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ELECTRONIC SHIFT MODULE – FAULT CODE LIST
If your unit does not shift properly, the ESM will let you know there is a problem using the following table of
fault codes. Once you select a gear, the instrument panel will illuminate a gear light, or a combination of
gear lights. These lights can be used to determine if the vehicle shifted properly, or if there is a shifting
issue. The letter on the far left represents the gear the vehicle was in prior to shifting:
NOTE: To determine the failure mode, it is necessary to remember the original state of the transmission
gear, the gear that was selected, and the state of the indicator lights.
* - Indicates the lights will flash for 5 seconds and an audible tone will sound. During that time a shift will not
be allowed by the ESM. Once the lights stop flashing the ESM will allow for shifting.
Example – The vehicle was in reverse (look at row starting with “R”). The gear selected was forward (look at
“F” in “Gear Selected” row). The “Light Code” flashed on the instrument panel is “RF”, which corresponds
with “Fault code 3”. Looking up “code 3” in the “Fault Codes Defined” section will list the potential problems.
If the solution is not obvious, contact your dealer for service.
Terms and Definitions
• ESM – Electronic Shift Module
• Neutral Sensor – in the neutral position the sensor is normally closed (NC).
• Shifting Wedge – this is a wedge shaped mechanical part that actuates the Neutral Sensor
depending on the gear selected. The void portion of the wedge is neutral.
• Closed Circuit Failure – the Neutral Sensor will stay in the NC, neutral state when engaged in
forward/reverse. This will occur if the shifting wedge is not contacting the Neutral Sensor properly.
• Open Circuit Failure – the Neutral Sensor will stay in the NO, non-neutral state even when it passes
through the void in the shifting wedge. This will occur if the ball actuator of the sensor is stuck inside
the sensor housing or if the wires leading to the sensor are cut/disconnected.
Gear Selected N F
R Light Code N FN* FNR* F RF*
Fault Code None 2 4 None 3
Gear Selected N R
F Light Code N RN* FNR* R RF*
Fault Code None 1 4 None 3
Gear Selected R F
N Light Code R RN* F FN*
Fault Code None 1 None 2
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