Transmission Range Sensor B Circuit (PRNDL Input)
The TCM detects an invalid PRNDL signal pattern from transmission range sensor B. The selected gear position cannot be determined reliably from the B-channel.
Affected components
- Transmission range sensor b
- Wiring harness
- Tcm
Common causes
- High likelihood: Range switch contact array failed
- Medium likelihood: Open or short in PRNDL wiring
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.