code U1421 what does this mean?
U1421 what does this mean??
The fourth generation Dodge Ram was introduced at the 2008 North American International Auto Show in Detroit.
The code found is U1421 implausible ignition key off time received. Your truck has a key cycle counter that runs even when the truck is off. It will tell the TIPM or ECM the time when it goes to start. That code indicates typically an invalid time response. This should not be a critical code. Here is the actual test for the code. Note: it requires the factory scanner to check it and the other control modules for any other possible codes:
For a complete wiring diagram Refer to Section 8W.
CAN B OPEN OR SHORTED
FCM (TOTALLY INTEGRATED POWER MODULE)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Theory of Operation
The Totally Integrated Power Module (TIPM) isn't receiving a fuel volume signal over CAN B from the Cluster Module. The TIPM has to send the PCM a fuel volume signal over CAN C. The signal the TIPM sends over CAN C is implausible.
1. ACTIVE DTC
Ignition on, engine not running.
With a scan tool read DTCs.
Is the DTC active at this time?
2. CAN B BUS HARDWARE DTCS ALSO ACTIVE
With a scan tool check for DTCs in the TIPM.
Are any CAN B Hardware related DTCs active at this time?
As you can see you will need the right scanner etc. so this may actually be better serviced at a repair center that has the right tools.
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