P1915
Internal Mode Switch Does Not Indicate Park/Neutral During Start
What it means
P1915. Internal Mode Switch Does Not Indicate Park/Neutral During Start. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban, Impala.
Findings, check these first
- Faulty internal mode switch not reporting Park or Neutral at crank
- Misadjusted shift cable
- Open or short in the IMS or dedicated Park/Neutral signal circuit
- Metallic debris on control solenoid valve assembly pins
- Faulty control solenoid with body and TCM valve assembly
Standard procedure
- Capture freeze frame data and observe IMS states at crank with a Tech2 scan tool
- Verify shift cable adjustment and ECM Park/Neutral parameter
- Test the IMS and Park/Neutral signal circuits for opens and shorts
- Inspect the control solenoid valve assembly pins for metallic debris
- Replace the IMS or control solenoid valve assembly based on test results
Look up another code
Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.
Sources and review
Review: no source links are recorded for this entry.
Last updated 2026-09-13.
Report a correction for P1915. Include your vehicle, the issue and a source if you have one.