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.
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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (HYBRID ENGINE CONTROLS - DTC P181C TO DTC P2797)DTC P183FTYPICAL SCAN TOOL DATA
2009 Chevrolet Tahoe Base, 4.8 C
Typical Scan Tool Data
2009 Chevrolet Tahoe Base, 4.8 CSECTION Typical Scan Tool Data
WARNING: This page is about a different variant/trim than selected.
Internal Mode Switch (IMS)
| IMS Circuits/Parameter | Selector Position | ||||
|---|---|---|---|---|---|
| Park | Reverse | Neutral | Drive | Manual | |
| Direction Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| Direction IMS D1 | HIGH | HIGH | LOW | LOW | LOW |
| Direction IMS D2 | LOW | LOW | HIGH | HIGH | HIGH |
| Direction IMS R1 | HIGH | LOW | LOW | HIGH | HIGH |
| Direction IMS R2 | LOW | HIGH | HIGH | LOW | LOW |
| Direction IMS Start | LOW | HIGH | LOW | HIGH | HIGH |
| Range Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| IMS A | LOW | LOW | HI | HI | HI |
| IMS B | HI | LOW | LOW | LOW | HI |
| IMS C | HI | HI | HI | LOW | LOW |
| IMS P | LOW | HI | LOW | HI | LOW |
| Always HIGH status: Open/short to voltage condition Always LOW status: Short to ground condition Every status HIGH for either switch indicates an open ground circuit or connector for that portion of the IMS. |
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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.