carpetman112 Posted August 30, 2009 Share Posted August 30, 2009 My car won't go into overdrive 90% of the time. When it first started it was about 50% of the time but it has gotten worse. I'm not getting any transmission codes..I'm getting knock sensor 1 and 2 codes. P1135 heater ckt and p0125 insufficient temp for closed loop. I started with the p0125 and changed the thermostat but that wasn't my problem. Any suggestions before i waste any more time and money. I drive this car 60 miles a day which is hard to do with no overdrive. Thanks Quote Link to comment Share on other sites More sharing options...
branshew Posted August 30, 2009 Share Posted August 30, 2009 None of those codes seems related to a transmission problem. On the code side - it could be a faulty coolant temp sensor. Quote Link to comment Share on other sites More sharing options...
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