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CarGurusMay 27, 2009 - My jeep Liberty 2009 does the same the Dashboard showed a code of cylinder .... i have a jeep liberty 2006 with the # 5 cylinder misfire. i replaced the sparks... I have a 2005 Jeep Liberty 6 cylinder, engine light came on scaned the ... 2002 jeep liberty camshaft posistion sensor error code p0340 5 answers.
DIYer? I recommend a repair manual from your auto parts store. It should provide a complete list of all error codes and likely repair methods. Otherwise find a competent repair shop, or your dealer. I googled your error code This is just one of the answers: http://repairpal.com/check-engine-light-with-code-p1870-057
I am sure you can do a better search since you know far more about the issues.
Code 12 is for a problem with the cam timing, and code 26 is for a problem with the intake valve control solenoid being out of range.
The cam timing would need to be checked along with the control solenoid.
DTC 26 and 27 refers to a QDM (Quad Driver Module) fault. The Quad Driver is a "safety valve" for the ECM controlled circuits, the quad driver controls up to 4 circuits.
There are multiple quad drivers in the ECM. The QDM shuts down a shorted circuit to prevent high current flow from damaging the ECM. So the DTC 26 or 27 will isolate the problem to 1 QDM. You will need a repair manual with electrical diagrams and DTC flow charts to determine which of the circuits controlled by that QDM are failing.
Usually DTC 26 refers to the Torque Converter Clutch solenoid and related circuit. Most likely you have a shorted TCC solenoid or the harness connected to it, The solenoid is internal in the transmission accessible from the side cover.
Also, keep in mind the single most cause for any code will be a power or ground problem. Clean all the battery cables, and any and all cables or wires that attach from the engine to the firewall.
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