U1420 - Implausible Electronic Gear Select Signal Received
U1420 Possible Causes
- Faulty Electronic Shift Module (ESM)
- Electronic Shift Module (ESM) harness is open or shorted
- Electronic Shift Module (ESM) circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
- Faulty Transmission Control Module (TCM)
How is the U1420 code repair?Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
What is the cost to diagnose the U1420 code
Labor: 1.0The cost to diagnose the U1420 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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- Engine Light ON (or Service Engine Soon Warning Light)
U1420 MeaningThis diagnostic checks for the validity and availability of the Shift Lever Position signal which is sent by the Electronic Shift Module (ESM) via a CAN message. A CAN signal state is defined for each of five stable lever positions: 'Park', 'Reverse', 'Neutral', 'Drive' and 'Autostick'. CAN signal states are defined for six non-stable positions: 'Up', 'Down', 'P-R', 'R-N', 'N-D' and 'D-A'. The diagnostic checks the validity by verifying the received CAN signal state corresponds to one of the possible lever positions. The diagnostic also checks the availability by verifying the valid bit. When the Shift Lever Position signal is invalid or missing, then the Diagnostic Trouble Code (DTC) U1420 will set. The failure is detected if at least one of the following malfunctions is verified: 1) Signal Not Available Check: When the signal is not available, the ESM sends an SNA default value. If the TCM reads this value, then DTC U1420 is set. 2) Signal Invalid Value Check: If the signal value is equal to a different value than the defined values for the lever position, the Shift Lever Position value is considered not valid, then DTC U1420 is set.
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