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2011
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300 Base, Gas
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Repair and Diagnosis
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External Pages
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Different car
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Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis)
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Diagnosis and Testing
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U0121-Lost Communication With Anti-Lock Brake Module
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Code Description
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Possible Causes
Possible Causes
WARNING:
This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
CAN C BUS OPEN OR SHORTED CONDITION
ABS MODULE
TOTALLY INTEGRATED POWER MODULE (TIPM)
POWERTRAIN CONTROL MODULE (PCM)