Immobilizer malfunction

[sleepyboijoe]

It really annoys me that my second thread on here is another issue but oh well gotta deal with it. So recently had my fiesta st battery drained and had it jump started and running. Was driving it home but my instrument cluster and climate controls just all dropped to zero. Got it home then hooked it up to a battery charger and left it. Started it a few times to see if that’d speed the process up. The battery reached full charge but now just states an immobilizer malfunction and won’t crank. The dash lights up but doesn’t read much apart from miles. The climate doesn’t work at all, spare key doesn’t change the story. The codes it lists are; P217, P2610, and U0422. All the related fuses look good and recently replaced a relay aswell. Did I fry my ecu somehow? My keys unlock and lock like usual

 

[Capri to ST]

It really annoys me that my second thread on here is another issue but oh well gotta deal with it. So recently had my fiesta st battery drained and had it jump started and running. Was driving it home but my instrument cluster and climate controls just all dropped to zero. Got it home then hooked it up to a battery charger and left it. Started it a few times to see if that’d speed the process up. The battery reached full charge but now just states an immobilizer malfunction and won’t crank. The dash lights up but doesn’t read much apart from miles. The climate doesn’t work at all, spare key doesn’t change the story. The codes it lists are; P217, P2610, and U0422. All the related fuses look good and recently replaced a relay aswell. Did I fry my ecu somehow? My keys unlock and lock like usual

These cars are very sensitive to batteries which don't have full power. Even though you jumped yours, if it's still not at full power it could be an explanation for these odd electrical issues. Replacing the battery could be a start in diagnosing the problem.

 

[sleepyboijoe]

These cars are very sensitive to batteries which don't have full power. Even though you jumped yours, if it's still not at full power it could be an explanation for these odd electrical issues. Replacing the battery could be a start in diagnosing the problem.

Sad part is I even bought a new battery and switched them out, then when the old battery was 100% even put that in to try

 

[sleepyboijoe]

Tested all the fuses, they all came back fine. Tested both batteries, both are fine. Checked the wiring connected below the headlight, those pins are fine. Relays all seem good. Could it be the instrument cluster itself? Would that also affect the ac and immobilizer? I don’t have the money to go and get this checked out and fixed sadly. Any help and guidance would be appreciated. I bought this car hoping to be fun and reliable but here I am flat out on my ass losing hope

 

[XR650R]

Tested all the fuses, they all came back fine. Tested both batteries, both are fine. Checked the wiring connected below the headlight, those pins are fine. Relays all seem good. Could it be the instrument cluster itself? Would that also affect the ac and immobilizer? I don’t have the money to go and get this checked out and fixed sadly. Any help and guidance would be appreciated. I bought this car hoping to be fun and reliable but here I am flat out on my ass losing hope

This is just a Hail Mary, but I'd disconnect the battery for an hour or more, then reconnect it and hope for a hard reset.

 

[sleepyboijoe]

This is just a Hail Mary, but I'd disconnect the battery for an hour or more, then reconnect it and hope for a hard reset.

I’ve left it off for more than a day recently, could it be a bad ground?

 

[XR650R]

I’ve left it off for more than a day recently, could it be a bad ground?

Maybe. You mentioned codes.
You could try disconnecting the battery again. Hold the positive and negative together for about 5 minutes to drain any residual current in capacitors in the system. This will force a system reset. It will to also clear any and all codes. If that doesn't do it, I got nothin'.

 

[sleepyboijoe]

Maybe. You mentioned codes.
You could try disconnecting the battery again. Hold the positive and negative together for about 5 minutes to drain any residual current in capacitors in the system. This will force a system reset. It will to also clear any and all codes. If that doesn't do it, I got nothin'.

Sadly nothing. Even cleaned the negative battery ground. Maybe I did fry something considering only the backlights turn on

 

[Ludeem1]

I had a similar issue a few years back, my car didn’t turn on at, no lights, keys didn’t even unlock the car. Battery was good. It turned out my accesport cable was shorting out the BCM. I also got an immobilizer malfunction warning. As soon as I unplugged it everything worked as normal. Got a new one and never came back since. Maybe the BCM got damaged when you jump started the car.

 

[TyphoonFiST]

I had a similar issue a few years back, my car didn’t turn on at, no lights, keys didn’t even unlock the car. Battery was good. It turned out my accesport cable was shorting out the BCM. I also got an immobilizer malfunction warning. As soon as I unplugged it everything worked as normal. Got a new one and never came back since. Maybe the BCM got damaged when you jump started the car.

What Did you get New? A Cobb ap3? Or a new cord for the Ap3?

 

[Ludeem1]

What Did you get New? A Cobb ap3? Or a new cord for the Ap3?

Just the cord