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2005 Chrysler Pacifica P0706 and P0404: Transmission Stalls on Hills, Won't Shift Smoothly

Model: 2005 Chrysler Pacifica Fault Code: P0404 Posted: 2016-02-13 17:43

I own a 2005 Chrysler Pacifica with an automatic transmission. The vehicle runs normally on flat surfaces and at steady speeds. However, when driving uphill, the transmission unexpectedly drops into first gear and fails to shift up until the vehicle is moving on level ground or descending a hill. This issue occurs consistently during incline driving. I have already scanned the vehicle and received two diagnostic trouble codes: P0706 (Check Shifter Signal) and P0404 (EGR Position Sensor Performance). I am seeking advice on what these codes indicate and how to troubleshoot the transmission shifting problem. Could this be related to the shifter position sensor, transmission fluid level, or a malfunctioning EGR system? Any guidance on next steps would be greatly appreciated.

Related fault codes
P0404P0706
Comments (3)
Anonymous 2016-02-13 17:54

Please scan your vehicle and post the exact diagnostic codes. This will help identify root causes more accurately.

Anonymous 2016-02-13 21:30

I've confirmed two fault codes: P0706 - Check Shifter Signal, and P0404 - EGR Position Sensor Performance. These are critical for diagnosing the transmission shift issue in a 2005 Chrysler Pacifica with an automatic gearbox.

Anonymous 2016-02-14 07:14

Did the post get edited? I missed those codes earlier. First thought: Is this a 4-speed automatic transmission? Possible causes to check: - Transmission fluid level and condition - Remote starter system interference - Did you use an OBD2 scanner to retrieve codes, or did you rely on key-on/off cycling? Are there any other symptoms or warning lights? Note: P0706 (Check Shifter Signal) suggests a problem with the shifter position sensor or signal transmission to the transmission control module. P0404 (EGR Position Sensor Performance) may indicate EGR system issues, which can indirectly affect engine performance and shift timing in some models.