P0958
PowertrainTransmission Shiftmoderate severityAuto Shift Manual Mode Circuit High
What P0958 Means
The automatic shift manual mode circuit is reading a higher than expected voltage. This typically points to a short to voltage or an open circuit condition.
Symptoms
- Manual mode inoperative
- Erratic shift behavior
- Transmission warning light on
Common Causes
- Short to voltage in wiring
- Open circuit in mode control line
- Faulty mode selector switch
- Failed transmission control module
Diagnostic Steps
- Scan for related codes
- Measure signal voltage at the circuit
- Check wiring for shorts to power or opens
- Verify switch and TCM function
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