Brake pressure sensor..
Site Moderator-Dodge Tech
Joined: Sep 2010
Posts: 3,724
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From: Nashville, Tennessee
Never heard of such a thing. When they get the part # on the repair order, I'd be curious to see what it actually is. I think the only sensors that affect the breaking are the wheel speed sensors. The system does go through a self test at start up so maybe there is some kind of sensing going on that they need to fix. Maybe TNtech knows about this sensor.
Brake pressure sensor (hydraulic)? It should be inside the HCU. Not replaceable. I started seeing them on the 2005 LX cars 300/Charger that had ESP. The test back then was pretty unreliable as the ABS module would just store the most recent signal in the data, so separating the ECU and the HCU told you nothing. I hope the test has changed. They should have found a way to screw it into the HCU block, but they didn't.
Sorry for being late to the party
Last edited by TNtech; Jan 17, 2014 at 06:12 PM.
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Veteran
Joined: Apr 2006
Posts: 404
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From: Nova Scotia
As I said earlier
The words of the tech who worked on the truck
Complaint --- scan test and check cause of abs light on and scan abs light found code
Cause ------- C121E - brake pressure comparative performance
Check and found the brake pressure sensor switch working intermittently
Correction -----order new switch
replace switch
part number------ 56038914-AC switch 08-058-060
The words of the tech who worked on the truck
Complaint --- scan test and check cause of abs light on and scan abs light found code
Cause ------- C121E - brake pressure comparative performance
Check and found the brake pressure sensor switch working intermittently
Correction -----order new switch
replace switch
part number------ 56038914-AC switch 08-058-060
Site Moderator-Dodge Tech
Joined: Sep 2010
Posts: 3,724
Likes: 22
From: Nashville, Tennessee
C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE
BRAKE SWITCH SIGNAL OPEN
INTEGRATED CONTROL UNIT
- When Monitored: With the ignition on.
- Set Condition: When the Anti-Lock Brake Module indicates that the Brake Pressure Sensor Signal is irrational.
BRAKE SWITCH SIGNAL OPEN
INTEGRATED CONTROL UNIT
Record Breaker
Joined: Jul 2012
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It was replaced on Thursday DodgeCACares. It seems to have a more audible click than the original. As I said yesterday, It was replaced with Part #56038914AC replaces: 56038914AA, 56038914AB (found this info on the net). Which seems to tell me there might be an issue with this little devil of a part.
cheers
cheers
Our goal is to make sure you're able to enjoy your truck everyday. If an issue with the switch is still present, it should be addressed.
If you would like, PM me with your VIN# and dealer information, perhaps I can be of more assistance.
Take Care,
Thread Starter
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Veteran
Joined: Apr 2006
Posts: 404
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From: Nova Scotia
sorry for not getting back to you. Yes truck was fixed on Jan.16th. I posted that on the 16th. It was a brake switch. It has a more audible sound (switch - louder click) than the original. Everything is A-ok
cheers
cheers