Auto hold light on and power steering out.

You most likely have a circuit problem with the power steering motor. There will be codes in the power steering module so it would be worth determining what those codes are as it will point you in the right direction of the circuits to check. Based on the symptom you are describing, it is most likely that the power steering motor/module is losing power, ground or communication with the rest of the modules in the vehicle. If you don’t have access to a scan tool that can read the codes in the power steering module, you can start by checking these circuits to see if there is an issue there. I attached a wiring diagram of the MDPS module (power steering module) where you can see the red wire for power, black wire for ground in one of the connectors. Then the other connector has a yellow and black wire for the communication circuits. The MDPS is mounted to the steering column on this vehicle.

I will say that your best bet to not having to waste any time checking circuits that may not be involved with your fault would be to get codes scanned in the MDPS module and go from there. If you are able to read the codes and need some additional help, let us know what codes are in this module and we can help from there.

Calibrating the steering angle sensor is important. Missing calibrations can make the vehicle act erratically though it isn’t likely the other codes are setting due to this. If the calibration hasn’t been done after replacement or an alignment, that would be good to do though it is doubtful it will resolve the concern.

The codes setting are for different things so I wonder if they set during other work that has been completed? It would be best to get a current scan with both of those warning lights on and see what codes are setting right now. Codes have different labels and we really want to see codes in the Current category. If this are historical and your vehicle was worked on recently, they might lead us where we don’t need to go! Can you confirm if these codes are setting as Current codes? The other reason I say that is because these codes don’t seem like they would cause a loss of power steering.

If these are current, the C1358 is where I would start. The AVH switch or the wires could have an open or short. This could also cause the C1652 because that code sets for invalid data and may just be setting because of a switch/wire fault. Here are a couple of pictures, the circuit from the auto hold switch to the module could be shorted to a power circuit and causing the code. It would require testing between the module and the switch. Again, I don’t see how this would cause a loss of power steering but if these codes are current, start there.