Hello everyone,
Crank but no start issue.
Canadian climate – Alberta.
I have a 2014 Jeep Patriot Limited 2.4L with approximately 175K KM. After driving a short distance and leaving my vehicle for ~30 minutes, I got back inside and the vehicle would not start (but did crank). The starter sounded like it was “dragging” while trying to crank. I received a boost as I noticed my dash lights dimming while trying to start. No luck.
There was an electrical symbol and check engine light and with a Innova 3030 reader, the following codes were read:
P0122 – Permanent
Throttle/Pedal Position Sensor A Circuit Low Input
P0222 – Permanent
Throttle/Pedal Position Sensor B Circuit Low Input
P2135 – Permanent
Throttle Position Sensor 1 / 2 Correlation
These codes, once cleared on the reader, come back immediately upon putting the vehicle in the ON position.
I got a brand new battery, and the same symptom, crank but no start.
I towed the vehicle home and after much research, decided to pull the throttle body and starter motor. The starter was in rough shape and the following day I picked up a new one from Napa. I installed it and after all was connected back, the same symptom occurred. I then picked up an OEM throttle body, installed it and the same symptom occurred. I also tried using an older throttle body (at the time of this incident, I was using an aftermarket TB which had lasted for years), the same symptom occurred.
After putting in the new throttle body, one of the codes changed to yield the following (the P2135 went away and the U0401 came up):
P0122 – Permanent
Throttle/Pedal Position Sensor A Circuit Low Input
P0222 – Permanent
Throttle/Pedal Position Sensor B Circuit Low Input
U0401 – Permanent
Invalid Data Received From ECM/PCM
I tested the new throttle body by reading from the pink 5V pin and got a reading of 4.989V DC when the vehicle was in the ON position. I did not validate that 5V was delivered upon starting / cranking the vehicle.
I validated with my meter through a continuity test that all the fuses in the main engine-bay fuse box were good. I also re-sat them all.
I noted that the oil level was low (half way to SAFE marker) so I topped it off just in case there was an oil level sensor.
The relay box on the driver-side wheel well has not been checked, is this worth checking for corrosion / damage?
At this point with a brand new battery, throttle body and starter motor, I am not quite sure what next steps I should do before throwing in the towel and towing it to a Jeep dealership for diagnostics.
Would appreciate any and all input you have.
Thank you so much in advance.
