Have a bit of an odd one here and I think the issue is electronic / electric rather than mechanical
Had the cruise control on on the motorway and all of a sudden the speed starts dropping, checked I wasn't climbing, hit the + button, no speed increase, pressed the throttle peddle down, no response, cruise off, throttle peddle down still nothing, by now I've made my way to the slow lane, drop a gear, throttle peddle down and still nothing so I coast to the nearest SOS box and stop, pressed the throttle peddle down the engine responds like nothing happened. I shut it down, checked under the bonnect for anything unsual such as smoke, loss of fluids etc. Decided to carry on with my journey and put the cruise back on, about 20 mins later same thing again,
Pulled over, throttle responds so carried on again without shutting down and didn't use the cruise for the remainder or my journey, 30 mins later got home put my scanner on and found P0489 logged. Very much doubt the EGR valve has failed but itis possible that the sensor is not happy.
Didn't reset code as I was going to call Ford Assist (included with the dealer service) out in the morning. Got up early, had a nose around the bonnet and nothing stood out, started the engine up and noticed that the charge light stayed on, scanner back on, P0622 was now logged.
Called Ford Assist, AA came out, explained the above and we both agreed it's not mechanical, while the charge light was still on noticed that none of the heated screens would come on, A/C disabled understandably so.
EGR sensor connector was clean, battery termnials OK, same on alternator, system was charging OK. Has not had a full charging test done.
After coming up empty handed the only thing left to do was clear the codes and that was the end of it. I have been up and down the motor way during day light hours and the odd late evening running and I have not had the throttle peddle lock out on me.
This was last sunday, 70 mile trip from A to B and a fuel stop 20 miles in. Last night same journey, slightly longer due to an accident and detour, 10 miles to go and on cruise the bug struck again, came off at my exit and knowing what I know, as soon as I come to a rest the throttle peddle will come to life. Got to the traffic lights and as I guessed, throttle peddle responded, got home OK, scanner on and P0489 was logged.
The only difference was last night I didn't use any of the heated windscreens but I had 2 fuel stops, one just in case because of the detour and the second when I got to my regular shell stop. Last night the night time running was an hour longer and based on what I can count as events I should have had more instances of the throttle peddle being locked out if the was battery / alternator / charging system.
Car is due for a service in less than 800 miles, it is on 77900. The alternator has always had a slight whine, well over 3 years now. Intake manifold elbow replaced 1k miles ago.
Enginer performace is perfect except for this "issue" and fuel economy is the same.
I clearly have a gremlin and I'm down to:
1. EGR sensor is on it's way out, it's still a monifold replacement - costly.
2. Alternator is on its way out - will have to be replaced at some point.
3. Battery giving up - another item that will eventually need to be replaced.
4. Wiring issue.
5. Charging system not happy.
Has anybody had a P0489 and a P0622 logged one after the other, I have no idea how I'm going to isolate things and everything I have researched has not come up with a firm solution. I'm keen to find out how the 2 fault codes are related.