Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM2006MAGNUM V6-2.7L VIN TREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONU CODE CHARTSU0121TRANSMISSION CONTROL SYSTEM
2006 Dodge and Ram Magnum V6-2.7L VIN T
Transmission Control System
2006 Dodge and Ram Magnum V6-2.7L VIN TSECTION Transmission Control System
U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE - SLA
Theory of Operation
Some controllers communicate with other controllers over the CAN C bus. The ABS controller continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller.
RENDER: 1.0x
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Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.