What Does P1814 Mean?
DTC P1814 indicates the 4-wheel drive mode select circuit has a short to battery voltage. The mode select switch or its wiring is feeding unwanted voltage to the TCCM, potentially causing the module to misinterpret driver commands. This could result in unwanted transfer case shifts or an inability to change 4WD modes.
Common Causes
30%
Mode select switch wiring shorted to a power source
25%
Failed 4WD mode select switch (stuck or shorted)
20%
Corroded connector at the mode switch or TCCM
15%
Aftermarket switch or wiring modification feeding voltage
10%
TCCM internal input circuit fault
Diagnostic Steps
1
Disconnect the 4WD mode select switch and check if the fault condition clears; if so, the switch is likely shorted internally.
2
With the switch disconnected, check for voltage on the signal wire at the TCCM; voltage present means a harness short to power.
3
Inspect the mode switch connector and wiring for damage, especially behind the dash where the switch is mounted.
4
Test the mode select switch with an ohmmeter in each position; compare readings to manufacturer specifications.
5
Check for any aftermarket modifications near the 4WD controls that may feed voltage into the circuit.
Estimated Repair Cost
$80 - $500
Parts + labor, varies by vehicle and location
DTC P1814 indicates the 4-wheel drive mode select circuit has a short to battery voltage. The mode select switch or its wiring is feeding unwanted voltage to the TCCM, potentially causing the module to misinterpret driver commands. This could result in unwanted transfer case shifts or an inability t...
The most common cause of P1814 (Transmission 4-Wheel Drive Mode Select Short Circuit To Battery) is: Mode select switch wiring shorted to a power source
Typical repair costs for P1814 range from $80 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short to battery on the mode select circuit could cause unintended transfer case engagement or disengagement while driving, potentially affecting vehicle stability, especially at highway speeds.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1814 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transfer Case / 4WD System
Difficulty
Type
Manufacturer
Recommended Tools
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