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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6481
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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Ford C-Max: I keep getting motor coolant over temp on 2013

Customer Question

I keep getting motor coolant over temp on 2013 Ford C-Max hybrid? Changed engine water pump, thermostat, electric fan...same thing. When you shut the car off and restart it wont come back for couple of hours? What else can this be?
Submitted: 2 years ago.
Category: Ford
Expert:  A. Penland replied 2 years ago.
Hello and thanks for using JustAnswer.I will try my best to help you with your question.
DO you have the actual trouble code?
Customer: replied 2 years ago.
No it's not giving trouble code
Expert:  A. Penland replied 2 years ago.
Where are you getting the Motor Coolant Over temp warning from?
Instrument cluster?
Customer: replied 2 years ago.
Yes pops up say motor coolant over temperature
Expert:  A. Penland replied 2 years ago.
Ok. With the Hybrids, this is delicate. You will need to check for trouble codes in the instrument cluster. What are you using to check for trouble codes?
Customer: replied 2 years ago.
Snap on computer is not showing any codes.... There telling me is hybrid pump I changed main engine...when the car over heats shut off for 10 minutes then drive it doesn't come back...
Expert:  A. Penland replied 2 years ago.
Who told you to replace the coolant pump?
Customer: replied 2 years ago.
Here dare trouble codes
Expert:  A. Penland replied 2 years ago.
What Snap On scan tool are you using?
Modis
Solus
MT2500
Customer: replied 2 years ago.
I sent u the trouble codes from cluster
Customer: replied 2 years ago.
Expert:  A. Penland replied 2 years ago.
Are these from the cluster or from all the modules?
The P06B8 is from the PCM (Engine Computer).
None of these codes state coolant pump.
Customer: replied 2 years ago.
These are from cluster
Expert:  A. Penland replied 2 years ago.
Clear all the codes you got with the Snap On Ethos and retest the system. Ignore the cluster DTCs right now.
Customer: replied 2 years ago.
What my mechanic said the hybrid side is overheating that's why getting pcm trouble code....he said could b hybrid cooling pump or internally on transmission...they cleared and retested same codes come up
Expert:  A. Penland replied 2 years ago.
The codes U0140 and U0422 from the Instrument cluster are for invalid data and loss of communication with the BCM (Body Control Module). The cluster is having issues talking with the BCM. There are no DTCs that concern the Hybrid coolant pump. You have a network issue in the vehicle between the cluster an the BCM.
Customer: replied 2 years ago.
Meaning I need to change?
Expert:  A. Penland replied 2 years ago.
You will need to have the BCM (Dash Fuse Box) tested properly for trouble codes and have the communication network tested between the Cluster and the BCM.
Customer: replied 2 years ago.
Basically it's a short in the wiring?
Expert:  A. Penland replied 2 years ago.
Either a short, open or a failed module.
Customer: replied 2 years ago.
Could replacing the transmission damage the bum?
Expert:  A. Penland replied 2 years ago.
Did you replace the transmission recently?
Customer: replied 2 years ago.
Yes right after I did that it started happening
Expert:  A. Penland replied 2 years ago.
You may want to look over the wiring around the Transmission. A harness may be unplugged or pinched or a ground may be loose.
Customer: replied 2 years ago.
Could this be a bad transmission causing it? Only happens when the car is heating up and weather is above 70 degrees
Expert:  A. Penland replied 2 years ago.
Possible TCM (Transmission Control Module). But proper testing would need to be done. These new vehicles, especially hybrids, are tricky to diagnose.
Customer: replied 1 year ago.
Well turned out to be the transmission oil... needed changing the car never overheated again...
Expert:  A. Penland replied 1 year ago.
Thank you for the update. Glad to hear you have the problem resolved.