Code
P1560
HUMMER
P — Powertrain
Transaxle Not in Drive - Cruise Control Disabled
Views:
UK: 14
EN: 30
RU: 27
AI status
Completed
Completed
100%
Causes
- Faulty transmission range sensor (PRNDL/gear position switch)
- Damaged or corroded wiring/connectors between range sensor and PCM/TCM
- Misadjusted or binding shift linkage/cable
- Faulty PCM/TCM or cruise control module input
- Blown fuse or faulty relay affecting transmission or cruise circuits
- Intermittent CAN bus or module communication error
Symptoms
- Cruise control will not set or engage
- Cruise control disabled message or indicator illuminated
- Gear selector position indicator not matching actual gear or not indicating Drive
- Possible transmission-related fault codes present
- Vehicle may refuse to go into/recognize Drive or behaves intermittently
What to check
- Read all stored DTCs from PCM and TCM and note freeze frame data
- Verify instrument cluster gear position indicator matches shifter position
- Visually inspect wiring and connectors at the transmission range sensor and modules for damage, corrosion, or looseness
- Check relevant fuses and relays for the transmission and cruise circuits
- Scan live data: monitor gear position / PRNDL status while moving the shift lever through positions
- Check for CAN bus/communication errors between PCM and TCM
Signal parameters
- Transmission range (PRNDL) switch output: typically a multi-position sensor reporting discrete voltages or bits (0–5 V range) or digital CAN messages; values are vehicle-specific
- Expected PCM/TCM gear status: 'Drive' bit or message present when shifter in Drive
- Continuity/ohms across PRNDL switch positions should change according to service manual
- No CEL or other transmission faults that would force limp/cruise disable (verify with scanner)
Diagnostic algorithm
- Retrieve all diagnostic trouble codes from the PCM and TCM; record freeze frame and pending codes.
- Verify the customer's complaint by attempting to engage cruise with vehicle safely parked and then driving; note any messages or indicators.
- Observe the instrument cluster gear position display while moving the shifter through Park–Reverse–Neutral–Drive; confirm the displayed position follows the shifter.
- Use a scan tool to monitor the transmission range input or gear status PID while moving selector; confirm the PCM/TCM receives a 'Drive' indication when in Drive.
- Inspect and back-probe the transmission range sensor connector: check for reference voltage, signal voltage changes, and proper ground per vehicle service data.
- Inspect wiring harness and connectors for damage, corrosion, pin push-out, or water intrusion; repair as needed and re-test signal.
- If wiring and connector good but signal incorrect, replace or bench-test the transmission range sensor per factory procedure.
- Verify shift linkage/cable adjustment and free movement; correct any binding or misadjustment and re-check gear reporting.
- Check for related transmission fault codes; if present, diagnose and repair those faults as they may prevent proper gear reporting.
- If electrical and mechanical checks pass but module still not receiving correct input, check vehicle communication (CAN) and verify PCM/TCM operation; reprogram or replace module only after confirming root cause.
- Clear codes and verify repair by road testing and confirming cruise function restoration when safe and appropriate.
Likely causes
- Transmission range (PRNDL) sensor failure or incorrect signal
- Shift linkage out of adjustment or binding
- Wiring/connectors to the range sensor are open, shorted, or corroded
- PCM/TCM not seeing or interpreting the gear position due to communication fault
Fault status
Status
Cruise control disabled: transaxle not detected in Drive. Check transmission/gear position inputs and related wiring or modules.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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