambles up and down when it is shifting into overdrive.

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    pushrod November 02, 2013, 21:06
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     Master

    Does the actual speedometer read correctly? Have the transmission scanned to check if vss is constant while hud is acting up. Is the check engine light on?

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    jw3013, November 02, 2013, 22:46
     Rookie

    The speedometer reads correct. The check engine light is on due to after market fuel cap.

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    pushrod, November 03, 2013, 03:22
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     Master

    Have the transmission "scanned" to see if a problem exists! Have ALL modules scanned for any problems. Not talking about a simple code reader but a scanner. The last time you had the codes read it may have been an evap code stored and someone suggested it was the gas cap, but how about now?

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