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 P1B03 OR P1B04INTERMITTENT CONDITION TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Intermittent Condition Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Intermittent Condition Testing
WARNING: This page is about a different variant/trim than selected.
- If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.
- Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the applicable harness and connectors.
- If any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.
- Disconnect transmission X176 connector and inspect for the following:
- Proper terminal contact
- Proper terminal retention in the connector
- Foreign material or moisture
- Repair, replace or clean the connector as appropriate.
- Reconnect all connectors and test drive the vehicle.
- If the DTC sets, replace the applicable drive motor generator and retest for DTCs. If the DTC sets, replace the PIM.
Drive Motor 1 Position Sensor Specification
| When Testing at PIM X1 56-way Connector/Terminal | When Testing at Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Test at DT-48493 connected to transmission. See Special Tools . | |||
| 55-56 | 8-9 | 7 ohms | 9 ohms |
| 53-54 | 10-11 | 23 ohms | 26 ohms |
| 51-52 | 12-14 | 20 ohms | 23 ohms |
| 52-56 | 8-12 | Over 1 M ohm | - |
| 54-56 | 8-10 | Over 1 M ohm | - |
| 52-54 | 10-12 | Over 1 M ohm | - |
Drive Motor Position Sensor 1 PIM to Transmission Terminal Reference
| PIM Connector X1 56-way Connector/Terminal | Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Harness Continuity Test | |||
| 56 | 8 | - | less than 1 ohm |
| 55 | 9 | - | less than 1 ohm |
| 54 | 10 | - | less than 1 ohm |
| 53 | 11 | - | less than 1 ohm |
| 52 | 12 | - | less than 1 ohm |
| 51 | 14 | - | less than 1 ohm |
Drive Motor 2 Position Sensor Specification
| When Testing at PIM X1 56-way Connector/Terminal | When Testing at Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Test at DT-48493 connected to transmission. See Special Tools . | |||
| 48-49 | 15-16 | 7 ohms | 9 ohms |
| 46-47 | 17-18 | 23 ohms | 26 ohms |
| 44-45 | 20-21 | 20 ohms | 23 ohms |
| 45-49 | 15-20 | Over 1 M ohm | - |
| 47-49 | 15-17 | Over 1 M ohm | - |
| 45-47 | 17-20 | Over 1 M ohm | - |
Drive Motor 2 Position Sensor PIM to Transmission Terminal Reference
| PIM X1 56-way Connector/Terminal | Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Harness Continuity Test | |||
| 49 | 15 | - | less than 1 ohm |
| 48 | 16 | - | less than 1 ohm |
| 47 | 17 | - | less than 1 ohm |
| 46 | 18 | - | less than 1 ohm |
| 45 | 20 | - | less than 1 ohm |
| 44 | 21 | - | less than 1 ohm |
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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.