Diagnostic Code 24, Speed Senor - ZR-1 Net Registry Forums

HIZNHRZ · 05-28-2012

Driving home from a day trip last weekend the speedometer of my 91 ZR-1 stopped working. Along with the speedometer, the trip meter, mpg, gas tank range funtions, and my odometer stopped working as well.

Among other problems I'm getting an error code 24 from the ECM and error codes H41 and H24 from the CCM. It appears I've got a bad Speed Senor. It looks like the the code 41 is the CCM being pissed off that the data link between the ECM and CCM has been broken.

I can find diagrams of the Speed Sensor mounted in the tranmission Extension Housing but I can't find a sensor part number. Anyone know if this is a ZR-1 unique part or common to all ZF 6-speed transmissions. Also, anyone replaced the Speed Sensor before? If so, should I also buy a replacement O-ring? Anything else?

Thanks.

05-28-2012	#1
HIZNHRZ Join Date: Apr 2004 Location: Germantown, MD Posts: 732	Diagnostic Code 24, Speed Senor Driving home from a day trip last weekend the speedometer of my 91 ZR-1 stopped working. Along with the speedometer, the trip meter, mpg, gas tank range funtions, and my odometer stopped working as well. Among other problems I'm getting an error code 24 from the ECM and error codes H41 and H24 from the CCM. It appears I've got a bad Speed Senor. It looks like the the code 41 is the CCM being pissed off that the data link between the ECM and CCM has been broken. I can find diagrams of the Speed Sensor mounted in the tranmission Extension Housing but I can't find a sensor part number. Anyone know if this is a ZR-1 unique part or common to all ZF 6-speed transmissions. Also, anyone replaced the Speed Sensor before? If so, should I also buy a replacement O-ring? Anything else? Thanks.

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