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C121D Brake pressure circuit

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Old Jun 24, 2021 | 02:39 PM
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Steve Torino
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Default C121D Brake pressure circuit
Hi Guys,
Anyone had the code C121D on a 4th gen Ram Truck.
I’m in the UK and struggling to find anyone that seems to know what’s going on with it.
Any help would be appreciated.
 
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Old Jun 24, 2021 | 05:00 PM
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Here is some info on it. I can't speak to the accuracy, or even if it applies to your truck...... Most of what they are talking about in some of the later steps, I have no clue what they are.
 
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Old Sep 23, 2022 | 06:57 AM
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Default Separate ECU from HCU
Separate ECU from HCU.
How is this accomplished?
Disconnect a harness?
Or physically mechanically remove?

Tia
James
 
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