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Old 04-18-2009, 10:15 AM   #1 (permalink)
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Default CEL Codes P1777 and P1708

Hello All, I have 2 codes and I think I need to get these fixed to be able to get a North Carolina inspection. I have a 97 Disco Automatic SE. Looks like P1708 is Transfer Box Line Short Circuit Fault. And P1777 is Gearbox ignition retard request line fault. I have cleaned the MAF and installed a new battery. Any ideas to track this down? Thanks
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Old 04-18-2009, 08:18 PM   #2 (permalink)
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Have you cleared the codes and they came back the same? If not, I would clear the codes and see if they come back before I went looking.
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Old 04-18-2009, 08:37 PM   #3 (permalink)
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Yes. Have cleared them. P1777 came back on very soon. P1708 came back on after I touched the Transfer Box lever. The truck shows 214K but it is said to have a replacement motor and tranny. Everything seems pretty normal except it shifts hard.
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Old 04-20-2009, 04:28 AM   #4 (permalink)
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Default More info

I located the cable that runs to the top of the transmission from beside the throttle cable. After a few test drives adjusting on that it shifts at a much lower rpm and very smooth. I cannot locate the black box beside the transmission that many report cleaning and resealing to fix codes. Also does anyone know if the transmission has to be properly grounded? If it is a replacement is that a possibility...that its not grounded? Thanks for any help guys.
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Old 04-20-2009, 07:09 AM   #5 (permalink)
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Hey hikingboot, can you tell me how you went about adjusting the cable? Mine shifts at high RPM and at times can be rough when doing so, esp when it shift into the last gear... generally right at 50 mph. What part of NC are you from?
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Old 04-20-2009, 09:23 AM   #6 (permalink)
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Asheville here. I backed the nut up to the loosest setting and then adjusted from there. It's probably at around an inch now. PM me your email addy if you want a picture of it.
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Old 04-20-2009, 04:40 PM   #7 (permalink)
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Default I think I've solved the case.

I think I have the wrong ECM. My codes are for sensors that I don't think my truck has yet the newer ecm thinks it should. http://www.gomog.com/allmorgan/GEMS/GEMSbyPoole.pdf My wiring harness does not have wires for pins 4 and 31. The ECM out of the disco is MKC104420 GEMS8. Can anyone now tell me what number ecm to buy or even better sell me one? Thanks for the resources to solve this.
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Old 08-19-2013, 05:51 PM   #8 (permalink)
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does anyone know if this p1777 gearbox fault is okay to drive on?
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