B12E0 MERCURY Possible Causes
- Faulty Off-Road Mode Switch
- Off-Road Mode Switch harness is open or shorted
- Off-Road Mode Switch circuit poor electrical connection
- Faulty Transfer Case Control Module (TCCM)
First diagnose B12E0 MERCURY code
Check 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 terminals.
B12E0 MERCURY Tech NotesB12E0:11 Off Road Indicator Circuit Short to Ground
B12E0:12 Off Road Indicator Circuit Short to Battery
B12E0:13 Off Road Indicator Circuit Open
Cost of diagnosing the B12E0 MERCURY code
Labor: 1.0The cost of diagnosing the B12E0 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
B12E0 MERCURY Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B12E0 MERCURY MeaningWhen the off-road switch is depressed, a signal is sent to the Transfer Case Control Module (TCCM) which alerts other modules along the HS-CAN that off-road mode is being requested. Other vehicle functions change to accommodate off-road mode and an indicator illuminates on the Off-Road Mode Switch confirming off-road mode. The OBDII code sets when in Off-Road Mode, the TCCM senses the indicator lamp circuit is not to factory specifications.
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