getting p1633 fault code that won't reset with OBii reader. Hard fault.
Supposed to be keep alive memory when you disconnect the battery. I changed out my phasers, guides, chains, tensioners and VCTs and had the battery disconnected over the weekend and now getting this code. I checked and rechecked all the connections that were removed during the engine work. Replaced the battery too, as it was showing it was bad on 2 different battery scanners, still have the fault.
Thanks for any help ! Duane

 

Don't know if this fixed it or not. I had a reverse light out and a fan resistor card go bad. I replaced both reverse lights and the heater resistor and the code(engine light) went out, very strange.

 

Well it's back on😞

 

From a quick internet search:

P1633 means that the powertrain control module (PCM) has detected low voltage on the keep alive memory circuit. This is the circuit that supplies constant battery voltage to the keep alive memory portion of the PCM so it can retain information regarding fuel control, idle control and transmission control adaptive strategies to name a few. If the battery is disconnected or voltage drops below 10.5 volts this code will be set. If the battery has not been disconnected then the circuit will need to be checked for opens or high resistance in the wire,shorts,blown fuse, high voltage r/f interference from ignition or charging system components, or the PCM being being faulty itself.

 

Light is killing me !
Now it's intermittent.
Is it possible my fueling issue(filling with gas and able to fill 2 gallons and shuts off, 15 mins to fill) and vapor canister or solenoid could be the issue ?