2000 Jeep Grand Cherokee issues

Hello, I've been having intermittent issues with my 2000 GC. It surges and shifts when driving at a constant rate down the free way and in town. I had suspected it could be transmission related but some of the posts here make me think that it might actually be related to the ECM. I did pull engine codes from the odometer as well and they seem to be leaning in that direction as well.

The codes from the odometer are as follows:
P 0121 TPS signal does not correlate to MAP sensor signal.
APPS voltage input below the minimum acceptable voltage.

P 0201 An open or shorted condition detected in control circuit for Injector # 1 or the INJ 1 injector bank.

P 0202 An open or shorted condition detected in control circuit for Injector # 2 or the INJ 2 injector bank.

P 0203 An open or shorted condition detected in control circuit for Injector # 3 or the INJ 3 injector bank.

P 0204 Injector # 4 or INJ 4 injector bank output driver stage does not respond properly to the control signal.

P 0206 Injector # 6 output driver stage does not respond properly to the control signal.

P 0207 Injector # 7 output driver stage does not respond properly to the control signal.

P 0208 Injector # 8 output driver stage does not respond properly to the control signal.

P 1594 Battery voltage sense input above target charging voltage during engine operation.

Anyone have any advice on where to look from here based on the engine codes I'm getting?

Reply 1 : 2000 Jeep Grand Cherokee issues

Forgot to mention, the problem does seem to be worse in wet weather or on hot days when the AC has been running for a long time. Both of which also make me think it could be electrical rather than the trans.

Reply 2 : 2000 Jeep Grand Cherokee issues

Having exact same issues, EXACT, have you had any updates to this problem. I have read many posts that seem to think the tps is the main culprit, looking forward to hearing an update, the dealership said they could not get it to repeat issue codes had cleared before I took it to them. It seems to always do the surging thing on the highway along with a slight increase/decrease in rpm's but does not always throw the code. SO FRUSTRATING.

Reply 3 : 2000 Jeep Grand Cherokee issues

No updates thus far. I'm guessing this forum doesn't see a ton of traffic like some of the others I've been to.