Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Symptom Chart-- External Controls
In most circumstances, the PCM/ TCM and/or the BCM will set a DTC to help guide with diagnostics. Refer to the DTC Chart before using the symptom chart. The Condition column lists the vehicle condition. The Action column refers to a pinpoint test. Each pinpoint test lists the possible sources of the concern in order of disassembly.
Symptom Chart -- External Controls
| Condition | Action |
|---|---|
| Brake shift interlock system does not release/lock correctly | GO to Pinpoint Test A |
| The PRNDL display does not correspond to the selected gear | GO to Pinpoint Test D |
| The PRNDL indicator is always on or never on | GO to Pinpoint Test E |
| The tow/haul switch is not operating correctly | GO to Pinpoint Test B |
| The SelectShift™ switch is not operating correctly | GO to Pinpoint Test C |
| Water enters inside the vehicle | GO to Pinpoint Test F |
| Excessive selector lever effort | GO to Pinpoint Test G |
| The transmission does not change ranges with the selector lever | GO to Pinpoint Test H |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.